package com.com.aaa.addreduceThread;

public class ThreadDemo {
    private int j=1;

    //每次新增1
    private synchronized void ad(){
        j++;
        System.out.println("新增"+j);
    }

    //每次減少1
    private synchronized void red(){
        j--;
        System.out.println("減少"+j);
    }

    private
 
 class Add implements Runnable{
        @Override
        public void run() {
            for (int i=0;i<5;i++){
                ad();
            }
        }
    }

    private class Reduce implements Runnable{
        @Override
        public void run() {
            for (int i=0;i<5;i++){
                red
 
();
            }
        }
    }

    public static void main(String[] args) {
        ThreadDemo td=new ThreadDemo();
        Thread t=null;
        Add a=td.new Add();
        Reduce r=td.new Reduce();
        for (int i=0;i<2;i++){
            t=new Thread(a);
            t.start();
            t=
 
new Thread(r);
            t.start();
        }
    }
}

執行結果：