max以内的所有素数为

import java.util.ArrayList;

interface SingleNumInterface {
int[] getSingleNums(int max);
}

public class Demo {

public static void main(String[] args) {
    SingleNumInterface sni = e -> {
        ArrayList<Integer> list = new ArrayList<>();
        if (e == 1) {
            return new int[] { 1 };
        }
        for (int i = 1; i <= e; i++) {
            boolean flag = true;// 默认是素数
            for (int j = 2; j <= Math.sqrt(i); j++) {
                if (i % j == 0) {
                    flag = false;// 能整除
                }
            }
            if (flag) {
                list.add(i);
            }
        }
        int result[] = new int[list.size()];
        for (int i = 0; i < result.length; i++) {
            result[i] = list.get(i);
        }
        return result;
    };

    int max = 99;
    System.out.println(max + "以内的所有素数为：");
    for (int num : sni.getSingleNums(max)) {
        System.out.print(num + " ");
    }

}

}