创建10个学生对象存入Collection集合中

package com.itheima7.ArrayList01;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class ArraylestDemo03 {
    public static void main(String[] args) {
        Collection<Student> st=new ArrayList<>();
        st.add(new Student("张三",23,91));
        st.add(new Student("李四",25,91));
        st.add(new Student("张五",26,93));
        st.add(new Student("张三",27,93));
        st.add(new Student("张三",28,83));
        st.add(new Student("张三",23,87));
        st.add(new Student("张三",21,91));
        st.add(new Student("张三",23,97));
        st.add(new Student("张三",23,82));
        st.add(new Student("张三",23,88));
        System.out.println(extracted(st));
        geimin(st);
        fail(st);
    }
    public static Student extracted(Collection<Student> st) {//构造一个方法，参数类型 Student
        Iterator<Student> it = st.iterator(); //创建迭代器
        Student st1=null;//给定一个空的Student用于储存需要返回的st1
        int max=0;
        while (it.hasNext()){  //判断下一个是否为空
           Student stu = it.next();   //stu储存当前值 并把指针指向下一个值
            if (max< stu.getScore()){//循环判断当前学生分数是否大于max
                max=stu.getScore();//大于就赋值给max
                st1 =stu;    //并且也把值赋给需要返回的st1
            }
        }
        return st1;//Student 內型的返回值st1
    }
  public static void  geimin(Collection<Student> st){
      Iterator<Student> it = st.iterator();
      int max=0;
      while (it.hasNext()){
          Student next = it.next();
          max+=next.getScore();
      }
      System.out.println("总分是："+max+"平均分"+max/10.0);
  }
public static void fail(Collection<Student> st){
    Iterator<Student> it = st.iterator();
    int count=0;
    while (it.hasNext()){
        Student next = it.next();
        if (next.getScore()<60){
            count++;
        }
    }
    System.out.println(count);
}

}

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

    public Student() {
    }

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

    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;
    }

    public int getScore() {
        return score;
    }

    public void setScore(int score) {
        this.score = score;
    }

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

标签：10,int,Collection,st,add,Student,new,存入,public
来源： https://www.cnblogs.com/wukaijianyue/p/16295693.html