多线程死锁示例

死锁意思就是访问a线程定义了同步代码块locka，访问b线程定义了同步代码块lockb，这样当a线程要访问b，b线程也要访问a，这样就导致了死锁的出现

class Test implements Runnable {
    private boolean flag;
    public Test(boolean flag) {
        this.flag=flag;
    }
    @Override
    public void run() {
        if(flag){
            while (true) {
                synchronized (MyLock.locka) {
                    System.out.println("if locka");
                    synchronized (MyLock.lockb) {
                        System.out.println("if lockb");
                    }
                }
            }
        }else{
            while (true) {
                synchronized (MyLock.lockb) {
                    System.out.println("else lockb");
                    synchronized (MyLock.locka) {
                        System.out.println("else locka");
                    }
                }
            }
        }
    }
}
class MyLock{
    static Object locka=new Object();
    static Object lockb=new Object();
}
public class ThreadTest{
    public static void main(String args[]){
        System.out.println("111");
        Thread thread1=new Thread(new Test(true));
        Thread thread2=new Thread(new Test(false));
        thread1.start();
        thread2.start();
    }
}