Java利用多线程模拟银行系统存钱问题
目录
- 多线程6(模拟银行系统存钱)
- 1.题目
- 2.解题思路
- 3.代码详解
多线程6(模拟银行系统存钱)
1.题目
模拟一个简单的银行系统,使用两个不同的线程向同一个账户存钱。
实现:使用synchronized关键字,将存钱的方法修改成同步的。
2.解题思路
创建一个类:SynchronizedBankFrame,继承JFrame类
写一个内部类Bank
- 定义一个account变量,来表示账户。
- deposit():一个存钱的方法
- getAccount():显示账户余额的方法。
写一个内部类Transfer,实现Runnable接口
在run方法中实现向账户存钱的功能。
同步方法就是用synchronized关键字修饰的方法。
JDK为每个JAVA对象配置了内置锁,如果方法使用synchronized关键字修饰,内置锁就会保护整个方法。
3.代码详解
SynchronizedBankFrame
package com.xiaoxuzhu; import java.awt.BorderLayout; import java.awt.EventQueue; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.border.EmptyBorder; import javax.swing.JButton; import javax.swing.JScrollPane; import javax.swing.JTextArea; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import java.awt.GridLayout; import javax.swing.JLabel; import javax.swing.SwingConstants; import java.awt.Font; import javax.swing.UIManager; /** * Description: * * @author xiaoxuzhu * @version 1.0 * * <pre> * 修改记录: * 修改后版本 修改人 修改日期 修改内容 * 2022/5/14.1 xiaoxuzhu 2022/5/14 Create * </pre> * @date 2022/5/14 */ public class SynchronizedBankFrame extends JFrame { /** * */ private static final long serialVersionUID = 2671056183299397274L; private JPanel contentPane; private JTextArea thread1TextArea; private JTextArea thread2TextArea; /** * Launch the application. */ public static void main(String[] args) { try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel"); } catch (Throwable e) { e.printStackTrace(); } EventQueue.invokeLater(new Runnable() { public void run() { try { SynchronizedBankFrame frame = new SynchronizedBankFrame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public SynchronizedBankFrame() { setTitle("使用Synchronized实现线程同步"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(new BorderLayout(0, 0)); JPanel buttonPanel = new JPanel(); contentPane.add(buttonPanel, BorderLayout.SOUTH); JButton startButton = new JButton("开始存钱"); startButton.setFont(new Font("微软雅黑", Font.PLAIN, 16)); startButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_button_actionPerformed(arg0); } }); buttonPanel.add(startButton); JPanel processPanel = new JPanel(); contentPane.add(processPanel, BorderLayout.CENTER); processPanel.setLayout(new GridLayout(1, 2, 5, 5)); JPanel thread1Panel = new JPanel(); processPanel.add(thread1Panel); thread1Panel.setLayout(new BorderLayout(0, 0)); JLabel thread1Label = new JLabel("一号线程"); thread1Label.setFont(new Font("微软雅黑", Font.PLAIN, 16)); thread1Label.setHorizontalAlignment(SwingConstants.CENTER); thread1Panel.add(thread1Label, BorderLayout.NORTH); JScrollPane thread1ScrollPane = new JScrollPane(); thread1Panel.add(thread1ScrollPane, BorderLayout.CENTER); thread1TextArea = new JTextArea(); thread1TextArea.setFont(new Font("微软雅黑", Font.PLAIN, 16)); thread1ScrollPane.setViewportView(thread1TextArea); JPanel thread2Panel = new JPanel(); processPanel.add(thread2Panel); thread2Panel.setLayout(new BorderLayout(0, 0)); JLabel thread2Label = new JLabel("二号线程"); thread2Label.setFont(new Font("微软雅黑", Font.PLAIN, 16)); thread2Label.setHorizontalAlignment(SwingConstants.CENTER); thread2Panel.add(thread2Label, BorderLayout.NORTH); JScrollPane thread2ScrollPane = new JScrollPane(); thread2Panel.add(thread2ScrollPane, BorderLayout.CENTER); thread2TextArea = new JTextArea(); thread2TextArea.setFont(new Font("微软雅黑", Font.PLAIN, 16)); thread2ScrollPane.setViewportView(thread2TextArea); } protected void do_button_actionPerformed(ActionEvent arg0) { Bank bank = new Bank(); Thread thread1 = new Thread(new Transfer(bank, thread1TextArea)); thread1.start(); Thread thread2 = new Thread(new Transfer(bank, thread2TextArea)); thread2.start(); } private class Transfer implements Runnable { private Bank bank; private JTextArea textArea; public Transfer(Bank bank, JTextArea textArea) {// 初始化变量 this.bank = bank; this.textArea = textArea; } public void run() { for (int i = 0; i < 10; i++) {// 向账户中存入10次钱 bank.deposit(10);// 向账户中存入10块钱 String text = textArea.getText();// 获得文本域中的文本 // 在文本域中显示账户中的余额 textArea.setText(text + "账户的余额是:" + bank.getAccount() + "\n"); } } } private class Bank { private int account = 100;// 每个账户的初始金额是100元 public synchronized void deposit(int money) {// 向账户中存入money元 account += money; } public int getAccount() {// 查询账户余额 return account; } } }
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