从HashSet<Double>中提取整数

import java.util.HashSet;

public class Main {
    public static void main(String[] args) {
        HashSet<Double> doubleSet = new HashSet<>();
        doubleSet.add(2.5);
        doubleSet.add(5.0);
        doubleSet.add(3.7);
        doubleSet.add(8.0);
        doubleSet.add(4.2);

        HashSet<Integer> integerSet = new HashSet<>();
        for (Double num : doubleSet) {
            int integer = num.intValue();
            if (integer == num) {
                integerSet.add(integer);
            }
        }

        System.out.println("提取出的整数为：");
        for (Integer num : integerSet) {
            System.out.println(num);
        }
    }
}