改进了循环，但还是出现迭代器错误Improved loops, but still iterator errors

package zh.codegym.task.task08.task0814;

import java.util.Collections;
import java.util.HashSet;
import java.util.Random;
import java.util.Set;

/*
大于 10？你不适合我们
*/

public class Solution {
    public static HashSet<Integer> createSet() {
        // 在此编写你的代码
        HashSet<Integer> integerSet = new HashSet<>();
        Random random = new Random();
        integerSet.add(random.nextInt(100) + 1);
        for (int i = 0; i < 19; i++) {
            int number = random.nextInt(100) + 1;
            if (!integerSet.contains(number)) {
                integerSet.add(number);
            } else {
                i--;
            }
        }
        return integerSet;
    }

    public static HashSet<Integer> removeAllNumbersGreaterThan10(HashSet<Integer> set) {
        // 在此编写你的代码
        set.removeIf(integer -> integer > 10);
        return set;
    }

    public static void main(String[] args) {
       /*
        HashSet<Integer> hashSet = createSet();
        System.out.println("删除前");
        System.out.println(hashSet);
        System.out.println("删除后");
        System.out.println(removeAllNumbersGreaterThan10(hashSet));
        */
    }
}

public static HashSet<Integer> removeAllNumbersGreaterThan10(HashSet<Integer> set) {
        // 在此编写你的代码
        HashSet<Integer> integers = new HashSet<>();
        for (int a: set) {
            if (a<=10){
                integers.add(a);
            }
        }
        return integers;
    }

public static Set<Integer> removeAllNumbersGreaterThan10(Set<Integer> set) {
    set.removeIf(integer -> integer > 10);
    return set;
}

public static void main(String[] args) {
    for (Integer s : removeAllNumbersGreaterThan10(createSet())) {
        System.out.println(s);
    }
}