vault backup: 2024-01-21 00:27:23

.obsidian/workspace.json

@@ -175,27 +175,29 @@
       "switcher:Open quick switcher": false
     }
   },
-  "active": "671043c113c40804",
+  "active": "13f4c5e19c9ab3c8",
   "lastOpenFiles": [
+    "Semester 2/Programming 2/Week 1/java-apps/HelloWorld/HelloWorldApp.class",
+    "Semester 2/Programming 2/Week 1/java-apps/HelloWorld/start.sh",
+    "Semester 2/Programming 2/Week 1/java-apps/HelloWorld/HelloWorldApp.java",
+    "Semester 2/Programming 2/Week 1/java-apps/HelloWorld",
+    "Semester 2/Programming 2/Week 1/java-apps",
+    "Semester 2/Programming 2/Week 1/zoo-io-v3/ZooApp.java#",
+    "Semester 2/Programming 2/Week 1/zoo-io-v3/__SHELL31.class",
+    "Semester 2/Programming 2/Week 1/zoo-io-v3/__SHELL31$1.class",
+    "Semester 2/Programming 2/Week 1/zoo-io-v3/__SHELL31.java",
+    "Semester 2/Programming 2/Week 1/zoo-io-v3/__SHELL30.class",
+    "Semester 2/Programming 2/Week 1/zoo-io-v3/__SHELL30$1.class",
+    "Semester 2/Computer Systems Internals & Linux/Week 1/workshop/testdir/test.md",
+    "Semester 2/Computer Systems Internals & Linux/Week 1/Week 1 Computer Systems Internals.md",
     "Semester 1/Database Systems/Week 11/Week 11 Database Systems.md",
     "Semester 1/Database Systems/Week 10/Week 10 Database Systems.md",
     "Semester 2/Database Systems/Week 1/Week 1 Database Systems.md",
     "Semester 1/Database Systems/Assignment/Querying Database.md",
-    "Semester 2/Database Systems/Week 1",
-    "Semester 2/Computer Systems Internals & Linux/Week 1/Week 1 Computer Systems Internals.md",
-    "Semester 2/Database Systems",
     "README.md",
     "Semester 2/Programming 2/Week 1/Week 1 Programming 2.md",
-    "Semester 2/Computer Systems Internals & Linux/Week 1",
-    "Semester 2/Programming 2/Week 1",
-    "Semester 2/Computer Systems Internals & Linux",
-    "Semester 2/Programming 2",
-    "Semester 2",
-    "Semester 1",
     "2023-10-31.md",
     "2024-01-15.md",
-    "Semester 1/Web Development and HCI/Assignment.odt",
-    "Web Development and HCI/lu11370hmnm.tmp",
     "Semester 1/Web Development and HCI/Assignment 1/src/images/proxmox-03.jpg",
     "Semester 1/Web Development and HCI/Assignment 1/src/images/proxmox-04.jpg",
     "Web Development and HCI/Assignment 1/src/images/Screenshot from 2023-12-07 18-29-51.png",
@@ -221,7 +223,6 @@
     "Semester 1/Computer Systems Internals & Linux/Coursework 1/Task 5.md",
     "Semester 1/Computer Systems Internals & Linux/Coursework 1/Task 3.md",
     "Semester 1/Computer Systems Internals & Linux/Coursework 1/Task 1.md",
-    "Semester 1/Computer Systems Internals & Linux/Coursework 1/Task 2.md",
     "Database Systems/Untitled.canvas",
     "Untitled 1.canvas",
     "Untitled.canvas"

Semester 2/Computer Systems Internals & Linux/Week 1/workshop/delete.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+if [ $# -eq 1 ] && [ -f $1 ]; then
+	mv $1 ./wastebasket/$1
+	echo "file $1 moved to ./wastebasket/$1"
+elif [ $# -eq 1] && [ -d $1 ]; then
+	mv -R $1 ./wastebasket/$1
+	echo "directory $1 moved to ./wastebasket/$1"
+else
+	echo "More than one file supplied"
+fi

Semester 2/Computer Systems Internals & Linux/Week 1/workshop/script1.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+echo -n Enter num:
+read num
+if [ "$num" = "" ]; then
+	echo No input
+elif echo $num | grep -Eq '[^0-9]'; then
+	echo Not an integer
+elif [ $num -gt 5 ]; then
+	echo Greater than 5
+elif [ $num -eq 5 ]; then
+	echo Equal to 5
+else
+	echo Less than 5
+fi

Semester 2/Computer Systems Internals & Linux/Week 1/workshop/script2.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+for file in ~/*; do #For every item in the user's home directory.
+	if [ -d "$file" ]; then
+		echo $file is a directory
+	elif [ -f "$file" ]; then
+		lines=$(cat "$file" | wc -l)
+		echo $file is a file with $lines lines
+	fi
+done

Semester 2/Computer Systems Internals & Linux/Week 1/workshop/script3.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+if [ $# -eq 2 ]; then
+	echo "2 arguments (\"$1\" and \"$2\")"
+else
+	echo Please give me 2 arguments
+fi

Semester 2/Database Systems/Week 1/Week 1 Database Systems.md

@@ -1,7 +1,10 @@
-### [Relational Algebra - Recap](obsidian://open?vault=Computer%20Science%20Year%201&file=Semester%201%2FDatabase%20Systems%2FWeek%2010%2FWeek%2010)
+### [Relational Algebra - Recap](obsidian://open?vault=Computer%20Science%20Year%201&file=Semester%201%2FDatabase%20Systems%2FWeek%2010%2FWeek%2010%20Database%20Systems)
 
 - High level & procedural
 - Defines how to build relations
+- SELECT represented by pi ( projection )
+- FROM represented by sigma ( selection )
+- WHERE represented by x ( cartesian product )
 
 #### Data Manipulation Language
 
@@ -14,3 +17,21 @@
 - Operations work on one or more relations to define another relation without changing the original
 - Both operands and results are relations, output from one operation can become the input for another operation.
 - This allows nested expressions.
+
+#### Theta Join
+
+R theta(f) S defines a relation that contains tuples satisfying F from the Cartesian product of two relations R and S.
+Takes the Cartesian product of two relations r and s than selects the rows which satisfy the condition F.
+R theta(f) S is the same as sigma(f) (R x S ).
+F may contain comparison operators to form a condition.
+
+#### Query Processing
+The activities involved in parsing, validating, optimising and executing a query.
+Purpose is to transform a query written in a high level language into correct and efficient strategy in low level language. Also to execute strategy to retrieve data.
+
+#### Common Optimisation Rules
+- Begin with initial query tree for SQL
+- Move SELECT operations down the tree
+- Apply more restrictive SELECT operations first ( eg. equalities before range queries )
+- Replace Cartesian products followed by selection with theta joins ( eg. *sigma(f) ( RxS )* -> *R theta(f) S* )
+- Move PROJECT operations down the query tree ( add project operations as inputs to theta joins )

Semester 2/Programming 2/Week 1/java-apps/HelloWorld/HelloWorldApp.java

@@ -0,0 +1,13 @@
+/**
+ * The stand-alone HelloWorld application.
+ *
+ * @author (D.Evans
+ * @version 10/02/2004
+ */
+public class HelloWorldApp
+{
+    public static void main(String[] args)
+    {
+        System.out.println("Hello World!");
+    }
+}

Semester 2/Programming 2/Week 1/java-apps/HelloWorld/start.sh

@@ -0,0 +1,2 @@
+javac ./HelloWorldApp.java
+java HelloWorldApp

Semester 2/Programming 2/Week 1/workshop/package.bluej

@@ -0,0 +1,40 @@
+#BlueJ package file
+dependency1.from=Zoo
+dependency1.to=Animal
+dependency1.type=UsesDependency
+objectbench.height=76
+objectbench.width=852
+package.editor.height=400
+package.editor.width=726
+package.editor.x=754
+package.editor.y=257
+package.numDependencies=1
+package.numTargets=2
+package.showExtends=true
+package.showUses=true
+project.charset=UTF-8
+target1.editor.height=700
+target1.editor.width=900
+target1.editor.x=70
+target1.editor.y=51
+target1.height=50
+target1.name=Animal
+target1.showInterface=false
+target1.type=ClassTarget
+target1.typeParameters=
+target1.width=80
+target1.x=70
+target1.y=10
+target2.editor.height=700
+target2.editor.width=900
+target2.editor.x=350
+target2.editor.y=130
+target2.height=50
+target2.name=Zoo
+target2.naviview.expanded=true
+target2.showInterface=false
+target2.type=ClassTarget
+target2.typeParameters=
+target2.width=80
+target2.x=150
+target2.y=60

Semester 2/Programming 2/Week 1/zoo-io-v1/Animal.ctxt

@@ -0,0 +1,14 @@
+#BlueJ class context
+comment0.params=species\ name
+comment0.target=Animal(java.lang.String,\ java.lang.String)
+comment0.text=\n\ Create\ an\ animal\ of\ the\ specified\ species\ and\ with\ the\ specified\ name\n\ \n\ @param\ \ <code>species</code>\ a\ <code>String</code>\ specifying\ the\n\ type\ of\ animal\n\ @param\ \ <code>name</code>\ a\ <code>String</code>\ specifying\ the\ \n\ name\ of\ animal\n
+comment1.params=
+comment1.target=java.lang.String\ getSpecies()
+comment1.text=\n\ Returns\ the\ species\ of\ the\ <code>Animal</code>\ object\n\ \n\ @return\ \ \ the\ species\ of\ animal,\ as\ a\ <code>String</code>\n
+comment2.params=
+comment2.target=java.lang.String\ getName()
+comment2.text=\n\ Returns\ the\ name\ of\ the\ <code>Animal</code>\ object\n\ \n\ @return\ \ \ the\ name\ of\ animal,\ as\ a\ <code>String</code>\n
+comment3.params=
+comment3.target=java.lang.String\ toString()
+comment3.text=\n\ Returns\ a\ string\ representing\ the\ <code>Animal</code>\ object.\ \ For\ a\ \n\ lion\ with\ name\ Leo\ it\ will\ return\ the\ <code>String</code>\ "Leo,\ a\ lion"\n\ \n\ @return\ \ \ a\ <code>String</code>\ representation\ of\ the\ animal\n
+numComments=4

Semester 2/Programming 2/Week 1/zoo-io-v1/Animal.java

@@ -0,0 +1,59 @@
+/**
+ * class <code>Animal</code> simulates an animal and stores 
+ * the species and name.
+ * 
+ * @author D Newton 
+ * @version Version 1, 1 November 2010
+ */
+public class Animal
+{
+   // species of the animal e.g.  lion, tiger
+   private String species;
+   // name of the animal e.g. Leo, Tommy
+   private String name;
+   
+   /**
+    * Create an animal of the specified species and with the specified name
+    * 
+    * @param  <code>species</code> a <code>String</code> specifying the
+    * type of animal
+    * @param  <code>name</code> a <code>String</code> specifying the 
+    * name of animal
+    */
+   public Animal(String species, String name)
+   {
+      this.species = species;
+      this.name  = name;
+   }
+   
+   /**
+    * Returns the species of the <code>Animal</code> object
+    * 
+    * @return   the species of animal, as a <code>String</code>
+    */
+   public String getSpecies()
+   {
+      return species;
+   }
+   
+   /**
+    * Returns the name of the <code>Animal</code> object
+    * 
+    * @return   the name of animal, as a <code>String</code>
+    */
+   public String getName()
+   {
+      return name;
+   }
+   
+   /**
+    * Returns a string representing the <code>Animal</code> object.  For a 
+    * lion with name Leo it will return the <code>String</code> "Leo, a lion"
+    * 
+    * @return   a <code>String</code> representation of the animal
+    */
+   public String toString()
+   {
+      return name + ", a " + species;
+   }
+}

Semester 2/Programming 2/Week 1/zoo-io-v1/README.TXT

@@ -0,0 +1,12 @@
+------------------------------------------------------------------------
+This is the project README file. Here, you should describe your project.
+Tell the reader (someone who does not know anything about this project)
+all he/she needs to know. The comments should usually include at least:
+------------------------------------------------------------------------
+
+PROJECT TITLE:
+PURPOSE OF PROJECT:
+VERSION or DATE:
+HOW TO START THIS PROJECT:
+AUTHORS:
+USER INSTRUCTIONS:

Semester 2/Programming 2/Week 1/zoo-io-v1/Zoo.ctxt

@@ -0,0 +1,35 @@
+#BlueJ class context
+comment0.params=
+comment0.target=Zoo()
+comment0.text=\n\ Create\ an\ "empty"\ zoo\n
+comment1.params=fileName
+comment1.target=Zoo(java.lang.String)
+comment1.text=\n\ Create\ a\ zoo\ and\ populate\ it\ using\ data\ from\ a\ text\ file\n
+comment10.params=fileName
+comment10.target=void\ readAnimalData(java.lang.String)
+comment10.text=\n\ Reads\ animal\ data\ from\ a\ file\ and\ adds\ corresponding\ animals\ to\ the\ zoo\n\n\ @param\ \ \ <code>fileName</code>\ a\ <code>String</code>,\ the\ name\ of\ the\ \n\ \ \ \ \ \ \ \ \ \ text\ file\ in\ which\ the\ data\ is\ stored.\n\ \n\ @throws\ \ FileNotFoundException\n
+comment2.params=animal
+comment2.target=void\ storeAnimal(Animal)
+comment2.text=\n\ Adds\ an\ animal\ to\ the\ zoo\n\n\ @param\ \ \ <code>animal</code>\ an\ <code>Animal</code>\ object,\ the\ animal\ to\ be\ added\n
+comment3.params=listPosition
+comment3.target=void\ showAnimal(int)
+comment3.text=\n\ Shows\ an\ animal\ by\ printing\ it's\ details.\ \ This\ includes\n\ it's\ position\ in\ the\ collection.\n\n\ @param\ \ <code>listPosition</code>\ the\ position\ of\ the\ animal\n
+comment4.params=
+comment4.target=int\ numberOfAnimals()
+comment4.text=\n\ Returns\ how\ many\ animals\ are\ stored\ in\ the\ collection\n\n\ @return\ \ \ the\ number\ of\ animals\ in\ the\ collection\n
+comment5.params=
+comment5.target=void\ showAllAnimals()
+comment5.text=\n\ Displays\ all\ the\ animals\ in\ the\ collection\n\n
+comment6.params=listPosition
+comment6.target=void\ removeAnimal(int)
+comment6.text=\n\ Remove\ an\ animal\ from\ the\ collection\n\n\ @param\ \ <code>listPosition</code>\ the\ position\ of\ the\ animal\n
+comment7.params=
+comment7.target=void\ populate()
+comment7.text=\n\ Adds\ a\ pre-defined\ set\ of\ animals\ to\ the\ current\ collection\n\n
+comment8.params=
+comment8.target=void\ countAnimals()
+comment8.text=\n\ Counts\ the\ number\ of\ lions,\ tigers\ and\ elephants\n\n
+comment9.params=fileName
+comment9.target=void\ writeAnimalData(java.lang.String)
+comment9.text=\n\ Writes\ animal\ data\ to\ a\ file\n\n\ @param\ \ \ <code>fileName</code>\ a\ <code>String</code>,\ the\ name\ of\ the\ \n\ \ \ \ \ \ \ \ \ \ text\ file\ in\ which\ the\ data\ will\ be\ stored.\n\ \n\ @throws\ \ FileNotFoundException\n
+numComments=11

Semester 2/Programming 2/Week 1/zoo-io-v1/Zoo.java

@@ -0,0 +1,192 @@
+import java.util.*;
+import java.io.*;
+/**
+ * class <code>Zoo</code> simulates storing animals in a collection.
+ *
+ * @author D Newton
+ * */
+public class Zoo
+{
+   private ArrayList<Animal> animalCollection;
+   private int lionCount;
+   private int tigerCount;
+   private int elephantCount;
+   private int otherCount;
+
+   /**
+    * Create an "empty" zoo
+    */
+   public Zoo()
+   {
+      animalCollection = new ArrayList<Animal>();
+      lionCount = 0;
+      tigerCount = 0;
+      elephantCount = 0;
+      otherCount = 0;
+   }
+
+   /**
+    * Create a zoo and populate it using data from a text file
+    */
+   public Zoo(String fileName) throws FileNotFoundException
+   {
+      this();
+      readAnimalData(fileName);
+   }
+   
+   /**
+    * Adds an animal to the zoo
+    *
+    * @param   <code>animal</code> an <code>Animal</code> object, the animal to be added
+    */
+   public void storeAnimal(Animal animal)
+   {
+      animalCollection.add(animal);
+   }
+
+   /**
+    * Shows an animal by printing it's details.  This includes
+    * it's position in the collection.
+    *
+    * @param  <code>listPosition</code> the position of the animal
+    */
+   public void showAnimal(int listPosition)
+   {
+      Animal animal;
+      if( listPosition < animalCollection.size() )
+      {
+         animal = animalCollection.get(listPosition);
+         System.out.println("Position " + listPosition  + ": " + animal);
+      }
+   }
+
+   /**
+    * Returns how many animals are stored in the collection
+    *
+    * @return   the number of animals in the collection
+    */
+   public int numberOfAnimals()
+   {
+      return animalCollection.size();
+   }
+
+   /**
+    * Displays all the animals in the collection
+    *
+    */
+   public void showAllAnimals()
+   {
+      System.out.println("Zoo");
+      System.out.println("===");
+
+      int listPosition = 0;
+      while( listPosition<animalCollection.size() )
+      {
+         showAnimal(listPosition);
+         listPosition++;
+      }
+      System.out.println(listPosition + " animals shown" );    // display number of animals shown  
+   }
+
+    /**
+    * Remove an animal from the collection
+    *
+    * @param  <code>listPosition</code> the position of the animal
+    */
+   public void removeAnimal(int listPosition)
+   {
+       if( listPosition>=0 && listPosition<animalCollection.size() )
+       {
+          animalCollection.remove(listPosition);
+       }
+       else
+       {
+          System.out.println("Invalid position");
+       }
+   }
+
+  /**
+    * Adds a pre-defined set of animals to the current collection
+    *
+    */
+   public void populate()
+   {
+      storeAnimal( new Animal("lion", "Leo") );
+      storeAnimal( new Animal("tiger", "Tommy") );
+      storeAnimal( new Animal("elephant", "Ollie") );
+      storeAnimal( new Animal("rat", "Roland") );
+      storeAnimal( new Animal("reindeer", "Rudolph") );
+      storeAnimal( new Animal("Lion", "Lenny") );
+      storeAnimal( new Animal("Elephant", "Nellie") );
+      storeAnimal( new Animal("tiger", "Tessa") );
+      storeAnimal( new Animal("eLephant", "Hetty") );
+      storeAnimal( new Animal("LION", "Leslie") );      
+   }
+
+   /**
+    * Counts the number of lions, tigers and elephants
+    *
+    */
+   public void countAnimals( )
+   {
+       lionCount = 0; tigerCount = 0; 
+       elephantCount= 0; otherCount = 0;
+       Iterator<Animal> it = animalCollection.iterator();
+       while( it.hasNext() )
+       {
+           Animal currentAnimal = it.next();
+           String species = currentAnimal.getSpecies();
+           if( species.equalsIgnoreCase("lion") )
+              lionCount++;
+           else if( species.equalsIgnoreCase("tiger") )
+              tigerCount++;
+           else if( species.equalsIgnoreCase("elephant") )
+              elephantCount++;
+           else
+              otherCount++;
+       }
+   }
+
+   /**
+    * Writes animal data to a file
+    *
+    * @param   <code>fileName</code> a <code>String</code>, the name of the 
+    *          text file in which the data will be stored.
+    * 
+    * @throws  FileNotFoundException
+    */
+   public void writeAnimalData(String fileName) throws FileNotFoundException
+   {
+      PrintWriter pWriter = new PrintWriter(fileName);
+      
+      for(Animal a: animalCollection)
+      {
+         String lineOfOutput = a.getName() + " " + a.getSpecies();
+         pWriter.println(lineOfOutput);
+      }
+      pWriter.close();
+   }
+
+   /**
+    * Reads animal data from a file and adds corresponding animals to the zoo
+    *
+    * @param   <code>fileName</code> a <code>String</code>, the name of the 
+    *          text file in which the data is stored.
+    * 
+    * @throws  FileNotFoundException
+    */   
+   public void readAnimalData(String fileName) throws FileNotFoundException
+   {
+	   File dataFile = new File(fileName);
+      Scanner scanner = new Scanner(dataFile);
+
+      while( scanner.hasNext() )
+      {
+         String name = scanner.next();
+         String species = scanner.next();
+         storeAnimal( new Animal(species, name) );
+      }
+      
+      scanner.close();
+   }
+}

Semester 2/Programming 2/Week 1/zoo-io-v1/animal_data.txt

@@ -0,0 +1,10 @@
+Leo lion
+Tommy tiger
+Ollie elephant
+Roland rat
+Rudolph reindeer
+Lenny Lion
+Nellie Elephant
+Tessa tiger
+Hetty eLephant
+Leslie LION

Semester 2/Programming 2/Week 1/zoo-io-v1/new_animals.txt

@@ -0,0 +1,3 @@
+Bobby bear
+Andy aardvark
+Polly parrot

Semester 2/Programming 2/Week 1/zoo-io-v1/package.bluej

@@ -0,0 +1,3 @@
+#BlueJ package file
+#Thu Jan 18 14:27:41 GMT 2024
+project.charset=UTF-8

Semester 2/Programming 2/Week 1/zoo-io-v2/Animal.ctxt

@@ -0,0 +1,14 @@
+#BlueJ class context
+comment0.params=species\ name
+comment0.target=Animal(java.lang.String,\ java.lang.String)
+comment0.text=\n\ Create\ an\ animal\ of\ the\ specified\ species\ and\ with\ the\ specified\ name\n\ \n\ @param\ \ <code>species</code>\ a\ <code>String</code>\ specifying\ the\n\ type\ of\ animal\n\ @param\ \ <code>name</code>\ a\ <code>String</code>\ specifying\ the\ \n\ name\ of\ animal\n
+comment1.params=
+comment1.target=java.lang.String\ getSpecies()
+comment1.text=\n\ Returns\ the\ species\ of\ the\ <code>Animal</code>\ object\n\ \n\ @return\ \ \ the\ species\ of\ animal,\ as\ a\ <code>String</code>\n
+comment2.params=
+comment2.target=java.lang.String\ getName()
+comment2.text=\n\ Returns\ the\ name\ of\ the\ <code>Animal</code>\ object\n\ \n\ @return\ \ \ the\ name\ of\ animal,\ as\ a\ <code>String</code>\n
+comment3.params=
+comment3.target=java.lang.String\ toString()
+comment3.text=\n\ Returns\ a\ string\ representing\ the\ <code>Animal</code>\ object.\ \ For\ a\ \n\ lion\ with\ name\ Leo\ it\ will\ return\ the\ <code>String</code>\ "Leo,\ a\ lion"\n\ \n\ @return\ \ \ a\ <code>String</code>\ representation\ of\ the\ animal\n
+numComments=4

Semester 2/Programming 2/Week 1/zoo-io-v2/Animal.java

@@ -0,0 +1,59 @@
+/**
+ * class <code>Animal</code> simulates an animal and stores 
+ * the species and name.
+ * 
+ * @author D Newton 
+ * @version Version 1, 1 November 2010
+ */
+public class Animal
+{
+   // species of the animal e.g.  lion, tiger
+   private String species;
+   // name of the animal e.g. Leo, Tommy
+   private String name;
+   
+   /**
+    * Create an animal of the specified species and with the specified name
+    * 
+    * @param  <code>species</code> a <code>String</code> specifying the
+    * type of animal
+    * @param  <code>name</code> a <code>String</code> specifying the 
+    * name of animal
+    */
+   public Animal(String species, String name)
+   {
+      this.species = species;
+      this.name  = name;
+   }
+   
+   /**
+    * Returns the species of the <code>Animal</code> object
+    * 
+    * @return   the species of animal, as a <code>String</code>
+    */
+   public String getSpecies()
+   {
+      return species;
+   }
+   
+   /**
+    * Returns the name of the <code>Animal</code> object
+    * 
+    * @return   the name of animal, as a <code>String</code>
+    */
+   public String getName()
+   {
+      return name;
+   }
+   
+   /**
+    * Returns a string representing the <code>Animal</code> object.  For a 
+    * lion with name Leo it will return the <code>String</code> "Leo, a lion"
+    * 
+    * @return   a <code>String</code> representation of the animal
+    */
+   public String toString()
+   {
+      return name + ", a " + species;
+   }
+}

Semester 2/Programming 2/Week 1/zoo-io-v2/README.TXT

@@ -0,0 +1,12 @@
+------------------------------------------------------------------------
+This is the project README file. Here, you should describe your project.
+Tell the reader (someone who does not know anything about this project)
+all he/she needs to know. The comments should usually include at least:
+------------------------------------------------------------------------
+
+PROJECT TITLE:
+PURPOSE OF PROJECT:
+VERSION or DATE:
+HOW TO START THIS PROJECT:
+AUTHORS:
+USER INSTRUCTIONS:

Semester 2/Programming 2/Week 1/zoo-io-v2/Zoo.ctxt

@@ -0,0 +1,35 @@
+#BlueJ class context
+comment0.params=
+comment0.target=Zoo()
+comment0.text=\n\ Create\ an\ "empty"\ zoo\n
+comment1.params=fileName
+comment1.target=Zoo(java.lang.String)
+comment1.text=\n\ Create\ a\ zoo\ and\ populate\ it\ using\ data\ from\ a\ text\ file\n
+comment10.params=fileName
+comment10.target=void\ readAnimalData(java.lang.String)
+comment10.text=\n\ Reads\ animal\ data\ from\ a\ file\ and\ adds\ corresponding\ animals\ to\ the\ zoo\n\n\ @param\ \ \ <code>fileName</code>\ a\ <code>String</code>,\ the\ name\ of\ the\ \n\ \ \ \ \ \ \ \ \ \ text\ file\ in\ which\ the\ data\ is\ stored.\n\ \n\ @throws\ \ FileNotFoundException\n
+comment2.params=animal
+comment2.target=void\ storeAnimal(Animal)
+comment2.text=\n\ Adds\ an\ animal\ to\ the\ zoo\n\n\ @param\ \ \ <code>animal</code>\ an\ <code>Animal</code>\ object,\ the\ animal\ to\ be\ added\n
+comment3.params=listPosition
+comment3.target=void\ showAnimal(int)
+comment3.text=\n\ Shows\ an\ animal\ by\ printing\ it's\ details.\ \ This\ includes\n\ it's\ position\ in\ the\ collection.\n\n\ @param\ \ <code>listPosition</code>\ the\ position\ of\ the\ animal\n
+comment4.params=
+comment4.target=int\ numberOfAnimals()
+comment4.text=\n\ Returns\ how\ many\ animals\ are\ stored\ in\ the\ collection\n\n\ @return\ \ \ the\ number\ of\ animals\ in\ the\ collection\n
+comment5.params=
+comment5.target=void\ showAllAnimals()
+comment5.text=\n\ Displays\ all\ the\ animals\ in\ the\ collection\n\n
+comment6.params=listPosition
+comment6.target=void\ removeAnimal(int)
+comment6.text=\n\ Remove\ an\ animal\ from\ the\ collection\n\n\ @param\ \ <code>listPosition</code>\ the\ position\ of\ the\ animal\n
+comment7.params=
+comment7.target=void\ populate()
+comment7.text=\n\ Adds\ a\ pre-defined\ set\ of\ animals\ to\ the\ current\ collection\n\n
+comment8.params=
+comment8.target=void\ countAnimals()
+comment8.text=\n\ Counts\ the\ number\ of\ lions,\ tigers\ and\ elephants\n\n
+comment9.params=fileName
+comment9.target=void\ writeAnimalData(java.lang.String)
+comment9.text=\n\ Writes\ animal\ data\ to\ a\ file\n\n\ @param\ \ \ <code>fileName</code>\ a\ <code>String</code>,\ the\ name\ of\ the\ \n\ \ \ \ \ \ \ \ \ \ text\ file\ in\ which\ the\ data\ will\ be\ stored.\n\ \n\ @throws\ \ FileNotFoundException\n
+numComments=11

Semester 2/Programming 2/Week 1/zoo-io-v2/Zoo.java

@@ -0,0 +1,194 @@
+import java.util.*;
+import java.io.*;
+/**
+ * class <code>Zoo</code> simulates storing animals in a collection.
+ *
+ * @author D Newton
+ * */
+public class Zoo
+{
+   private ArrayList<Animal> animalCollection;
+   private int lionCount;
+   private int tigerCount;
+   private int elephantCount;
+   private int otherCount;
+
+   /**
+    * Create an "empty" zoo
+    */
+   public Zoo()
+   {
+      animalCollection = new ArrayList<Animal>();
+      lionCount = 0;
+      tigerCount = 0;
+      elephantCount = 0;
+      otherCount = 0;
+   }
+
+   /**
+    * Create a zoo and populate it using data from a text file
+    */
+   public Zoo(String fileName) throws FileNotFoundException
+   {
+      this();
+      readAnimalData(fileName);
+   }
+   
+   /**
+    * Adds an animal to the zoo
+    *
+    * @param   <code>animal</code> an <code>Animal</code> object, the animal to be added
+    */
+   public void storeAnimal(Animal animal)
+   {
+      animalCollection.add(animal);
+   }
+
+   /**
+    * Shows an animal by printing it's details.  This includes
+    * it's position in the collection.
+    *
+    * @param  <code>listPosition</code> the position of the animal
+    */
+   public void showAnimal(int listPosition)
+   {
+      Animal animal;
+      if( listPosition < animalCollection.size() )
+      {
+         animal = animalCollection.get(listPosition);
+         System.out.println("Position " + listPosition  + ": " + animal);
+      }
+   }
+
+   /**
+    * Returns how many animals are stored in the collection
+    *
+    * @return   the number of animals in the collection
+    */
+   public int numberOfAnimals()
+   {
+      return animalCollection.size();
+   }
+
+   /**
+    * Displays all the animals in the collection
+    *
+    */
+   public void showAllAnimals()
+   {
+      System.out.println("Zoo");
+      System.out.println("===");
+
+      int listPosition = 0;
+      while( listPosition<animalCollection.size() )
+      {
+         showAnimal(listPosition);
+         listPosition++;
+      }
+      System.out.println(listPosition + " animals shown" );    // display number of animals shown  
+   }
+
+    /**
+    * Remove an animal from the collection
+    *
+    * @param  <code>listPosition</code> the position of the animal
+    */
+   public void removeAnimal(int listPosition)
+   {
+       if( listPosition>=0 && listPosition<animalCollection.size() )
+       {
+          animalCollection.remove(listPosition);
+       }
+       else
+       {
+          System.out.println("Invalid position");
+       }
+   }
+
+  /**
+    * Adds a pre-defined set of animals to the current collection
+    *
+    */
+   public void populate()
+   {
+      storeAnimal( new Animal("lion", "Leo") );
+      storeAnimal( new Animal("tiger", "Tommy") );
+      storeAnimal( new Animal("elephant", "Ollie") );
+      storeAnimal( new Animal("rat", "Roland") );
+      storeAnimal( new Animal("reindeer", "Rudolph") );
+      storeAnimal( new Animal("Lion", "Lenny") );
+      storeAnimal( new Animal("Elephant", "Nellie") );
+      storeAnimal( new Animal("tiger", "Tessa") );
+      storeAnimal( new Animal("eLephant", "Hetty") );
+      storeAnimal( new Animal("LION", "Leslie") );      
+   }
+
+   /**
+    * Counts the number of lions, tigers and elephants
+    *
+    */
+   public void countAnimals( )
+   {
+       lionCount = 0; tigerCount = 0; 
+       elephantCount= 0; otherCount = 0;
+       Iterator<Animal> it = animalCollection.iterator();
+       while( it.hasNext() )
+       {
+           Animal currentAnimal = it.next();
+           String species = currentAnimal.getSpecies();
+           if( species.equalsIgnoreCase("lion") )
+              lionCount++;
+           else if( species.equalsIgnoreCase("tiger") )
+              tigerCount++;
+           else if( species.equalsIgnoreCase("elephant") )
+              elephantCount++;
+           else
+              otherCount++;
+       }
+   }
+
+   /**
+    * Writes animal data to a file
+    *
+    * @param   <code>fileName</code> a <code>String</code>, the name of the 
+    *          text file in which the data will be stored.
+    * 
+    * @throws  FileNotFoundException
+    */
+   public void writeAnimalData(String fileName) throws FileNotFoundException
+   {
+      PrintWriter pWriter = new PrintWriter(fileName);
+      
+      for(Animal a: animalCollection)
+      {
+         String lineOfOutput = a.getName() + "," + a.getSpecies();
+         pWriter.println(lineOfOutput);
+      }
+      pWriter.close();
+   }
+
+   /**
+    * Reads animal data from a file and adds corresponding animals to the zoo
+    *
+    * @param   <code>fileName</code> a <code>String</code>, the name of the 
+    *          text file in which the data is stored.
+    * 
+    * @throws  FileNotFoundException
+    */   
+   public void readAnimalData(String fileName) throws FileNotFoundException
+   {
+	  File dataFile = new File(fileName);
+      Scanner scanner = new Scanner(dataFile);
+      scanner.useDelimiter("[,\n]");
+
+      while( scanner.hasNext() )
+      {
+         String name = scanner.next();
+         name.trim();
+         String species = scanner.next();
+         species.trim();
+         storeAnimal( new Animal(species, name) );
+      }
+      scanner.close();
+   }
+}

Semester 2/Programming 2/Week 1/zoo-io-v2/animal_data.txt

@@ -0,0 +1,10 @@
+Leo, Lion
+Tommy, Tiger
+Ollie, Elephant
+Roland, Rat
+Rudolph, Reindeer
+Lenny, Lion
+Nellie, Elephant
+Tessa, Tiger
+Hetty, Elephant
+Leslie, Lion

Semester 2/Programming 2/Week 1/zoo-io-v2/new_animals.txt

@@ -0,0 +1,3 @@
+Bobby, Bear
+Andy, Aardvark
+Polly, African Grey Parrot

Semester 2/Programming 2/Week 1/zoo-io-v2/package.bluej

@@ -0,0 +1,36 @@
+#BlueJ package file
+dependency1.from=Zoo
+dependency1.to=Animal
+dependency1.type=UsesDependency
+objectbench.height=76
+objectbench.width=686
+package.editor.height=400
+package.editor.width=560
+package.editor.x=774
+package.editor.y=277
+package.numDependencies=1
+package.numTargets=2
+package.showExtends=true
+package.showUses=true
+project.charset=UTF-8
+target1.height=50
+target1.name=Animal
+target1.showInterface=false
+target1.type=ClassTarget
+target1.typeParameters=
+target1.width=80
+target1.x=90
+target1.y=10
+target2.editor.height=700
+target2.editor.width=900
+target2.editor.x=814
+target2.editor.y=297
+target2.height=50
+target2.name=Zoo
+target2.naviview.expanded=true
+target2.showInterface=false
+target2.type=ClassTarget
+target2.typeParameters=
+target2.width=80
+target2.x=180
+target2.y=10

Semester 2/Programming 2/Week 1/zoo-io-v3/Animal.ctxt

@@ -0,0 +1,14 @@
+#BlueJ class context
+comment0.params=species\ name
+comment0.target=Animal(java.lang.String,\ java.lang.String)
+comment0.text=\n\ Create\ an\ animal\ of\ the\ specified\ species\ and\ with\ the\ specified\ name\n\ \n\ @param\ \ <code>species</code>\ a\ <code>String</code>\ specifying\ the\n\ type\ of\ animal\n\ @param\ \ <code>name</code>\ a\ <code>String</code>\ specifying\ the\ \n\ name\ of\ animal\n
+comment1.params=
+comment1.target=java.lang.String\ getSpecies()
+comment1.text=\n\ Returns\ the\ species\ of\ the\ <code>Animal</code>\ object\n\ \n\ @return\ \ \ the\ species\ of\ animal,\ as\ a\ <code>String</code>\n
+comment2.params=
+comment2.target=java.lang.String\ getName()
+comment2.text=\n\ Returns\ the\ name\ of\ the\ <code>Animal</code>\ object\n\ \n\ @return\ \ \ the\ name\ of\ animal,\ as\ a\ <code>String</code>\n
+comment3.params=
+comment3.target=java.lang.String\ toString()
+comment3.text=\n\ Returns\ a\ string\ representing\ the\ <code>Animal</code>\ object.\ \ For\ a\ \n\ lion\ with\ name\ Leo\ it\ will\ return\ the\ <code>String</code>\ "Leo,\ a\ lion"\n\ \n\ @return\ \ \ a\ <code>String</code>\ representation\ of\ the\ animal\n
+numComments=4

Semester 2/Programming 2/Week 1/zoo-io-v3/Animal.java

@@ -0,0 +1,59 @@
+/**
+ * class <code>Animal</code> simulates an animal and stores 
+ * the species and name.
+ * 
+ * @author D Newton 
+ * @version Version 1, 1 November 2010
+ */
+public class Animal
+{
+   // species of the animal e.g.  lion, tiger
+   private String species;
+   // name of the animal e.g. Leo, Tommy
+   private String name;
+   
+   /**
+    * Create an animal of the specified species and with the specified name
+    * 
+    * @param  <code>species</code> a <code>String</code> specifying the
+    * type of animal
+    * @param  <code>name</code> a <code>String</code> specifying the 
+    * name of animal
+    */
+   public Animal(String species, String name)
+   {
+      this.species = species;
+      this.name  = name;
+   }
+   
+   /**
+    * Returns the species of the <code>Animal</code> object
+    * 
+    * @return   the species of animal, as a <code>String</code>
+    */
+   public String getSpecies()
+   {
+      return species;
+   }
+   
+   /**
+    * Returns the name of the <code>Animal</code> object
+    * 
+    * @return   the name of animal, as a <code>String</code>
+    */
+   public String getName()
+   {
+      return name;
+   }
+   
+   /**
+    * Returns a string representing the <code>Animal</code> object.  For a 
+    * lion with name Leo it will return the <code>String</code> "Leo, a lion"
+    * 
+    * @return   a <code>String</code> representation of the animal
+    */
+   public String toString()
+   {
+      return name + ", a " + species;
+   }
+}

Semester 2/Programming 2/Week 1/zoo-io-v3/README.TXT

@@ -0,0 +1,12 @@
+------------------------------------------------------------------------
+This is the project README file. Here, you should describe your project.
+Tell the reader (someone who does not know anything about this project)
+all he/she needs to know. The comments should usually include at least:
+------------------------------------------------------------------------
+
+PROJECT TITLE:
+PURPOSE OF PROJECT:
+VERSION or DATE:
+HOW TO START THIS PROJECT:
+AUTHORS:
+USER INSTRUCTIONS:

Semester 2/Programming 2/Week 1/zoo-io-v3/Zoo.ctxt

@@ -0,0 +1,35 @@
+#BlueJ class context
+comment0.params=
+comment0.target=Zoo()
+comment0.text=\n\ Create\ an\ "empty"\ zoo\n
+comment1.params=fileName
+comment1.target=Zoo(java.lang.String)
+comment1.text=\n\ Create\ a\ zoo\ and\ populate\ it\ using\ data\ from\ a\ text\ file\n
+comment10.params=fileName
+comment10.target=void\ readAnimalData(java.lang.String)
+comment10.text=\n\ Reads\ animal\ data\ from\ a\ file\ and\ adds\ corresponding\ animals\ to\ the\ zoo\n\n\ @param\ \ \ <code>fileName</code>\ a\ <code>String</code>,\ the\ name\ of\ the\ \n\ \ \ \ \ \ \ \ \ \ text\ file\ in\ which\ the\ data\ is\ stored.\n\ \n\ @throws\ \ FileNotFoundException\n
+comment2.params=animal
+comment2.target=void\ storeAnimal(Animal)
+comment2.text=\n\ Adds\ an\ animal\ to\ the\ zoo\n\n\ @param\ \ \ <code>animal</code>\ an\ <code>Animal</code>\ object,\ the\ animal\ to\ be\ added\n
+comment3.params=listPosition
+comment3.target=void\ showAnimal(int)
+comment3.text=\n\ Shows\ an\ animal\ by\ printing\ it's\ details.\ \ This\ includes\n\ it's\ position\ in\ the\ collection.\n\n\ @param\ \ <code>listPosition</code>\ the\ position\ of\ the\ animal\n
+comment4.params=
+comment4.target=int\ numberOfAnimals()
+comment4.text=\n\ Returns\ how\ many\ animals\ are\ stored\ in\ the\ collection\n\n\ @return\ \ \ the\ number\ of\ animals\ in\ the\ collection\n
+comment5.params=
+comment5.target=void\ showAllAnimals()
+comment5.text=\n\ Displays\ all\ the\ animals\ in\ the\ collection\n\n
+comment6.params=listPosition
+comment6.target=void\ removeAnimal(int)
+comment6.text=\n\ Remove\ an\ animal\ from\ the\ collection\n\n\ @param\ \ <code>listPosition</code>\ the\ position\ of\ the\ animal\n
+comment7.params=
+comment7.target=void\ populate()
+comment7.text=\n\ Adds\ a\ pre-defined\ set\ of\ animals\ to\ the\ current\ collection\n\n
+comment8.params=
+comment8.target=void\ countAnimals()
+comment8.text=\n\ Counts\ the\ number\ of\ lions,\ tigers\ and\ elephants\n\n
+comment9.params=fileName
+comment9.target=void\ writeAnimalData(java.lang.String)
+comment9.text=\n\ Writes\ animal\ data\ to\ a\ file\n\n\ @param\ \ \ <code>fileName</code>\ a\ <code>String</code>,\ the\ name\ of\ the\ \n\ \ \ \ \ \ \ \ \ \ text\ file\ in\ which\ the\ data\ will\ be\ stored.\n\ \n\ @throws\ \ FileNotFoundException\n
+numComments=11

Semester 2/Programming 2/Week 1/zoo-io-v3/Zoo.java

@@ -0,0 +1,194 @@
+import java.util.*;
+import java.io.*;
+/**
+ * class <code>Zoo</code> simulates storing animals in a collection.
+ *
+ * @author D Newton
+ * */
+public class Zoo
+{
+   private ArrayList<Animal> animalCollection;
+   private int lionCount;
+   private int tigerCount;
+   private int elephantCount;
+   private int otherCount;
+
+   /**
+    * Create an "empty" zoo
+    */
+   public Zoo()
+   {
+      animalCollection = new ArrayList<Animal>();
+      lionCount = 0;
+      tigerCount = 0;
+      elephantCount = 0;
+      otherCount = 0;
+   }
+
+   /**
+    * Create a zoo and populate it using data from a text file
+    */
+   public Zoo(String fileName) throws FileNotFoundException
+   {
+      this();
+      readAnimalData(fileName);
+   }
+   
+   /**
+    * Adds an animal to the zoo
+    *
+    * @param   <code>animal</code> an <code>Animal</code> object, the animal to be added
+    */
+   public void storeAnimal(Animal animal)
+   {
+      animalCollection.add(animal);
+   }
+
+   /**
+    * Shows an animal by printing it's details.  This includes
+    * it's position in the collection.
+    *
+    * @param  <code>listPosition</code> the position of the animal
+    */
+   public void showAnimal(int listPosition)
+   {
+      Animal animal;
+      if( listPosition < animalCollection.size() )
+      {
+         animal = animalCollection.get(listPosition);
+         System.out.println("Position " + listPosition  + ": " + animal);
+      }
+   }
+
+   /**
+    * Returns how many animals are stored in the collection
+    *
+    * @return   the number of animals in the collection
+    */
+   public int numberOfAnimals()
+   {
+      return animalCollection.size();
+   }
+
+   /**
+    * Displays all the animals in the collection
+    *
+    */
+   public void showAllAnimals()
+   {
+      System.out.println("Zoo");
+      System.out.println("===");
+
+      int listPosition = 0;
+      while( listPosition<animalCollection.size() )
+      {
+         showAnimal(listPosition);
+         listPosition++;
+      }
+      System.out.println(listPosition + " animals shown" );    // display number of animals shown  
+   }
+
+    /**
+    * Remove an animal from the collection
+    *
+    * @param  <code>listPosition</code> the position of the animal
+    */
+   public void removeAnimal(int listPosition)
+   {
+       if( listPosition>=0 && listPosition<animalCollection.size() )
+       {
+          animalCollection.remove(listPosition);
+       }
+       else
+       {
+          System.out.println("Invalid position");
+       }
+   }
+
+  /**
+    * Adds a pre-defined set of animals to the current collection
+    *
+    */
+   public void populate()
+   {
+      storeAnimal( new Animal("lion", "Leo") );
+      storeAnimal( new Animal("tiger", "Tommy") );
+      storeAnimal( new Animal("elephant", "Ollie") );
+      storeAnimal( new Animal("rat", "Roland") );
+      storeAnimal( new Animal("reindeer", "Rudolph") );
+      storeAnimal( new Animal("Lion", "Lenny") );
+      storeAnimal( new Animal("Elephant", "Nellie") );
+      storeAnimal( new Animal("tiger", "Tessa") );
+      storeAnimal( new Animal("eLephant", "Hetty") );
+      storeAnimal( new Animal("LION", "Leslie") );      
+   }
+
+   /**
+    * Counts the number of lions, tigers and elephants
+    *
+    */
+   public void countAnimals( )
+   {
+       lionCount = 0; tigerCount = 0; 
+       elephantCount= 0; otherCount = 0;
+       Iterator<Animal> it = animalCollection.iterator();
+       while( it.hasNext() )
+       {
+           Animal currentAnimal = it.next();
+           String species = currentAnimal.getSpecies();
+           if( species.equalsIgnoreCase("lion") )
+              lionCount++;
+           else if( species.equalsIgnoreCase("tiger") )
+              tigerCount++;
+           else if( species.equalsIgnoreCase("elephant") )
+              elephantCount++;
+           else
+              otherCount++;
+       }
+   }
+
+   /**
+    * Writes animal data to a file
+    *
+    * @param   <code>fileName</code> a <code>String</code>, the name of the 
+    *          text file in which the data will be stored.
+    * 
+    * @throws  FileNotFoundException
+    */
+   public void writeAnimalData(String fileName) throws FileNotFoundException
+   {
+      PrintWriter pWriter = new PrintWriter(fileName);
+      
+      for(Animal a: animalCollection)
+      {
+         String lineOfOutput = a.getName() + "," + a.getSpecies();
+         pWriter.println(lineOfOutput);
+      }
+      pWriter.close();
+   }
+
+   /**
+    * Reads animal data from a file and adds corresponding animals to the zoo
+    *
+    * @param   <code>fileName</code> a <code>String</code>, the name of the 
+    *          text file in which the data is stored.
+    * 
+    * @throws  FileNotFoundException
+    */   
+   public void readAnimalData(String fileName) throws FileNotFoundException
+   {
+	  File dataFile = new File(fileName);
+      Scanner scanner = new Scanner(dataFile);
+      scanner.useDelimiter("[,\n]");
+
+      while( scanner.hasNext() )
+      {
+         String name = scanner.next();
+         name.trim();
+         String species = scanner.next();
+         species.trim();
+         storeAnimal( new Animal(species, name) );
+      }
+      scanner.close();
+   }
+}

Semester 2/Programming 2/Week 1/zoo-io-v3/ZooApp.ctxt

@@ -0,0 +1,5 @@
+#BlueJ class context
+comment0.params=file
+comment0.target=ZooApp(java.lang.String)
+comment0.text=\n\ Constructor\ for\ objects\ of\ class\ ZooApp\n
+numComments=1

Semester 2/Programming 2/Week 1/zoo-io-v3/ZooApp.java

@@ -0,0 +1,22 @@
+
+/**
+ * Write a description of class ZooApp here.
+ * 
+ * @author (your name) 
+ * @version (a version number or a date)
+ */
+import java.io.*;
+public class ZooApp
+{
+    /**
+     * Constructor for objects of class ZooApp
+     */
+    public ZooApp( String file ) throws FileNotFoundException
+    {
+        System.out.println( file );
+        Zoo zoo = new Zoo();
+        zoo.showAllAnimals();
+        zoo.readAnimalData( "new_animals.txt" );
+        zoo.showAllAnimals();
+    }
+}

Semester 2/Programming 2/Week 1/zoo-io-v3/animal_data.txt

@@ -0,0 +1,10 @@
+Leo, Lion
+Tommy, Tiger
+Ollie, Elephant
+Roland, Rat
+Rudolph, Reindeer
+Lenny, Lion
+Nellie, Elephant
+Tessa, Tiger
+Hetty, Elephant
+Leslie, Lion

Semester 2/Programming 2/Week 1/zoo-io-v3/new_animals.txt

@@ -0,0 +1,3 @@
+Bobby, Bear
+Andy, Aardvark
+Polly, African Grey Parrot

Semester 2/Programming 2/Week 1/zoo-io-v3/package.bluej

@@ -0,0 +1,51 @@
+#BlueJ package file
+dependency1.from=Zoo
+dependency1.to=Animal
+dependency1.type=UsesDependency
+dependency2.from=ZooApp
+dependency2.to=Zoo
+dependency2.type=UsesDependency
+objectbench.height=76
+objectbench.width=686
+package.editor.height=400
+package.editor.width=560
+package.editor.x=774
+package.editor.y=277
+package.numDependencies=2
+package.numTargets=3
+package.showExtends=true
+package.showUses=true
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