代码如下：

public class MyWork {
    public static void main(String[] args) {
        System.out.println("100以内的质数如下：");
        for (int num = 0; num <= 100; num++) {
            if (2 == num) {
                System.out.print(num + " ");
                continue;
            }
            for (int i = 2; i < num; i++) {
                if (0 == num % i) {
                    break;
                } else if (i == num - 1 && 0 != num % i) {
                    System.out.print(num + " ");
                }
            }
        }
        System.out.println();
    }
}