为什么我得到不规则的输出？ [英] Why I am getting an irregular output?

问题描述

包核心; 
 
公共类MT3 {
 public static void main（String args []）{
 Account acc1 = new Account（）; 
 //帐户acc2 =新帐户（）; 
 AThread ath1 =新AThread（acc1，A）; 
 BThread ath2 =新的BThread（acc1，B）; 
} 
} 
类帐户{
 public synchronized void withdraw（）{
 for（int i = 0; i< 5; i ++）{
 System.out.println（Withdraw \t：+ Thread.currentThread（）。getName（））; 
 try {
 Thread.sleep（500）; 
} catch（例外e）{
 e.printStackTrace（）; 
} 
} 
} void deposite（）{
 for（int i = 0; i< 5; i ++）{
 System.out.println（Deposite \t：+ Thread.currentThread（）的getName（））; 
 try {
 Thread.sleep（500）; 
} catch（例外e）{
 e.printStackTrace（）; 
} 
} 
} 
} 
类AThread实现Runnable {
 Account acc; 
 public AThread（Account acc，String tname）{
 this.acc = acc; 
线程t1 =新线程（this，tname）; 
 t1.start（）; 
} 
 public void run（）{
 acc.withdraw（）; 
} 
} 
类BThread实现Runnable {
 Account acc; 
 public BThread（Account acc，String tname）{
 this.acc = acc; 
线程t2 =新线程（this，tname）; 
 t2.start（）; 
} 
 public void run（）{
 acc.deposite（）; 
} 
} 

我的尝试：



我使用的是单个对象，撤销方法是同步的，我无法弄清楚不规则输出的原因。

解决方案

< blockquote>你正在试验我们称之为'竞争条件'

竞争条件 - 维基百科 [ ^ ]

package core;

public class MT3 {
public static void main(String args[]) {
	Account acc1 = new Account();
//	Account acc2 = new Account();
	AThread ath1 = new AThread(acc1, "A");
	BThread ath2 = new BThread(acc1, "B");
}
}
class Account{
	public  synchronized void withdraw() {
		for (int i = 0; i<5; i++) {
			System.out.println("Withdraw \t:"+Thread.currentThread().getName());
			try {
				Thread.sleep(500);
			}catch(Exception e) {
				e.printStackTrace();
			}
		}
	}  void deposite(){
		for (int i=0;i<5;i++) {
			System.out.println("Deposite \t:"+Thread.currentThread().getName());
			try {
				Thread.sleep(500);
			}catch(Exception e) {
				e.printStackTrace();
			}
		}
	}
}
class AThread implements Runnable{
	Account acc;
	public AThread(Account acc, String tname) {
		this.acc=acc;
		Thread t1 = new Thread(this,tname);
		t1.start();
	}
	public void run() {
		acc.withdraw();
	}
}
class BThread implements Runnable{
	Account acc;
	public BThread(Account acc, String tname) {
		this.acc=acc;
		Thread t2 = new Thread(this,tname);
		t2.start();
	}
	public void run() {
		acc.deposite();
	}
}

What I have tried:

I am using single object and the withdraw method is sync, I can't figure out the reasin for irregular output.

解决方案

You are experimenting what we call a 'race condition'
Race condition - Wikipedia[^]

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