/**
*死锁例子：鱼和熊不可兼得
?*
*死锁形成的原因：多个线程各自占有一个资源，并且相互等待其他线程占有的资源才能运行，
*从而导致另个或者多个线程都在等待对方释放资源，都停止了执行。
*某一个同步代码块同时拥有“两个以上对象的锁”时，就可能会发生“死锁”的问题。
?*
*执行结果：两个线程一直阻塞，都在等在对方释放锁，结果导致死锁。
?*/
public class MyDead {
????public static void main(String[] args) throws InterruptedException {
Person personA = new Person(0, "猎人A");
Person personB = new Person(1, "猎人B");
????????personA.start();
????????personB.start();
????}
}
//熊掌
class Bear {
}
//鱼
class Fish {
}
//人
//保证资源只有一份
????public static Bear bear = new Bear();
????public static Fish fish = new Fish();
????int choose;
????String personName;
????public Person (int choose, String personName) {
????????this.choose = choose;
????????this.personName = personName;
????}
????@Override
????public void run() {
//捕猎
????????try {
????????????this.hunting();
????????} catch (InterruptedException e) {
????????????e.printStackTrace();
????????}
????}
//捕猎方法
????private void hunting() throws InterruptedException {
????????if (choose == 0) {
????????????synchronized (bear) {
System.out.println(personName + "想捕捉熊");
????????????????Thread.sleep(1000);
????????????????synchronized (fish) {
System.out.println(personName + "想捕捉鱼");
????????????????}
????????????}
????????} else {
????????????synchronized (fish) {
System.out.println(personName + "想捕捉鱼");
????????????????Thread.sleep(1000);
????????????????synchronized (bear) {
System.out.println(personName + "想捕捉熊");
????????????????}
????????????}
????????}
????}
}