java创建一个HashSet对象，存储多个Student对象， for循环出每个元素，并计算学生总成绩

创建一个student对仔岁象，对象了有一个属性，又来表示每个人的成绩

public class Student {

private int score

public int getScore() {

return score

}

public void setScore(int score) {

this.score = score

}

}

实现类

import java.util.HashSet

import java.util.Set

public class AddScore {

private static Set<Student>set=new HashSet<Student>()

public static void main(String[] args) {

//创建4个student对象，将他们全部加到set集合中

Student s=new Student()

s.setScore(50)

set.add(s)

Student s2=new Student()

s2.setScore(54)

set.add(s2)

Student s3=new Student()

s3.setScore(68)

set.add(s3)

Student s4=new Student()

s4.setScore(60)

set.add(s4)

//实例化对象

AddScore add= new AddScore()

//调用方法，得山慧到总成念唯睁绩

int score=add.addScore(set)

//输出总成绩

System.out.println(score)

}

//该方法用来遍历set集合，得出总成绩

public int addScore(Set<Student>set){

int allScore=0

for (Student student : set) {

allScore+=student.getScore()

}

return allScore

}

}

public class Test {

public static void main(String[] args) {

Set<高裤备Student>set=new HashSet()

set.add(new Student(1))

set.add(new Student(2))

set.add(new Student(3))

for(Student s:set){

System.out.println(s)

}

Iterator <Student>it=set.iterator()

while(it.hasNext()){

Student ss=it.next()

System.out.println(ss)

}

}

}class Student{

int number

public Student(int number) {

super()

this.number = number

}

@Override

public String toString() {

return "纯锋Student [number=" + number + "]"

}

}

注意 set无序不重复

有几个类戚毁引入不要引入awt包

/橡唤羡/*********************Student

import java.util.Objects

public class Student {

public String name

public int age

Student(){}

Student(String name,int age){

this.name=name

this.age=age

}

public String toString(){//重写toString()

return "链段name: "+name+" age: "+age

}

public boolean equals(Object o) {//重写equals()

if (this == o) return true

if (o == null || getClass() != o.getClass()) return false

Student student = (Student) o

return age == student.age &&Objects.equals(name, student.name)

}

public int hashCode() {//重写hashCode()

return Objects.hash(name)+age

}

}

//********************StudentTest

import java.util.HashSet

public class StudentTest {

public static void main(String[] args) {

HashSet<Student>hs=new HashSet<>()

Student s1=new Student("zs",19)//s1

Student s2=new Student("zs",19)//s2

Student s3=new Student("ls"梁拍,19)//s3

hs.add(s1)//加入集合

hs.add(s2)//

hs.add(s3)//

//s1,s2，equals()返回true，s2不会加入集合

for(Student it:hs) {//遍历HasSet

System.out.println(it)

}

}

}

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