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public class Comuser {
       public static void main(String[] args) {
           Data data = new Data();        new Thread(()->{
               for (int i = 0; i < 20; i++) {
                   data.decrement();            }        },"顾客").start();        new Thread(()->{
               for (int i = 0; i < 20; i++) {
                   data.increment();            }        },"老板").start();    }}class Data{
       private int number = 0;    //+1    public synchronized void increment() {
   //同步方法锁的就是this        //有数据的时候就等待        if(number != 0) {
               try {
                   this.wait();            } catch (InterruptedException e) {
                   e.printStackTrace();            }        }        number++;        System.out.println(Thread.currentThread().getName()+"=>"+number);        this.notify();    }    //-1    public synchronized void decrement() {
           //没有数据就等待        if(number == 0) {
               try {
                   this.wait();            } catch (InterruptedException e) {
                   e.printStackTrace();            }        }        number--;        System.out.println(Thread.currentThread().getName()+"=>"+number);        this.notify();    }}

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