这道java题怎么做？

想自己预习一下

Java参考源代码：

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;

public class Test10 extends JFrame implements ActionListener {

protected JList lstLeft = null;

protected JList lstRight = null;

protected JButton btnAdd = null;

protected String[] arr = {"新闻", "娱乐", "体育", "教育"};

public Test10() {

super("列表框");

initComponent();

this.setSize(400, 300);

this.setVisible(true);

this.setLayout(new FlowLayout());

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public void initComponent() {

lstLeft = new JList(arr);

lstRight = new JList();

btnAdd = new JButton(">");

this.add(lstLeft);

this.add(btnAdd);

this.add(lstRight);

lstLeft.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

btnAdd.addActionListener(this);

}

public static void main(String[] args) {

new Test10();

}

@Override

public void actionPerformed(ActionEvent e) {

Object[] items = lstLeft.getSelectedValues();

DefaultListModel model = new DefaultListModel();

lstRight.setModel(model);

model.removeAllElements();

for(Object value : items) {

model.addElement(value);

}

}

}

运行测试：

请点击输入图片描述