java实现4个线程对一个公共变量修改

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JAVA多线程编程。用JAVA写一个多线程程序，如写四个线程，二个加1，二个对一个变量减一，输出。

package com.base;public class ThreadTest {public static int j = 0;public static void main(String[] args) {new ThreadTest_1().start();new ThreadTest_2().start();new ThreadTest_3().start();new ThreadTest_4().start();System.out.println(j);}public synchronized void deleteOne(){j --;}public synchronized void addOne(){j ++;}}class ThreadTest_1 extends Thread {@Overridepublic void run() {ThreadTest aTest = new ThreadTest();for (int i = 0; i < 5; i++) {aTest.deleteOne();}}}class ThreadTest_2 extends Thread {@Overridepublic void run() {new ThreadTest().deleteOne();}}class ThreadTest_3 extends Thread {@Overridepublic void run() {new ThreadTest().addOne();}}class ThreadTest_4 extends Thread {@Overridepublic void run() {new ThreadTest().addOne();}}

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