[黑马] --第1天 Swing 下拉列表

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package com.test1;/* * Swing 下拉列表 */import java.awt.*;import javax.swing.*;public class Demo8_8 extends JFrame{//定义JPanel jp1,jp2;JLabel jlb1,jlb2;JComboBox jcb1;JList jlist;JScrollPane jsp;public static void main(String[] args) {Demo8_8 demo = new Demo8_8();}/* * 构造函数 */public Demo8_8(){//创建组件jp1 = new JPanel();jp2 = new JPanel();jlb1 = new JLabel("你的籍贯");jlb2 = new JLabel("旅游地点");String[] jg = {"北京","上海","天津","兰州","火星"};jcb1 = new JComboBox(jg);String[] dd = {"长城","故宫","天安门","九寨沟","张卜村"};jlist = new JList(dd);//设置你希望显示多少个选项jlist.setVisibleRowCount(2);jsp = new JScrollPane(jlist);//设置布局this.setLayout(new GridLayout(3,1));//添加组件jp1.add(jlb1);jp1.add(jcb1);jp2.add(jlb2);jp2.add(jsp);this.add(jp1);this.add(jp2);//设置标题this.setTitle("用户名登陆");//设置大小this.setSize(400,300);//禁止改变窗体大小this.setResizable(false);//关闭窗口this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//显示窗体this.setVisible(true);}}

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