JAVA计算1-100的和并输出， 用两种线程方式实现。

好的，这个问题可以直接回答。以下是两种线程方式的实现：

1. 继承Thread类的方式：

public class SumThread extends Thread {
    int sum = 0;
    int start, end;

    public SumThread(int start, int end) {
        this.start = start;
        this.end = end;
    }

    public void run() {
        for (int i = start; i <= end; i++) {
            sum += i;
        }
    }

    public int getSum() {
        return sum;
    }
}

public class Main {
    public static void main(String[] args) throws InterruptedException {
        SumThread t1 = new SumThread(1, 50);
        SumThread t2 = new SumThread(51, 100);
        
        t1.start();
        t2.start();
        
        t1.join();
        t2.join();
        
        int totalSum = t1.getSum() + t2.getSum();
        System.out.println("1-100的和为：" + totalSum);
    }
}

2. 实现Runnable接口的方式：

public class SumRunnable implements Runnable {
    int sum = 0;
    int start, end;

    public SumRunnable(int start, int end) {
        this.start = start;
        this.end = end;
    }

    public void run() {
        for (int i = start; i <= end; i++) {
            sum += i;
        }
    }

    public int getSum() {
        return sum;
    }
}

public class Main {
    public static void main(String[] args) throws InterruptedException {
        SumRunnable r1 = new SumRunnable(1, 50);
        SumRunnable r2 = new SumRunnable(51, 100);
        Thread t1 = new Thread(r1);
        Thread t2 = new Thread(r2);
        
        t1.start();
        t2.start();
        
        t1.join();
        t2.join();
        
        int totalSum = r1.getSum() + r2.getSum();
        System.out.println("1-100的和为：" + totalSum);
    }
}

希望能够帮助您！