java-Swing学习(单击按钮添加下拉列表框元素)

package test;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;

import javax.swing.*;
import javax.swing.border.Border;

import org.omg.CORBA.PUBLIC_MEMBER;
//import java.awt.event.*;
import java.net.*;
import java.util.Vector;

public class LayoutTest extends JFrame{
	final static String[] contents = {"我","恨","你"};
	public int x=0;
	public LayoutTest(){
		Container container = getContentPane();
		final JComboBox jcb = new JComboBox();
		final JButton jb = new JButton("显示");
		jb.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				if(x==0){
					for(int i=0;i

以下是结果图;