day09随机点名案例封装实现

package com.tedu.demo;

import java.util.ArrayList;

import org.omg.CosNaming.NamingContextExtPackage.AddressHelper;

public class CallName {

    /**
     * 
     */
    public static void main(String[] args) {
        ArrayList<Student> array = new ArrayList<Student>();
        addStudents(array);
        printStudent(array);
        randomStudent(array);

    } 
    
    //生成随机数，产生随机姓名
    public static void randomStudent(ArrayList<Student> array){
        int index = (int)(Math.random()*array.size());
        Student s = array.get(index);
        System.out.println(s.getName()+" "+s.getAge());
    }
    
    //遍历学生信息
    public static void printStudent(ArrayList<Student> array){
        for(int i=0;i<array.size();i++){
            Student s = array.get(i);
            System.out.println(s.getAge()+" "+s.getName());
        }
    }
    
    //添加学生信息
    public static void addStudents(ArrayList<Student> array){
        Student s1 = new Student();
        s1.setAge(201);
        s1.setName("张三1");
        
        Student s2 = new Student();
        s2.setAge(202);
        s2.setName("张三2");
        
        Student s3 = new Student();
        s3.setAge(203);
        s3.setName("张三3");
        
        Student s4 = new Student();
        s4.setAge(204);
        s4.setName("张三4");
        
        Student s5 = new Student();
        s5.setAge(205);
        s5.setName("张三5");
        
        array.add(s5);
        array.add(s4);
        array.add(s3);
        array.add(s2);
        array.add(s1);
        
    }

}

package com.tedu.demo;

public class Student {
    /*
     * 定义私有成员变量
     *   姓名，年龄
     */
    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;
    }
    
}