Question

java这道题该怎么做

Answer 1

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

Answer 2

Scanner input1 = new Scanner(System.in).
System.out.println(“请输入第一个操作数：”);
Scanner input2 = new Scanner(System.in).
System.out.println(“请输入第二个操作数：”);
String s1 = input1.next();
String s2 = input2.next();
if(!s1.equals(s2)){
System.out.peintln(“请输入正确数字”);
}

Answer 3

用Scanner和if就搞定了

追问

判断怎么判断

追答

Scanner input = new Scanner(System.in).
System.out.println(“请输入:”);
String s = input.next();
if(“5”.equals(s))｛
System.out.peintln(“Ok”);
｝

Answer 4

如上回答 已经搞定了