Java随机点名（利用集合）

project.java

package com.sxt;

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

public class project {
    public static void main(String[] args){
        ArrayList<Person> person = new ArrayList<>();
        addPerson(person);
        printPerson(person);
        System.out.println("——————————————————————");
        randPerson(person);
    }
    public static void addPerson(ArrayList<Person> person){
        Person p = new Person();
        p.name = "张三";
        p.age = 12;
        p.sex = "男";

        Person p1 = new Person();
        p1.name = "李四";
        p1.age = 15;
        p1.sex = "男";

        Person p2 = new Person();
        p2.name = "王五";
        p2.age = 18;
        p2.sex = "男";

        person.add(p);
        person.add(p1);
        person.add(p2);
    }
    public static void printPerson(ArrayList<Person> person){
        for(int i=0;i<person.size();i++){
            System.out.println(person.get(i).name + person.get(i).age + person.get(i).sex);
        }
    }
    public static void randPerson(ArrayList<Person> person){
        Random random = new Random();
        int index = random.nextInt(person.size());
        System.out.println(person.get(index).name + person.get(index).age + person.get(index).sex);
    }
}

Person.java

package com.sxt;

public class Person {
    String name;
    int age;
    String sex;
}