Java Simple AWT Swing On Notepad++

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1. copy and paste the following code into a Notepad++ window

   import java.awt.Color; import java.awt.Graphics; import java.awt.GridLayout; import java.awt.Container;   import javax.swing.JFrame; import javax.swing.JPanel;   public class Draw4Ovals extends JPanel {     Color color;     public Draw4Ovals(Color color) {         this.color = color;     this.setBackground(Color.BLACK);     this.setOpaque(true);    //needed to ensure panel background is set   }     public void paintComponent(Graphics g) {     super.paintComponent(g);    //needed to ensure that panel background is set     int width = getWidth();     int height = getHeight();     g.setColor(color);     g.fillOval(0, 0, width, height);   }     public static void main(String args[]) {     JFrame frame = new JFrame("Oval Sample");     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       Container content = frame.getContentPane();     content.setBackground(new Color(180,230,255));         content.setLayout(new GridLayout(2, 2, 5 ,5));     Color colors[] = { Color.RED, Color.BLUE, Color.GREEN, Color.YELLOW };     for(Color c: colors) {       Draw4Ovals panel = new Draw4Ovals(c);            content.add(panel);     } //validate must be done on the component that has the .add() and the layoutManager     content.validate();         frame.setSize(300, 200);     frame.setLocation(50,100);     frame.setVisible(true);       } }

2. Save this file as “Draw4Ovals.java”.  Upper-case is important. Once it is saved, you’ll see that Notepad++ does syntax highlighting.
3. Select the Macros menu, then click on the Java-compile macro near the bottom. The results should look like this: .
4. Now select the macro “Java-run”. You should see this:
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5. If, in addition, you want to test an applet,
   1. paste the following code
   2. save it as “TestApplet.java”
   3. run “Java-compile”
   4. run “Java-applet-HTML”
   5. now either view the file in a browser, or else run “Java-applet-viewer”

      import java.awt.*; import java.awt.event.*; // import java.applet.Applet; import javax.swing.*;   public class TestApplet extends JApplet implements ActionListener { Button b; JLabel jl; public void init(){ setLayout(new FlowLayout()); b = new Button("push me"); b.addActionListener(this); add(b); jl = new JLabel("Welome to my applet"); add(jl); }   public void actionPerformed(ActionEvent e){ jl.setText("You clicked?"); } }

6. Note: ♦Applets are no longer used as much as other types of web-programming.
   ♦The Java-applet-HTML script just makes a very simple HTML page. If you want to put an applet in a webpage, you should actually make a decent webpage.

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from: http://www.quarkphysics.ca/scripsi/java_notepad/

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