java编写一个“猜数”程序:该程序随机在1到1000的范围中选择一个供用户猜测的整数
帮你修改好了。
package caishuzi;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class Cai {
/**
* @param args
*/static int num;
public static void main(String[] args) {
JFrame f=new JFrame();
JLabel c=new JLabel("Guess a number between 1 and 1000");
JPanel p1=new JPanel();
JPanel p2=new JPanel();
JPanel p3=new JPanel();
JPanel p4=new JPanel();
JPanel p5=new JPanel();
final JTextField a=new JTextField(4);
JButton b=new JButton("获取随机数");
JButton b1=new JButton("确定");
final JTextArea area=new JTextArea();
a.setSize(100, 100);
p1.add(c);
p2.add(a);
p3.add(b);
p4.add(b1);
p5.add(area);
f.setTitle("猜数字");
f.setSize(300, 300);
f.add(p1,BorderLayout.BEFORE_FIRST_LINE);
f.add(p2,BorderLayout.WEST);
f.add(p3,BorderLayout.AFTER_LAST_LINE);
f.add(p4,BorderLayout.AFTER_LINE_ENDS);
f.add(p5,BorderLayout.CENTER);
f.setVisible(true);
b.addActionListener(new ActionListener(){
//Congratulations.You guessed the number
public void actionPerformed(ActionEvent e) {
Random a=new Random();
num=1+a.nextInt(1000);
}
});
b1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e1) {
int i=Integer.parseInt(a.getText());
if(i>num)
area.setText("Too high.Try again");
if(i<num)
area.setText("Too low.Try again");
if(i==num)
area.setText("Congratulations.You guessed the number");
}
});
// TODO Auto-generated method stub
}
}
先按start按钮开始
然后就可以填如数字猜了。。按submit提交，看是否猜中。
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.LayoutFocusTraversalPolicy;
public class Test extends JFrame {
private static int randomNumber = 1895;
public static void main(String[] args) {
final JFrame frame = new JFrame();
JLabel question = new JLabel(
"I have a number between 1 and 1000 ,can you guess my number");
final JLabel hint = new JLabel("please input you number");
final JTextField tf = new JTextField(8);
JButton submit = new JButton("submit");
JButton start = new JButton("Start");
final JPanel panel = new JPanel();
panel.add(question);
panel.add(hint);
panel.add(tf);
tf.setSize(40, 80);
panel.add(submit);
panel.add(start);
frame.add(panel);
frame.setBounds(200, 200, 300, 200);
frame.setVisible(true);
frame.setLayout(new FlowLayout());
start.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
randomNumber = (int) (Math.random() * 1000 + 1);
}
});
submit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
int num = Integer.parseInt(tf.getText());
if (randomNumber != 1895) {
if (randomNumber == num) {
hint.setText("Correct!!");
tf.enable(false);
randomNumber = 1895;
} else if (num >= randomNumber) {
panel.setBackground(Color.RED);
hint.setText("Too Hign");
} else if (num < randomNumber) {
panel.setBackground(Color.BLUE);
hint.setText("Too Low");
}
}
}
});
}
}
本程序的特点是：
(1) 文本框只能输入纯数字；
(2) 界面较美观；
(3) 代码可读性较好，有适当的注释；
(4) 窗体一出现就在桌面居中。
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class GuessNumber {
private static final long serialVersionUID = 1L;
JFrame frame;
JTextField txtNum; //文本框
JButton btnStart; //按钮
JLabel lblPrompt;
JLabel lblMessage;
static int source = 0;
static Random rand = new Random();
public GuessNumber(){
frame = new JFrame("Guess Number");
JPanel pnl1, pnl2, pnl3, pnl4;
pnl1 = new JPanel();
pnl1.setLayout(new FlowLayout(FlowLayout.LEFT));
pnl2 = new JPanel();
pnl2.setLayout(new FlowLayout(FlowLayout.LEFT));
pnl3 = new JPanel();
pnl3.setLayout(new FlowLayout(FlowLayout.LEFT));
pnl4 = new JPanel();
pnl4.setLayout(new FlowLayout(FlowLayout.LEFT));
txtNum = new JTextField(10);
btnStart = new JButton("开始");
lblPrompt = new JLabel("<html><body>I have a number between 1 and 1000 can you guess my number?<br/>Please enter your first guess.</body></html>");
lblMessage = new JLabel();
pnl1.add(lblPrompt);
pnl2.add(txtNum);
pnl3.add(lblMessage);
pnl4.add(btnStart);
frame.setLayout(new GridLayout(4, 1));
frame.add(pnl1);
frame.add(pnl2);
frame.add(pnl3);
frame.add(pnl4);
txtNum.addActionListener(this.new TextAction());
txtNum.addKeyListener(this.new KeyAction());
btnStart.addActionListener(this.new ButtonAction());
frame.setSize(400, 200);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
frame.setResizable(false);
}
public static void main(String[] args) {
new GuessNumber();
while((source=rand.nextInt(1000))==0);
}
//按钮单击后的事件处理
class ButtonAction implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
JButton btn = (JButton)e.getSource();
if(btn == btnStart){
while((source=rand.nextInt(1000))==0);
txtNum.setEditable(true);
}
}
}
//文本框按回车后的事件处理
class TextAction implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
JTextField txt = (JTextField)e.getSource();
if(txt != txtNum){
return;
}
int num = Integer.parseInt(txtNum.getText());
if(num == source){
lblMessage.setText("Correct!");
txtNum.setEditable(false);
txtNum.setBackground(frame.getBackground());
}
else if(num > source){
lblMessage.setText("Too High");
txtNum.setBackground(Color.red);
}
else{
lblMessage.setText("Too Low");
txtNum.setBackground(Color.blue);
}
}
}
//限制文本框只能输入数字
class KeyAction implements KeyListener{
@Override
public void keyPressed(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
}
@Override
public void keyTyped(KeyEvent e) {
int k = e.getKeyChar();
String text = ((JTextField)e.getSource()).getText();
if(!((k>47 && k <58) || (k==8 || k==KeyEvent.VK_PERIOD))){ //限制只能输入数字
e.setKeyChar((char)KeyEvent.VK_CLEAR);
}
if(text.length() > 4){ //限制数值的长度
e.setKeyChar((char)KeyEvent.VK_CLEAR);
}
}
}
}
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