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本篇內(nèi)容主要講解“Java怎么利用多線程模擬銀行系統(tǒng)存錢(qián)問(wèn)題”,感興趣的朋友不妨來(lái)看看。本文介紹的方法操作簡(jiǎn)單快捷,實(shí)用性強(qiáng)。下面就讓小編來(lái)帶大家學(xué)習(xí)“Java怎么利用多線程模擬銀行系統(tǒng)存錢(qián)問(wèn)題”吧!
模擬一個(gè)簡(jiǎn)單的銀行系統(tǒng),使用兩個(gè)不同的線程向同一個(gè)賬戶存錢(qián)。
實(shí)現(xiàn):使用synchronized關(guān)鍵字,將存錢(qián)的方法修改成同步的。
創(chuàng)建一個(gè)類(lèi):SynchronizedBankFrame,繼承JFrame類(lèi)
寫(xiě)一個(gè)內(nèi)部類(lèi)Bank
定義一個(gè)account變量,來(lái)表示賬戶。
deposit():一個(gè)存錢(qián)的方法
getAccount():顯示賬戶余額的方法。
寫(xiě)一個(gè)內(nèi)部類(lèi)Transfer,實(shí)現(xiàn)Runnable接口
在run方法中實(shí)現(xiàn)向賬戶存錢(qián)的功能。
同步方法就是用synchronized關(guān)鍵字修飾的方法。
JDK為每個(gè)JAVA對(duì)象配置了內(nèi)置鎖,如果方法使用synchronized關(guān)鍵字修飾,內(nèi)置鎖就會(huì)保護(hù)整個(gè)方法。
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> * 修改記錄: * 修改后版本 修改人 修改日期 修改內(nèi)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實(shí)現(xiàn)線程同步"); 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("開(kāi)始存錢(qián)"); startButton.setFont(new Font("微軟雅黑", 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("一號(hào)線程"); thread1Label.setFont(new Font("微軟雅黑", 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("微軟雅黑", Font.PLAIN, 16)); thread1ScrollPane.setViewportView(thread1TextArea); JPanel thread2Panel = new JPanel(); processPanel.add(thread2Panel); thread2Panel.setLayout(new BorderLayout(0, 0)); JLabel thread2Label = new JLabel("二號(hào)線程"); thread2Label.setFont(new Font("微軟雅黑", 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("微軟雅黑", 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) {// 初始化變量 this.bank = bank; this.textArea = textArea; } public void run() { for (int i = 0; i < 10; i++) {// 向賬戶中存入10次錢(qián) bank.deposit(10);// 向賬戶中存入10塊錢(qián) String text = textArea.getText();// 獲得文本域中的文本 // 在文本域中顯示賬戶中的余額 textArea.setText(text + "賬戶的余額是:" + bank.getAccount() + "\n"); } } } private class Bank { private int account = 100;// 每個(gè)賬戶的初始金額是100元 public synchronized void deposit(int money) {// 向賬戶中存入money元 account += money; } public int getAccount() {// 查詢(xún)賬戶余額 return account; } } }
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