It’s finally time I got around to learning java. I’ve spent most of the past few years using Matlab and writing C or vb applications.
Here are some easy lead in and hello world examples for java.
import javax.swing.JOptionPane;public class HelloWorldGUI {
public static void main(String[] args) {
System.out.print("Hello World");
JOptionPane.showMessageDialog( null, "Hello World!" );
}
}This is a nice easy into to java programming as the universal ‘Hello World’ application helps demonstrate functionality with a minimum of code.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class HelloWorldGUI2 {
private static class HelloWorldDisplay extends JPanel {
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawString( “Hello World!”, 20, 30 );
}
}
private static class ButtonHandler implements ActionListener {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
public static void main(String[] args) {
HelloWorldDisplay displayPanel = new HelloWorldDisplay();
JButton okButton = new JButton(“OK”);
ButtonHandler listener = new ButtonHandler();
okButton.addActionListener(listener);
JPanel content = new JPanel();
content.setLayout(new BorderLayout());
content.add(displayPanel, BorderLayout.CENTER);
content.add(okButton, BorderLayout.SOUTH);
JFrame window = new JFrame(“Hello World”);
window.setContentPane(content);
window.setSize(250,100);
window.setLocation(100,100);
window.setVisible(true);
}
}
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