这个线程案例该怎么敲？

Question

怎么把线程分别分配给每段数据打印输出？
又怎么保证不重复数字？

Answer 1

预先将这20分为五组，每个线程各自打印各自的数。

代码如下：

public class MyThread implements Runnable {

    public int[] nums;
    public int count;

    public MyThread(int[] nums, int count) {
        this.nums = nums;
        this.count = count;
    }

    public static void main(String[] args) {
        int n = 20;
        int m = 5;
        int size = n / m;

        int[][] totalNums = new int[m][size];

        for (int i = 0; i < n; i++) {
            totalNums[i / size][i % size] = i+1;
        }

        Thread[] threads = new Thread[m];
        for (int i = 0; i < m; i++) {
            int[] mums = totalNums[i];
            MyThread myThread = new MyThread(mums, i + 1);
            threads[i] = new Thread(myThread);
        }
        for (int i = 0; i < m; i++) {
            threads[i].start();
        }

    }

    @Override
    public void run() {
        for (int num : nums) {
            System.out.println("第" + count + "个线程：" + num);
        }
    }
}