11.11光棍节

ArrayList

test类
package work;

import java.util.ArrayList;
import java.util.Scanner;

public class test {
public static void main(String[] args) {
ArrayList list = new ArrayList<>();
Scanner sc=new Scanner(System.in);
for(int i=0;i<3;i++){
Student s = new Student();

         System.out.println("请输入姓名");
         String name =sc.next();
         System.out.println("请输入年龄");
         int age =sc.nextInt();

         s.setAge(age);
         s.setName(name);
         list.add(s);
     }
    for(int i=0;i<list.size();i++){
        Student stu=list.get(i);
        System.out.println(stu.getAge()+" "+stu.getName());
    }
}

}

Student封装类
package work;

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

public Student() {
}

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

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

}

ArrayList作为一个容器 存储Student类里的成员 最后输出还要转为Student类
返回多个数据
test2类
package work;

import java.util.ArrayList;

public class test2 {
public static void main(String[] args) {
ArrayList list=new ArrayList<>();

    Phone p1=new Phone("小米",1000);
    Phone p2=new Phone("苹果",8000);
    Phone p3=new Phone("锤子",2999);

    list.add(p1);
    list.add(p2);
    list.add(p3);

    ArrayList<Phone> Phonelist=getPhone(list);
    for (int i = 0; i < Phonelist.size(); i++) {
        Phone P=Phonelist.get(i);

        System.out.println(P.getBrand()+","+P.getPrice());
    }
}
public static ArrayList<Phone> getPhone(ArrayList<Phone> list){
    ArrayList<Phone> phoneList=new ArrayList<>();
    for(int i=0;i<list.size();i++){
        Phone p=list.get(i);
        if(p.getPrice()<3000){
            phoneList.add(p);
        }
    }
    return phoneList;
}

}
java bean封装Phoen
package work;

public class Phone {
//品牌 价格
private String brand;
private int price;

public Phone() {
}

public Phone(String brand, int price) {
    this.brand = brand;
    this.price = price;
}

public String getBrand() {
    return brand;
}

public void setBrand(String brand) {
    this.brand = brand;
}

public int getPrice() {
    return price;
}

public void setPrice(int price) {
    this.price = price;
}

}