将学生对象存到集合中转换成数组并遍历

题目

将学生对象存到集合中转换成数组并遍历

分析

使用 toArray(); 可以将集合转换成数组

程序代码

//学生类
package com.company.test;

public class Student {
    private String name;
    private int age;

    public Student() {
    }

    public Student(String name, int age) {
        this.name = name;
        this.age = 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;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

//主程序
package com.company.test;


import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class MyTest {
    public static void main (String[] args) {
        List list = new ArrayList();
        list.add(new Student("张三",22));
        list.add(new Student("李四",23));
        list.add(new Student("王五",34));
        Object[] obj = list.toArray();
        String s = Arrays.toString(obj);
        System.out.println(s);
        for (int i = 0; i < obj.length; i++) {
            Student str = (Student)obj[i];
            System.out.println(str);
        }
    }
}

运行结果