多线程，案例生产者和消费者，对于里面的逻辑不清楚

//奶箱
package com.company;
public class Box {
    private int mike;
    private boolean state=false;//奶箱的状态   是否为满的

    public synchronized void put(int mike) {
        if (state) {
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        this.mike = mike;
        System.out.println("送奶员将第" + mike + "瓶奶放入奶箱中");
        state = true;
        notifyAll();
    }

    public synchronized void get() {
        if (!state) {
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("消费者获得第" + mike + "瓶奶");
        state = false;
        notifyAll();
    }
}
//生产者
package com.company;

public class Producer implements Runnable{
    private Box b;
    @Override
    public void run() {
        for(int i=1;i<=5;i++)
        {
            b.put(i);
        }
    }

    public Producer(Box b) {
        this.b = b;
    }
}
//消费者
package com.company;

public class Consunmer implements Runnable {
    private Box b;
    public Consunmer(Box b) {
        this.b = b;
    }
    @Override
    public void run() {
        while (true) {
            b.get();
        }
    }
}
//主函数
package com.company;

public class Main {
    public static void main(String[] args) {
        Box b = new Box();
        Consunmer consunmer = new Consunmer(b);
        Producer producer = new Producer(b);
        Thread t1 = new Thread(consunmer);
        Thread t2 = new Thread(producer);
        t1.start();
        t2.start();
    }
}

那个在Box类中的put和get方法如果剩下的放在else里面就结果不对，不懂那个逻辑，state为假的时候执行wait（）后面的代码就不会执行了嘛，这样的话加个else也是一样的呀

不加else：