死锁：同步锁中嵌套同步锁，导致锁无法释放
package com.jlong;
class ThreadTrain4 implements Runnable {
private static int count = 100;
public Object object = new Object();
public boolean flag = true;
@Override
public void run() {
if (flag) {
while (count > 0) {
synchronized (object) {
show();
}
}
} else {
while (count > 0) {
show();
}
}
}
public synchronized void show() {
synchronized (object){
if (count > 0) {
try {
Thread.sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName() + "出售的第" + (100 - count + 1) + "张票");
count--;
}
}
}
}
public class ThreadDemo4 {
public static void main(String[] args) throws InterruptedException {
ThreadTrain4 threadTrain = new ThreadTrain4();
Thread thread1 = new Thread(threadTrain);
Thread thread2 = new Thread(threadTrain);
thread1.start();
Thread.sleep(50);
threadTrain.flag = false;
thread2.start();
}
}