程序代码：
package com.os.frame;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
/**
*
* @author RenHongWei
*/
public class MainFrame extends JFrame {
public static void main(String[] args) {
new MainFrame("QQ");
}
JPanel jp = null;
JTextArea jta = null;
JTextField jtf = null;
JScrollPane jsp = null;
JComboBox jcb = null;
JButton jb = null;
public MainFrame(String title) {
super(title);
initComponent();
initFrame();
initLayout();
}
private void initLayout() {
this.setLayout(new BorderLayout());
this.add(jsp);
this.add(jp， BorderLayout.SOUTH);
}
private void initFrame() {
this.setSize(500， 300);
this.setLocation(200， 200);
this.setIconImage(new ImageIcon("images/Penguins.jpg").getImage());
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
private void initComponent() {
jta = new JTextArea();
jsp = new JScrollPane(jta);
jp = new JPanel();
String[] chatter = { "Boy"， "Lady" };
jcb = new JComboBox(chatter);
jtf = new JTextField(10);
jb = new JButton("Send");
jp.add(jcb);
jp.add(jtf);
jp.add(jb);
}
}
　　调试界面：