儿童节，托儿所。

package ym.com.yjc;

/**

• 此类用于演示死锁 A B 俩各类 分别有一个 money 属性 如果 A 增加 100 则 b 减 100 相反 b+100 a-100
  */
  public class TestLock {
  public static void main(String[] args) {
  A a = new A();
  B b = new B();
  DeadLockDemo deadLockDemo = new DeadLockDemo(a, b, true);
  deadLockDemo.start();
  DeadLockDemo deadLockDemo1 = new DeadLockDemo(a, b, false);
  deadLockDemo1.start();

  }

}

class DeadLockDemo extends Thread {
A a;
B b;

public DeadLockDemo(A a, B b, boolean flag) {
this.a = a;
this.b = b;
this.flag = flag;
}

boolean flag;

@Override
public void run() {
if (flag) {
synchronized (a) {
a.save();
synchronized (b) {
b.minus();

}
}

} else {
synchronized (b) {
b.save();
synchronized (a) {
a.minus();

}
}
}
}
}

class A {
public int a;

public void save() {

a = a + 100;
System.out.println("a=" + a);
}

public void minus() {
a = a - 100;
System.out.println("a=" + a);
}
}

class B {
public int b;

public void save() {

b = b + 100;
System.out.println("b=" + b);
}

public void minus() {
System.out.println("b=" + b);
b = b - 100;
}
}