//Guess a number between 1 and 1000
//Java how to program, 10/e, Exercise 12.14
//by pandenghuang@163.com
/* (Guess-the-Number Game) Write an application that plays “guess the number” as follows:
Your application chooses the number to be guessed by selecting an integer at random in the range
1–1000. The application then displays the following in a label:
I have a number between 1 and 1000. Can you guess my number?
Please enter your first guess.
A  JTextField should be used to input the guess. As each guess is input, the background color
should change to either red or blue. Red indicates that the user is getting “warmer,” and blue,
“colder.” A  JLabel should display either  "Too High" or  "Too Low" to help the user zero in. When
the user gets the correct answer,  "Correct!" should be displayed, and the  JTextField used for
input should be changed to be uneditable. A  JButton should be provided to allow the user to play
the game again. When the  JButton is clicked, a new random number should be generated and the
input  JTextField changed to be editable.
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.BorderLayout;
import static java.awt.BorderLayout.*;public class NumberGuessGame2016 extends JFrame {
int number,random,counter=0;
JLabel welcomeJLabel;
JLabel hintJLabel;
JTextField guessField;
JPanel panel;//显示不同背景色public NumberGuessGame2016() {super("猜数字小游戏游戏");setLayout(new BorderLayout());panel=new JPanel();panel.setBackground(Color.WHITE);welcomeJLabel= new JLabel("游戏规则：已随机生成一个1到1000的整数，您能在10次以内猜出来吗？");welcomeJLabel.setFont(new Font("Simsun",1,10));add(welcomeJLabel,NORTH);guessField=new JTextField(20);guessField.setFont(new Font("Arial",1,10));panel.add(guessField);add(panel); //默认添加到中间hintJLabel= new JLabel("");add(hintJLabel,SOUTH);hintJLabel.setFont(new Font("Simsun",1,10));TextFieldHandler handler=new TextFieldHandler();guessField.addActionListener(handler);random=(int)(1+1000*Math.random());}private class TextFieldHandler implements ActionListener
{// process textfield events@Overridepublic void actionPerformed (ActionEvent event){while(true){number=Integer.parseInt(guessField.getText());while(number!=random){number=Integer.parseInt(guessField.getText());if(number>random){hintJLabel.setText("猜高了，不要放弃哦↖(^ω^)↗。已试错"+(++counter)+"次");guessField.setText("");panel.setBackground(Color.RED);}else{hintJLabel.setText("猜低了，请继续！已试错"+(++counter)+"次");panel.setBackground(Color.BLUE);guessField.setText("");}}//猜中后的用户提示if (counter<10)JOptionPane.showMessageDialog(null, "恭喜你，猜中了，难道你知道答案？O(∩_∩)O~");else if (counter==10)JOptionPane.showMessageDialog(null, "辛苦了，终于猜中了！");elseJOptionPane.showMessageDialog(null, "您终于猜中了╮(╯▽╰)╭，您其实可以做得更好的！");//开始下一轮猜数字游戏前的初始化工作guessField.setText("");random=(int)(1+1000*Math.random());counter=0;}}
}public static void main(String[] args)
{ NumberGuessGame2016 f = new NumberGuessGame2016(); // create ListFramef.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);f.setSize(400,300); f.setVisible(true);
}
}