银行存钱取钱余额的图形程序

//放入文件 F1.java中

//result1.src.result1.F1.java

package result1;

 

import java.awt.Color;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.Scanner;

 

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

 

//模拟银行存取钱

class JieMian extends JFrame {

 

String string[] = new String[3];

JButton jButton[] = new JButton[3];

JLabel jLabel[] = new JLabel[3];

 

public JieMian() {

// TODO Auto-generated constructor stub

 

setSize(400, 200);

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);

setTitle("建设银行");

setLayout(new GridLayout(3, 2));

for (int i = 0; i < jButton.length; i++) {

// 3个按钮

jButton[i] = new JButton("确定");

}

string[0] = new String("存钱");

string[1] = new String("取钱");

string[2] = new String("余额");

 

for (int i = 0; i < 3; i++) {

jLabel[i] = new JLabel(string[i]);

}

for (int i = 0; i < jButton.length; i++) {

add(jLabel[i]);

jLabel[i].setFont(new Font("黑体",Font.ITALIC,50));

jButton[i].setBackground(Color.red);

add(jButton[i]);

}

 

jButton[0].addActionListener(new Tf3());

jButton[1].addActionListener(new Tf());

jButton[2].addActionListener(new Tf1());

validate();

}

}

class Tf3 implements ActionListener{

public void actionPerformed(ActionEvent event) {

// 存钱

Bank bank = new Bank();

Scanner scanner = new Scanner(System.in);

System.out.print("请输入存钱数:");

double monkey = scanner.nextDouble();

bank.setMoney(monkey);

}

}

class Tf implements ActionListener {

 

public void actionPerformed(ActionEvent event) {

// 取钱

Bank bank = new Bank();

System.out.print("请输入取钱金额:");

Scanner scanner = new Scanner(System.in);

bank.take(scanner.nextDouble());

//重点，scanner不能关闭，因为要实现多次输入

}

}

 

class Tf1 implements ActionListener {

 

public void actionPerformed(ActionEvent event) {

// 账户余额

Bank bank = new Bank();

JOptionPane.showMessageDialog(null, "余额为：" + bank.getMoney());

 

}

}

 

class Bank {

// 银行类

static double money = 200;// 类变量，类名和对象名直接引用

 

public void take(double monkey) {

// 类方法，取钱方法

// 定义同步线程保护数据方法，同一时刻调用方法的线程只能排队

money = money - monkey;

}

 

public void setMoney(double monkey) {

// 存钱方法

money = money + monkey;

}

 

public double getMoney() {

// 查看帐户余额

return money;

}

}

 

//测试程序放入F2.java中

//路径 result.src.result1.F2.java

 

public class F2 {

public static void main(String[] args) {

new JieMian();

}

 

}