java Swing组件练习三

/**
 * JComboBox  下拉框组件
 * JList      列表框组件
 * JScrollPane 滚动窗格组件
 */
package 韩顺平;

import java.awt.GridLayout;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class Demo4 extends JFrame{

	//定义组件
	JPanel jp1,jp2;
	JLabel jl1,jl2;
	JComboBox jcb1;
	JList jlist;
	JScrollPane jsp;
	
	public static void main(String[] args) {
		// TODO 自动生成的方法存根
        Demo4 d4 = new Demo4();
	}
	
	//构造方法
	public Demo4() {
		jp1 = new JPanel();
		jp2 = new JPanel();
		
		jl1 = new JLabel("你的籍贯");
		jl2 = new JLabel("旅游景点");
		
		String[] jg = {"河南省","河北省","湖北省","湖南省"};
		jcb1 = new JComboBox(jg);
		
		String[] dd = {"九寨沟","*","故宫","长城","西湖"};
		jlist = new JList(dd);
		//设置列表框显示的选项的个数
		jlist.setVisibleRowCount(3);
		//把jlist加入到jsp中
		jsp = new JScrollPane(jlist);
		
		
		//设置布局
		this.setLayout(new GridLayout(3, 1));
		
		//添加组件
		jp1.add(jl1);
		jp1.add(jcb1);
		
		jp2.add(jl2);
		jp2.add(jsp);
		
		this.add(jp1);
		this.add(jp2);
		
		this.setTitle("欢迎");
		this.setSize(400, 300);
		this.setLocation(200, 200);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setVisible(true);
	}

}