為什么結果會出現負的情況？
public class MyThreadTest {
public static void main(String[] args) {
MyThread m=new MyThread();
Thread t1=new Thread(m,"線程1");
Thread t2=new Thread(m,"線程2");
Thread t3=new Thread(m,"線程3");
Thread t4=new Thread(m,"線程4");
t1.start();
t2.start();
t3.start();
t4.start();}
}class MyThread implements Runnable{
private int sum=10;
private Object lock=new Object();
@Overridepublic void run() {
while(sum>0) {
//鎖
synchronized (lock) {
System.out.println(Thread.currentThread().getName()+" "+sum);
sum--;
}
}
}
}
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