Java中列表框的使用

package com.Swing;import java.awt.BorderLayout;import java.awt.Color;import javax.swing.JFrame;import javax.swing.JList;import javax.swing.JScrollPane;import javax.swing.JTextField;import javax.swing.event.ListSelectionEvent;import javax.swing.event.ListSelectionListener;public class JListDemo  extends JFrame implements ListSelectionListener{    private JList<String> list;    private JTextField tf=new JTextField("文本框");    private  String[] color={"红色","黄色","蓝色","绿色","紫色","橙色","黑色"};    public JListDemo ( ){        list=new JList(color);        JScrollPane ps=new JScrollPane(list);        list.addListSelectionListener(this);        this.add(ps,BorderLayout.CENTER);        this.add(tf,BorderLayout.NORTH );        this.setTitle("列表框演示");        this.setSize(250,150);        this.setLocationRelativeTo(null);        this.setVisible(true);        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    }    public static void main(String[] args) {        JListDemo jd=new JListDemo( );    }    @Override    public void valueChanged(ListSelectionEvent e) {        JList jlist=(JList) e.getSource();        String name=(String) jlist.getSelectedValue();        if(name=="红色") tf.setBackground(Color.RED);        if(name=="黄色") tf.setBackground(Color.YELLOW);        if(name=="蓝色") tf.setBackground(Color.BLUE);        if(name=="绿色") tf.setBackground(Color.GREEN);    }}

结果：