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Код

import java.awt.Graphics;

public class NewJFrame extends javax.swing.JFrame {
    public NewJFrame() {
        initComponents();
    }
                 
    private void initComponents() {
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        addComponentListener(new java.awt.event.ComponentAdapter() {
            public void componentResized(java.awt.event.ComponentEvent evt) {
                formComponentResized(evt);
            }
        });
        pack();
    }                       

    private void formComponentResized(java.awt.event.ComponentEvent evt) {                                      
        repaint();
    }                                     
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
            }
        });
    }
       
    public void paint(Graphics g) {
        g.drawRect(20, 40, 70, 70);
    }
}