要求线程A输出一个奇数数，接着线程B输出一个偶数，如此交叉输出100以内的所有奇偶数。为什么输出的开始的时候会有2个0，要怎么改？

Z时代
2024-01-10
分类：技术分享

public class Demo01 implements Runnable {

static Object obj = new Object();
static int i = 0;

@Override
public void run() {
for (; i < 101; i++) {
synchronized (obj) {
obj.notify();
System.out.println(Thread.currentThread().getName()+":"+i);
try {
obj.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}

}

public class Test {

public static void main(String[] args) {
Demo01 d = new Demo01();
Thread c = new Thread(d);
Thread c1 = new Thread(d);
c1.start();
c.start();
}

}

图片说明

更改后可以了

public class TestThread implements Runnable {
static Object obj = new Object();
int i;
public TestThread(int i) {
this.i = i;
}
@Override
public void run() {
for (int j = i; j < 101; j += 2) {
synchronized (obj) {
obj.notify();
System.out.println("     " + Thread.currentThread().getName() + "   " + j);
try {
obj.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}

public class Test {
public static void main(String[] args) {
TestThread tt0 = new TestThread(0);
TestThread tt1 = new TestThread(1);
Thread A = new Thread(tt0);
Thread B = new Thread(tt1);
A.start();
B.start();
}
}