lock

1. 這裡的lock只需要一把鎖
   因為同時還要配合狀態 一起決定
2. 一定要在try裡面用 一定要unlock

public class Test {
    public static void main(String[] args) {
        //傳統版本
        AirConditional airConditional = new AirConditional();
        new Thread(()->{
            for (int i = 0; i < 5; i++) {
                airConditional.produce();
            }
        }).start();
        new Thread(()->{
            for (int i = 0; i < 5; i++) {
                airConditional.consume();
            }
        }).start();
    }
}
class AirConditional{
    int temp ;
    Lock lock = new ReentrantLock();
    Condition condition = lock.newCondition();

    public void produce(){
        try {
            lock.lock();
            while( temp != 0){
                condition.await();
            }
            temp++;
            System.out.println("生產後為"+temp);
            condition.signalAll();
        }catch (Exception e){

        }
        finally {
             lock.unlock();   
        }
    }
    public void consume(){
        try {
            lock.lock();
            while( temp != 1){
                condition.await();
            }
            temp--;
            System.out.println("消費後為"+temp);
            condition.signalAll();
        }catch (Exception e){

        }
        finally {
            lock.unlock();
        }
    }
}