ArrayList

lsswudi 2021-08-04 原文

使用ArrayList存储学生并遍历

学生类为

package com.itheima_01;
 
public class Student {
 
    private int age;
    private String name;
 
 
 
    public Student() {
        System.out.println("无参构造方法");
    }
    public Student(String name,int age) {
        this.name = name;
        this.age = age;
    }
    public void setName(String n) {
        name = n;
    }
 
    public String getName() {
        return name;
    }
 
    public void setAge(int a) {
        age = a;
    }
 
    public int getAge() {
        return age;
    }
 
}

测试类为

package com.itheima_01;
 
import java.util.ArrayList;
 
public class ArrayListTest02 {
    public static void main(String[] args) {
        //创建集合对象
        ArrayList<Student> array = new ArrayList<Student>();
        //创建学生对象
        Student s1 = new Student("林青霞",30);
        Student s2 = new Student("风清扬",20);
        Student s3 = new Student("大司马",50);
        //添加学生对象到集合
        array.add(s1);
        array.add(s2);
        array.add(s3);
 
        for(int i = 0;i<array.size();i++) {
            Student s = array.get(i);
            System.out.println(s.getName()+"----"+s.getAge());
        }
    }
 
 
}

————————————————————————————- —- – – – — – – – – — – – – — – – – — – – — – — – – — – – — – – – — – — – – — – — – – —

ArrayList存储学生对象并遍历案例键盘输入版

Studet类

package com.itheima03;
 
public class Student {
    private String name;
    private String age;
 
    public Student() {
 
    }
 
    public Student(String name, String age) {
        this.name = name;
        this.age = age;
    }
 
    public String getName() {
        return name;
    }
 
    public String getAge() {
        return age;
    }
    public  void setName(String name) {
        this.name = name;
 
    }
    public  void setAge(String age) {
        this.age = age;
    }
}

测试类

package com.itheima03;
 
import java.util.ArrayList;
import java.util.Scanner;
 
public class ArrayListTest03 {
    public static void main(String[] args) {
        ArrayList<Student> arr = new ArrayList<>();//创建集合对象
 
        for(int i = 0;i<3;i++) {
            addStudent(arr);
        }
 
        for(int i = 0;i<arr.size();i++) {
            Student x = arr.get(i);
            System.out.println(x.getName()+" "+x.getAge());
        }
 
 
 
 
 
 
    }
    public static void addStudent(ArrayList<Student> arr) {
        Scanner sc = new Scanner(System.in);       //键盘录入学生需要的数据
 
 
        System.out.println("请输入学生姓名");
        String name = sc.nextLine();
 
        System.out.println("请输入学生年龄");
        String age = sc.nextLine();
 
 
        //创建学生对象，把键盘录入的数据赋值给学生对象的成员变量
        Student s = new Student();
        s.setName(name);
        s.setAge(age);
        //往集合中添加学生对象
        arr.add(s);
    }
}