Unnamed

import java.awt.*;import javax.swing.*;import java.awt.event.*;public class ButtonTest {  public static void main(String[] args) {    ButtonFrame frame = new ButtonFrame();    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    frame.setVisible(true);  }}class ButtonFrame extends JFrame {  public ButtonFrame() {    setTitle("ButtonTest");    setSize(300, 200);    ButtonPanel panel = new ButtonPanel();    add(panel);        ButtonPanel2 panel2 = new ButtonPanel2();    add(panel2);  }}class ButtonPanel extends JPanel {  public ButtonPanel() {    setLayout(null);    setOpaque(false);    //create buttons    JButton yellowButton = new JButton("yellow");        //set location    yellowButton.setBounds(10, 10, 50, 30);    //add buttons to pane;    add(yellowButton);  }}  class ButtonPanel2 extends JPanel {  public ButtonPanel2() {    setLayout(null);    setOpaque(false);        //create buttons    JButton blueButton = new JButton("blue");    //set location    blueButton.setBounds(10, 40, 50, 30);    //add buttons to pane;    add(blueButton);  }}