随机点名器练习--集合

Student.java

package com.yikuan.test;

public class Student {
    private String name;
    private int age;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}

CallName.java

package com.yikuan.test;

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

/**
 * 随机点名器
 * 1.创建一个集合，将学生对象存储到集合中
 * 2.总览所有学生信息，将存储到集合中的Student对象遍历出来
 * 3.随机一个学生，随机数作为索引到集合中去查找元素
 * @author Administrator
 *
 */
public class CallName {
    public static void main(String[] args) {
        //定义一个集合，存储学生对象
        ArrayList<Student> array = new ArrayList<Student>();
        addStudent(array);
        printStudent(array);
        System.out.println("点到的学生：---->------->----->");
        randomStudent(array);
    }
    /*定义一个方法，存储学生对象到集合中*/
    public static void addStudent(ArrayList<Student> array){
        Student s1 = new Student();
        s1.setName("李四");
        s1.setAge(14);
        Student s2 = new Student();
        s2.setName("李四2");
        s2.setAge(145);
        Student s3 = new Student();
        s3.setName("李四3");
        s3.setAge(146);
        Student s4 = new Student();
        s4.setName("李四4");
        s4.setAge(142);
        Student s5 = new Student();
        s5.setName("李四5");
        s5.setAge(143);
        
        array.add(s1);
        array.add(s2);
        array.add(s3);
        array.add(s4);
        array.add(s5);
    }
    /*遍历集合*/
    public static void printStudent(ArrayList<Student> array){
        for (int i = 0; i < array.size(); i++) {
            Student s = array.get(i);
            System.out.println(s.getName()+"...."+s.getAge());
        }
    }
    /*随机数生成学生信息*/
    public static void randomStudent(ArrayList<Student> array){
        Random r = new Random();
        int index = r.nextInt(array.size());
        Student s = array.get(index);
        System.out.println(s.getName());
    }
}