Multi-threading 6 (Simulasi deposit dalam sistem perbankan)
1. Topik
Simulasikan sistem perbankan mudah dan gunakan dua benang berbeza untuk mendepositkan wang ke dalam akaun yang sama.
Pelaksanaan: Gunakan kata kunci yang disegerakkan untuk mengubah suai kaedah penjimatan wang menjadi segerak.
2. Idea penyelesaian masalah
Buat kelas: SynchronizedBankFrame, warisi kelas JFrame
Tulis Bank kelas dalaman
Definisi Pembolehubah akaun untuk mewakili akaun.
deposit(): Kaedah untuk mendepositkan wang
getAccount(): Kaedah untuk memaparkan baki akaun.
Tulis Pemindahan kelas dalaman untuk melaksanakan antara muka Runnable
Dalam kaedah run, laksanakan fungsi mendepositkan wang ke dalam akaun.
Kaedah penyegerakan ialah kaedah yang diubah suai dengan kata kunci yang disegerakkan.
JDK mengkonfigurasi kunci terbina dalam untuk setiap objek JAVA Jika kaedah diubah suai dengan kata kunci yang disegerakkan, kunci terbina dalam akan melindungi keseluruhan kaedah.
3. Penjelasan kod terperinci
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 class="brush:php;toolbar:false">
* 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
*
Salin selepas log masuk
* @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;
}
}
}
Atas ialah kandungan terperinci Bagaimanakah Java menggunakan multi-threading untuk mensimulasikan masalah mendepositkan wang dalam sistem bank?. Untuk maklumat lanjut, sila ikut artikel berkaitan lain di laman web China PHP!
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