用java两个线程输出1-100

我可以回答这个问题。可以使用两个线程分别输出1-50和51-100的数字。具体实现可以使用synchronized关键字来保证线程安全。以下是示例代码：

public class PrintThread implements Runnable {
    private int start;
    private int end;
    private Object lock;

    public PrintThread(int start, int end, Object lock) {
        this.start = start;
        this.end = end;
        this.lock = lock;
    }

    @Override
    public void run() {
        synchronized (lock) {
            for (int i = start; i <= end; i++) {
                System.out.println(Thread.currentThread().getName() + ": " + i);
                lock.notifyAll();
                try {
                    if (i != end) {
                        lock.wait();
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

public class Main {
    public static void main(String[] args) {
        Object lock = new Object();
        PrintThread thread1 = new PrintThread(1, 50, lock);
        PrintThread thread2 = new PrintThread(51, 100, lock);
        new Thread(thread1, "Thread-1").start();
        new Thread(thread2, "Thread-2").start();
    }
}