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  • JAVA ArrayList实现随机生成数字,并把偶数放入一个列表中

    package Code429;

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

    public class CodeArrayListPrint {
    public static void main(String[] args) {
    ArrayList<Integer> biglist = new ArrayList<>();
    Random random = new Random();
    for (int i = 0; i < 20; i++) {
    //循环20次,生成20个1~100的随机数

    biglist.add(random.nextInt(100)+1);
    }

    System.out.println(getsmallList(biglist));
    System.out.println(getsmallList(biglist).size());
    }
    //使用方法,把大列表中的偶数放入小列表当中
    public static ArrayList<Integer> getsmallList(ArrayList<Integer> biglist) {
    ArrayList<Integer> small = new ArrayList<>();
    for (int i = 0; i < biglist.size(); i++) {
    //判断大列表中的数,是否为偶数

    if (biglist.get(i) % 2 == 0) {
    small.add(biglist.get(i));
    }
    }
    return small;
    }
    }
    运行代码↓
     
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  • 原文地址:https://www.cnblogs.com/Ssinoo/p/10792345.html
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