模拟题参考答案

1、 参考答案：

文件Person.java，该类定义完整20分

package p1;

public class Person {

String name;

public String getName() {

return name;

}

public Person()

{

this("0");

}

public Person(String name)

{

this.name=name;

}

}

文件Teacher.java，该类定义完整20分

pckage p1;

public class Teacher extends Person{

String ID;

public String getID() {

return ID;

}

public Teacher(String s1,String s2)

{

this.name=s1;

this.ID=s2;

}

public static void main(String[] args) {

// TODO Auto-generated method stub

Teacher t=new Teacher("黄牧","000001");

System.out.println(t.getName());

System.out.println(t.getID());

}

}

2、 参考答案：

package p2;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;

public class num_2 extends JFrame implements ActionListener{

JRadioButton rbtSing,rbtDancing,rbtPlaygame;

JTextField text;

public num_2()

{

this.setSize(300,200);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

JPanel panel=new JPanel();

panel.setLayout(new GridLayout(1,3));

ButtonGroup g=new ButtonGroup();

rbtSing=new JRadioButton("唱歌");

rbtDancing=new JRadioButton("跳舞");

rbtPlaygame=new JRadioButton("玩游戏");

g.add(rbtSing);

g.add(rbtDancing);

g.add(rbtPlaygame);

panel.add(rbtSing);

panel.add(rbtDancing);

panel.add(rbtPlaygame);

this.getContentPane().add(panel);

text=new JTextField();

this.getContentPane().add(text,"South");

rbtSing.addActionListener(this);

rbtDancing.addActionListener(this);

rbtPlaygame.addActionListener(this);

this.setVisible(true);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

new num_2();

}

@Override

public void actionPerformed(ActionEvent arg0) {

// TODO Auto-generated method stub

if(arg0.getSource()==rbtSing)

{

text.setText("唱歌被选中！");

}

if(arg0.getSource()==rbtDancing)

{

text.setText("跳舞被选中！");

}

if(arg0.getSource()==rbtPlaygame)

{

text.setText("玩游戏被选中！");

}

}

}

3、参考答案：

package p3;

import java.awt.BorderLayout;

import java.awt.FlowLayout;

import java.awt.GridLayout;

import java.awt.event.ActionListener;

import java.text.SimpleDateFormat;

import java.util.Date;

import javax.swing.*;

public class ClockJFrame extends JFrame implements Runnable{

JLabel lbl;

SimpleDateFormat sdf;

Thread thread;

public ClockJFrame()

{

super("数字时钟");

this.setBounds(0,0,300,200);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

JPanel panel=new JPanel();

sdf=new SimpleDateFormat("hh:mm:ss");

Date date=new Date();

sdf.format(date);

lbl=new JLabel();

lbl.setText(sdf.format(new Date()));

lbl.setHorizontalAlignment(lbl.CENTER);

this.add(lbl);

this.setVisible(true);

thread=new Thread(this);

thread.start();

}

public static void main(String[] args) {

// TODO Auto-generated method stub

new ClockJFrame();

}

@Override

public void run() {

// TODO Auto-generated method stub

while(true)

{

lbl.setText(sdf.format(new Date()));

try {

Thread.sleep(1000);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}

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