一个线程题目

[dlookhere]

用JAVA写4个线程，其中两个线程每次对J增加1，另外两个对J减少1，怎么写？

[cursor_wang]

public class ThreadTest1{
	private int j;
	public static void main(String args[]){
		ThreadTest1 tt=new ThreadTest1();
		Inc inc=tt.new Inc();
		Dec dec=tt.new Dec();
		for(int i=0;i<2;i++){
			Thread t=new Thread(inc);
			t.start();
		t=new Thread(dec);
		t.start();
		}
	}
	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);
	}
	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();
			}
		}
	}
}

[贝壳鱼]

class A {
static final B b;
public A() {
b = = new B();
}

public void executeIncrease() {
new Thread(new Runnable(){
public void run() {
while (true) {
try {
b.increaseJ();
Thread.sleep(500L);
} catch (Exception e) {e.printStackTrace();}
}
}
}).start();
}

public void executeReduce() {
new Thread(new Runnable(){
public void run() {
while (true) {
try {
b.reduceJ();
Thread.sleep(500L);
} catch (Exception e) {e.printStackTrace();}
}
}
}).start();
}


public static void main(String[] args) {
A a0 = new A()
a0.executeIncrease();
A a1 = new A();
a1.executeReduce();
}
}


class B {
int j;
public B() {
}
public void increaseJ() {
j++;
}
public void reduceJ() {
j--;
}
}


用两个线程不行吗

[wenzheng38]

楼上两位都是高手啊
学习下...

[token1984]

mark 学习中

[charmlin]

学习

[fige257]

两位高手