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百钱买百鸡问题--java 实现

2007-06-30 09:38 459 查看

百钱买百鸡问题--java 实现

＞＞ [b]运行结果：[/b]

点击"解答"按钮后：

点击“退出”按钮即可退出！

＞＞ 原代码：（以下程序在eclipse里调试通过）

package com.huqianhao.homework;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.border.Border;

public class ChickenProgram extends JFrame implements ActionListener {

private static final long serialVersionUID = 1L;
private static final int PRICE_PER_COCK = 5; // 公鸡5元钱一只
private static final int PRICE_PER_HEN = 3; // 母鸡3元钱一只
private static final int PRICE_THREE_CHICKENS = 1; // 小鸡1元钱三只
private static final double TOTAL_MONEY = 100;
private static final int NO_OF_CHOOKS = 100; // 总的鸡数量
JPanel panel1, panel2;
JLabel resultLabel;

public ChickenProgram() {
Container contentPane = getContentPane();
contentPane.setLayout(new BorderLayout());
panel1=new JPanel();
panel1.setLayout(new GridLayout(1,3));
panel2=new JPanel();
panel2.setLayout(new BorderLayout());

JLabel cockLabel, henLabel, chickenLabel;
cockLabel = new JLabel("每只公鸡：" + PRICE_PER_COCK + "元");
henLabel = new JLabel("每只母鸡：" + PRICE_PER_HEN + "元");
chickenLabel = new JLabel("小鸡：" + PRICE_THREE_CHICKENS + "元钱三只");

JButton calculateButton = new JButton("解答");
calculateButton.addActionListener(this);
JPanel smallPanel=new JPanel();
smallPanel.add(calculateButton);
JButton exitButton=new JButton("退出");
smallPanel.add(exitButton);
exitButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
System.exit(0);
}
});

String question = "问题："+TOTAL_MONEY + "元钱买" + NO_OF_CHOOKS
+ "只鸡，问公鸡、母鸡、小鸡各买多少只？";
JLabel questionLabel = new JLabel(question);
Border border1=BorderFactory.createTitledBorder("鸡的价格");
Border border2=BorderFactory.createTitledBorder(question);
resultLabel = new JLabel("");

panel1.add(cockLabel);
panel1.add(henLabel);
panel1.add(chickenLabel);
panel1.setBorder(border1);

panel2.setBorder(border2);
// panel2.add(questionLabel);
panel2.add(smallPanel,BorderLayout.SOUTH);
panel2.add(resultLabel);
contentPane.add(panel1,BorderLayout.NORTH);
contentPane.add(panel2,BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public static void main(String args[]) {
ChickenProgram frame = new ChickenProgram();
frame.setTitle("百钱买百鸡问题");
frame.setVisible(true);
frame.setSize(500, 300);
}

public void actionPerformed(ActionEvent e) {

String resultString = "<html>以下是几种可行方案：<ul>";
int noOfcocks, noOfHens, noOfchickens;

for (noOfcocks = 0; noOfcocks <= TOTAL_MONEY / PRICE_PER_COCK; noOfcocks++) {
for (noOfHens = 0; noOfHens <= TOTAL_MONEY / PRICE_PER_HEN; noOfHens++) {
noOfchickens = NO_OF_CHOOKS - noOfcocks - noOfHens;
if (PRICE_PER_COCK * noOfcocks + PRICE_PER_HEN * noOfHens
+ noOfchickens * (PRICE_THREE_CHICKENS / 3.0) == TOTAL_MONEY){
resultString += ("<li>公鸡-->" + noOfcocks + " 母鸡-->" + noOfHens
+ " 小鸡-->" + noOfchickens+"</li>");
}
resultLabel.setText(resultString+"</ul></html>");
}
}

}
}

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