java在1--100之间随机产生数字并统计偶数的个数和输出

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

public class 集合循环偶数 {
    public static void main(String[] args) {
        ArrayList biglist = new ArrayList<>();
        Random num = new Random();
        for (int i = 0; i < 20; i++) {
            int sum = num.nextInt(100) + 1;
            biglist.add(sum);
        }
        ArrayList smalllist = getsmalllist(biglist);
        System.out.println("产生的偶数个数为:"+smalllist.size());
        for (int i = 0; i < smalllist.size(); i++) {
            System.out.println(smalllist.get(i));
        }
    }
    public static ArrayListgetsmalllist(ArrayList biglist) {
        ArrayList smalllist=new ArrayList();
        for(int i=0;i