GUI Examples

//Example 1 ********************************************************
/*********** Creates a simple frame ***********/
import java.awt.Color;
import javax.swing.JFrame;
public class GUIFrameProject {
    public static void main(String[] args) {
        JFrame frame = new JFrame("My Frame");
        frame.setSize(500, 600);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}
//Example 2 ********************************************************
/****** Creates a simple frame with a few components ******/
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class GUISimpleStartWithPanel {
    private static final int FRAME_WIDTH = 300;
    private static final int FRAME_HEIGHT = 200;
    
    public static void main(String[] args) {
        JFrame frame = new JFrame("My Frame");
        frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
              
        JButton button = new JButton("Press me");
        JButton button2 = new JButton("Press me also");
        JLabel label = new JLabel("I'm a Label");
        
        JPanel panel = new JPanel();
        panel.add(button);
        panel.add(button2);
        panel.add(label);
        
        frame.add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}
//Example 3 ********************************************************
/***** Shows how to extend a JFrame  *******/
import java.awt.Color;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class FilledFrame extends JFrame {
    JButton button = new JButton("Press me");
    private JLabel label = new JLabel("I'm a Label");
    private static final int FRAME_WIDTH = 300;
    private static final int FRAME_HEIGHT = 200;

    public FilledFrame() {
        super("My Frame");
        createComponents();
        this.setSize(FRAME_WIDTH, FRAME_HEIGHT);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }
    public void createComponents() {
        JPanel panel = new JPanel();
        panel.setBackground(Color.red);
        panel.add(button);
        panel.add(label);
        this.add(panel);
    }
    
    public static void main(String[] args) {
        FilledFrame frame = new FilledFrame();       
    }
}
//Example 4 ********************************************************
/* ***** Adding functionality to button press: We create a new action listener
 * class and add an instance of it to our button. When the button is clicked
 * "I was clicked" is printed on the console.
 */
import java.awt.Color;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class FilledFrame extends JFrame {
    JButton button;
    private JLabel label;
    private static final int FRAME_WIDTH = 300;
    private static final int FRAME_HEIGHT = 200;

    public FilledFrame() {
        super("My Frame");
        createComponents();
        this.setSize(FRAME_WIDTH, FRAME_HEIGHT);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public void createComponents() {
        button = new JButton("Press me");
        label = new JLabel("I'm a Label");
        button.addActionListener(new ClickListener());
        JPanel panel = new JPanel();
        panel.setBackground(new Color(150,150,255));
        panel.add(button);
        panel.add(label);
        this.add(panel);
    }
    
    public static void main(String[] args) {
        FilledFrame frame = new FilledFrame();      
    }
}
/** The Button Listener class */
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class ClickListener implements ActionListener {
    public void actionPerformed(ActionEvent ae) {
        System.out.println("I was clicked");
    }     
}
//Example 5 ********************************************************
/*  Shows how to create a local inner class:
 * Create a new action listener class inside of the FilledFrame class and
 * add an instance of it to our button. Note: Methods of inner classss can 
 * access the instance variables and methods of the surrounding class.
 */
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class FilledFrame extends JFrame {
    JButton button;
    private JLabel label;
    private static final int FRAME_WIDTH = 300;
    private static final int FRAME_HEIGHT = 200;

    class ClickListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            label.setText("I was clicked");
        }
    }

    public FilledFrame() {
        super("My Frame");
        createComponents();
        this.setSize(FRAME_WIDTH, FRAME_HEIGHT);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public void createComponents() {
        button = new JButton("Press me");
        label = new JLabel("I'm a Label");
        button.addActionListener(new ClickListener());
        JPanel panel = new JPanel();
        panel.setBackground(Color.red);
        panel.add(button);
        panel.add(label);
        this.add(panel);
    }
    
    public static void main(String[] args) {
        FilledFrame frame = new FilledFrame();     
    }
}
//Example 6 ********************************************************
/*  Same as Part 5 except it uses an anonymous inner class. */
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class FilledFrame extends JFrame {
    JButton button;
    private JLabel label;
    private static final int FRAME_WIDTH = 300;
    private static final int FRAME_HEIGHT = 200;
    public FilledFrame() {
        super("My Frame");
        createComponents();
        this.setSize(FRAME_WIDTH, FRAME_HEIGHT);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public void createComponents() {
        button = new JButton("Press me");
        label = new JLabel("I'm a Label");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                label.setText("I was clicked");
            }
        });
        JPanel panel = new JPanel();
        panel.setBackground(Color.red);
        panel.add(button);
        panel.add(label);
        this.add(panel);
    }

    public static void main(String[] args) {
        FilledFrame frame = new FilledFrame();
    }
}

//Example 7 ********************************************************
/** Shows how to create a program with a drawable area  */
import java.awt.Graphics;
import javax.swing.JComponent;
import javax.swing.JFrame;

public class DrawingProject {
    JFrame myFrame;
    DrawArea myDrawArea;
    final int FRAME_WIDTH = 256;
    final int FRAME_HEIGHT = 512;
    
    public DrawingProject() {
        myFrame = new JFrame("Simple Drawing Program)");
        myFrame.setSize(FRAME_WIDTH, FRAME_WIDTH);     
        myDrawArea = new DrawArea();
        myFrame.add(myDrawArea);       
        myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        myFrame.setVisible(true);        
    }
    
    public static void main(String[] args) {
        DrawingProject myFrame = new DrawingProject();
    }
}
/** A component class for drawing */
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JComponent;

public class DrawArea extends JComponent {
    public void paintComponent(Graphics g) {      
        for (int row = 0; row< this.getHeight(); row++) {
            for (int col = 0 ; col < this.getWidth(); col++) {               
                g.setColor(new Color(row % 256, 0, 255));
                g.drawLine(col,row, col, row+1);
            }
        }       
        g.drawRect(10, 20, 40, 60);
    }
}