frame_example.java

frame_example.java

import java.awt.*;
import java.awt.event.*;

public class Rei26 extends Frame {
    private int oldx = 0, oldy = 0;
    public Rei26() {
        setSize(400, 300);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        addMouseListener(new MouseAdapter() {
            public void mousePressed(MouseEvent e) {
                oldx = e.getX();
                oldy = e.getY();
            }
        });
        addMouseMotionListener(new MouseMotionAdapter() {
            public void mouseDragged(MouseEvent e) {
                Graphics g = getGraphics();
                int x = e.getX();
                int y = e.getY();
                setTitle("x=" + x + ": y=" + y);
                g.drawLine(oldx, oldy, x, y);
                oldx = x;
                oldy = y;
                g.dispose();
            }
        });
    }
    
    public static void main(String[] args) {
        Frame w = new Rei26();
        w.show();
    }
}