package cn.usst.DataTest6; /**
* 设计四个线程，当中共两个线程每次对j添加1，另外两个线程每次对j降低1。循环100次，写出程序。
* @
*
*/
public class DataTest6 {
private int j;
public static void main(String[] args) {
DataTest6 dt = new DataTest6();
Inc inc = dt.new Inc();
Dec dec = dt.new Dec(); for(int i=0;i < 2; i++){
Thread t = new Thread(inc);
t.start();
t = new Thread(dec);
t.start();
}
} class Inc implements Runnable{
public void run() {
for(int i=0; i<100; i++){
inc();
}
}
} class Dec implements Runnable{
public void run() {
for(int i=0; i<100; i++){
dec();
}
}
} private synchronized void inc() {
j++;
System.out.println(Thread.currentThread().getName() + " +inc: " + j);
} private synchronized void dec() {
j--;
System.out.println(Thread.currentThread().getName() + " -dec: " + j);
}
}