JAVA，筛选集合中的随机数，得出偶数

Posted 2021-06-24 圆觉

代码如下：

package com.java.day06;

import java.util.ArrayList;
import java.util.Random;

// 筛选集合中的随机数,得出偶数
public class ArrayListReturn {
    public static void main(String[] args) {
        ArrayList<Integer> arrayList = numberSet(20);
        System.out.println(arrayList);
        ArrayList<Integer> evenNumber = filterSet(arrayList);
        System.out.println(evenNumber);
    }

    // 产生数字大集合方法
    public static ArrayList<Integer> numberSet(int loopNumber) {
        ArrayList<Integer> numberList = new ArrayList<>();
        Random random = new Random();
        for (int i = 0; i < loopNumber; i++) {
            Integer number = random.nextInt(100) + 1;
            numberList.add(number);
        }
        return numberList;
    }

    // 过滤数字方法
    public static ArrayList<Integer> filterSet(ArrayList<Integer> integerArrayList) {

        ArrayList<Integer> intArray = new ArrayList<>();
        for (int i = 0; i < integerArrayList.size(); i++) {
            int num = integerArrayList.get(i);
            if (num % 2 == 0) {
                intArray.add(num);
            }
        }
        return intArray;

    }
}