Java图形界面——下拉框、列表框、滚动窗格组件

package com.test.swing;

import javax.swing.*;
import java.awt.*;

public class Test0 extends JFrame{
JList jlist;	//列表框
JComboBox jcb;	//下拉框
JPanel jp1, jp2;	//面板
JLabel jlb1, jlb2;
JScrollPane jsp;	//滚动控件

//构造函数
public Test0(){
jp1 = new JPanel();
jp2 = new JPanel();

jlb1 = new JLabel("你的水平：");
String str1[] = {"巨坑", "菜鸟", "一般", "大神"};
jcb = new JComboBox(str1);

jlb2 = new JLabel("选择英雄：");
String str2[] = {"盖仑", "艾希", "提莫", "赵信", "李青", "安妮"};
jlist = new JList(str2);
jlist.setVisibleRowCount(2);//默认显示行数
jsp = new JScrollPane(jlist);

jp1.add(jlb1);
jp1.add(jcb);

jp2.add(jlb2);
jp2.add(jsp);

//网格布局2行一列
this.setLayout(new GridLayout(2, 1));

this.add(jp1);
this.add(jp2);

this.setSize(200,200);
this.setTitle("组件演示");
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public static void main(String[] args) {
Test0 test0 = new Test0();

}

}