写两个线程一个输出偶数一个输出奇数Java

在Java中，你可以创建两个线程分别处理打印奇数和偶数的任务。这里是一个简单的例子，使用`Thread`类和`synchronized`关键字来防止竞态条件：

public class PrintNumber {
    private static int counter = 0;
    private static final Object lock = new Object();

    public class OddThread extends Thread {
        @Override
        public void run() {
            while (true) {
                synchronized (lock) {
                    if (counter % 2 != 0) {
                        System.out.println(Thread.currentThread().getName() + ": " + (counter++));
                        lock.notify();
                    } else {
                        try {
                            lock.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }
    }

    public class EvenThread extends Thread {
        @Override
        public void run() {
            while (true) {
                synchronized (lock) {
                    if (counter % 2 == 0) {
                        System.out.println(Thread.currentThread().getName() + ": " + (counter++));
                        lock.notify();
                    } else {
                        try {
                            lock.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }
    }

    public static void main(String[] args) {
        OddThread oddThread = new OddThread();
        EvenThread evenThread = new EvenThread();
        oddThread.start();
        evenThread.start();
    }
}