package desposit.money; public class DespositMoney { public static void main(String[] args) { Customer c1 = new Customer("第一个顾客",3); Customer c2 = new Customer("第二个顾客",10); Customer c3 = new Customer("第三个顾客",5); c1.start(); c2.start(); c3.start(); } } class Customer extends Thread{ private int time; String s; public Customer(String s,int time){ this.s = s; this.time = time; } public void run(){ while(true) { synchronized(this){ if(time>0) { Total.sum+=100; System.out.println(s+"存款100元,银行总共有存款"+Total.sum+"元"); try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } time --; } if(time ==0) { System.out.println(s+"存款结束"); break; } } } } } class Total { public static int sum = 0; }
运行结果不是从100,200,......,到1800,中间总有重复的数字,但最后的结果总和是1800
多個執行緒存取同一個物件時,加上synchronized(this)可以讓一個時間內只有一個執行緒處理,但你這裡new了3個物件。
我感覺要懷疑的你的eclipse了,我完全複製的程式碼,重新運行了一遍,結果是這樣的:
![](http://img.php.cn/upload/image/000/000/000/8f8825291b9b14b8746e82735ad4ea86-0.png)
沒有重複的數字,按照順序依次存錢啊,結果也是正確的