Membuat Bola

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import java.awt.Graphics;
public class Bola extends javax.swing.JFrame {
    public void paint (Graphics g) {
        g.drawOval(100, 100, 100, 100);
        g.drawOval(125, 100, 50, 100);
        g.drawOval(100, 125, 100, 50);
    }
    public Bola() {
        initComponents();
    }
    @SuppressWarnings("unchecked")
   
    private void initComponents() {
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGap(0, 400, Short.MAX_VALUE));
        layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGap(0, 400, Short.MAX_VALUE));
        pack();
    }
}

public class MainBola {
    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Bola().setVisible(true);
            }
        });
    }
}