first commit

2024-01-15 20:14:10 +00:00
commit 8c81ee28b7
3106 changed files with 474415 additions and 0 deletions
--- a/1/Java/examples/appletdemo/CaseConverter.java
+++ b/1/Java/examples/appletdemo/CaseConverter.java
@@ -0,0 +1,104 @@
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+
+/**
+ * Class CaseConverter - A simple applet that takes input from a text field 
+ * and converts to upper or lower case in response to user button selection. 
+ * Works well with a width of 300 and height of 120.
+ *  
+ * Aug 2004: Updated from Applet to JApplet (mik)
+ *
+ * @author Bruce Quig 
+ * @author Michael Kolling
+ * 
+ * @version 2004-08-04
+ */
+public class CaseConverter extends JApplet
+     implements ActionListener
+{
+    private JTextField inputField;
+    private final String UPPERCASE = "UPPERCASE";
+    private final String LOWERCASE = "lowercase";
+    private final String CLEAR = "Clear";
+
+     /**
+     * Called by the browser or applet viewer to inform this JApplet that it
+     * has been loaded into the system. It is always called before the first 
+     * time that the start method is called.
+     */
+    public void init()
+    {
+        // GUI elements are added to the applet's content pane, so get it for us.
+        Container contentPane = getContentPane();
+        
+        // set a layout with some spacing
+        contentPane.setLayout(new BorderLayout(12,12));
+        
+        // add the title label
+        JLabel title = new JLabel("Case Converter - A BlueJ demo applet");
+        contentPane.add(title, BorderLayout.NORTH);
+       
+        // create the center part with prompt and text field and add it
+        JPanel centerPanel = new JPanel();
+        JLabel prompt = new JLabel("Enter a string:");
+        centerPanel.add(prompt);
+        inputField = new JTextField(16);
+        centerPanel.add(inputField);
+        
+        contentPane.add(centerPanel, BorderLayout.CENTER);
+
+        // make a panel for the buttons
+        JPanel buttonPanel = new JPanel();
+        
+        // add the buttons to the button panel
+        JButton uppercase = new JButton(UPPERCASE);
+        uppercase.addActionListener(this);
+        buttonPanel.add(uppercase);
+        
+        JButton lowercase = new JButton(LOWERCASE);
+        lowercase.addActionListener(this); 
+        buttonPanel.add(lowercase);
+        
+        JButton clear = new JButton(CLEAR);
+        clear.addActionListener(this);
+        buttonPanel.add(clear);
+        
+        // add the buttons panel to the content pane
+        contentPane.add(buttonPanel, BorderLayout.SOUTH);
+    }
+
+    /**
+     * Returns information about this applet. 
+     * An applet should override this method to return a String containing 
+     * information about the author, version, and copyright of the JApplet.
+     *
+     * @return a String representation of information about this JApplet
+     */
+    public String getAppletInfo()
+    {
+        return "Title: Case Converter  \n" +
+               "Author: Bruce Quig  \n" +
+               "A simple applet that converts text to upper or lower case. ";
+    }
+
+    /**
+     * ActionListener Interface method.
+     * Called when action events occur with registered components that
+     * can fire action events.
+     * @param  ae   the ActionEvent object created by the event
+     */
+    public void actionPerformed(ActionEvent evt)
+    {
+        String command = evt.getActionCommand();
+        // if clear button pressed
+        if(CLEAR.equals(command))
+            inputField.setText("");
+        // uppercase button pressed
+        else if(UPPERCASE.equals(command))
+            inputField.setText(inputField.getText().toUpperCase());
+        // lowercase button pressed
+        else if(LOWERCASE.equals(command))
+            inputField.setText(inputField.getText().toLowerCase());
+    }
+}