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Semester 1/Programming 1/Week 9/Week 9 Programming 1.md

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+## Lecture 1 (11:00)
+
+### Flexible-Size Collections
+
+Do not need to specify a size when we create a collection.
+Add as many items without concern for space.
+
+### ArrayList
+- Imported from java.util
+- 
+### ArrayList Methods
+- get()
+- remove()
+
+## Lecture 2 (14:00)
+
+### For Each Loop
+
+```java
+for( Animal animal : animalCollection )
+{
+	System.out.println(animal)
+}
+```
+
+- The scope of `animal` is exclusively local to this loop body
+- `animal` is of the type Animal
+- For each element of type Animal in the `animalCollection` array list
+- Not good for searches.
+
+### While Loop
+
+```java
+public void showAllAnimals()
+{
+	int listPosition = 0;
+	while( listPosition < 6 )
+	{
+		showAnimal( listPosition );
+		listPosition++;
+	}
+}
+```
+
+### Sentinel
+
+```java
+public boolean findAnimal( String myPet ) {
+
+	int listPosition = 0;
+	boolean found = false;
+	
+	while( listPosition < animalCollection.size() && found == false ) {
+	
+		Animal animal = animalCollection.get( listPosition );
+		String name = animal.getName();
+		
+		if( name.equals( myPet ) ) {
+			found = true;
+		}
+		else {
+			listPosition++;
+		}
+	}
+	
+	if( found == true ) {
+		return true
+	}
+	else {
+		return false
+	}
+}
+```