Swing：元件：JPanel

import java.awt.Color;
import java.awt.FlowLayout;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

class Frame8 extends JFrame{
 private JPanel contentPane1,contentPane2;
 
 Frame8(){
  
  contentPane1 = new JPanel();
  add(contentPane1);
  contentPane1.setBounds(10, 20, 100, 120);
  contentPane1.setBorder(BorderFactory.createLineBorder(Color.black));
  contentPane1.setLayout(new FlowLayout(FlowLayout.LEFT));
  
  JButton btn1 = new JButton("按鈕1");
  btn1.setBounds(0, 0, 100, 30);
  contentPane1.add(btn1);
  
  contentPane2 = new JPanel();
  add(contentPane2);
  contentPane2.setBounds(150, 20, 100, 120);
  contentPane2.setBorder(BorderFactory.createLineBorder(Color.black));
  contentPane2.setLayout(new FlowLayout(FlowLayout.LEFT));
  
  JButton btn2 = new JButton("按鈕2");
  btn2.setBounds(100, 0, 100, 30);
  contentPane2.add(btn2);
  
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  setLayout(null);
  setBounds(0,0,450,300);
  setTitle("Swing JFrame 視窗");
  setVisible(true);
 }
}
public class FrameJPanel2 {

 public static void main(String[] args) {
  Frame8 frame = new Frame8();
 }

}

執行結果