Day_11【集合】扩展案例3_打印最高分的学员姓名、年龄、成绩，打印10个学生的总成绩和平均分，打印不及格的学员信息及数量

分析以下需求，并用代码实现

•  1.定义Student类
   属性:
   	姓名：String name
   	年龄：int age
   	成绩：int score
   行为:
   	空参构造方法
   	有参构造方法
   	set和get方法
   	toString方法
   2.定义测试类,进行测试
   (1)创建10个学生对象存入ArrayList集合中
   (2)打印最高分的学员姓名、年龄、成绩		[要求封装1个方法  参数是集合对象   返回值类型为Student]
   (3)打印10个学生的总成绩和平均分		[要求封装两个方法完成]
   (4)打印不及格的学员信息及数量			[要求封装一个方法完成]
  

代码

package com.itheima3;

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

	public Student() {
		super();
		// TODO Auto-generated constructor stub
	}

	public Student(String name, int age, int score) {
		super();
		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;
	}

	/*
	 * toString方法：public String toString()
	 * 作用：返回此对象本身（它已经是一个字符串！）
	 */
	@Override
	public String toString() {
		return "Student [name:"+name+" age:"+age+" score:"+score+"]";
	}
}

package com.itheima3;

import java.util.ArrayList;
import java.util.Random;

public class Test3 {
	public static void main(String[] args) {
		//创建集合对象
		ArrayList<Student> list = new ArrayList<Student>();

		//创建元素对象
		Student s1 = new Student("张三",18,30);
		Student s2 = new Student("李四",19,50);
		Student s3 = new Student("王五",20,30);
		Student s4 = new Student("赵六",18,86);
		Student s5 = new Student("周吴",18,75);
		Student s6 = new Student("郑王",19,60);
		Student s7 = new Student("大大",21,70);
		Student s8 = new Student("老八",19,90);
		Student s9 = new Student("哈哈",20,99);
		Student s10 = new Student("钱九",18,80);

		//将元素添加到集合中去
		list.add(s1);
		list.add(s2);
		list.add(s3);
		list.add(s4);
		list.add(s5);
		list.add(s6);
		list.add(s7);
		list.add(s8);
		list.add(s9);
		list.add(s10);

		//调用方法
		Student maxStu = getMaxStudent(list);
		System.out.println("最高分的学员信息为："+maxStu);

		int sum = getSumScore(list);
		System.out.println(list.size()+"名学员的总成绩为："+sum);

		int avg = getAvgScore(list);
		System.out.println(list.size()+"名学员的平均成绩为："+avg);

		printFailStuInfo(list);
	}
	//打印最高分的学员姓名、年龄、成绩		[要求封装1个方法  参数是集合对象   返回值类型为Student]
	public static Student getMaxStudent(ArrayList<Student> list) {
		Student s = list.get(0);
		for(int i = 0;i < list.size();i++) {
			if(list.get(i).getScore() > s.getScore()) {
				s = list.get(i);
			}
		}
		return s;
	}

	//打印10个学生的总成绩
	public static int getSumScore(ArrayList<Student> list) {
		int sum = 0;
		for(int i = 0;i < list.size();i++) {
			Student s = list.get(i);
			sum += s.getScore();
		}
		return sum;
	}

	//打印10个学生的平均分
	public static int getAvgScore(ArrayList<Student> list) {
		int sum = getSumScore(list);
		return sum / list.size();
	}

	//打印不及格的学员信息及数量			[要求封装一个方法完成]
	public static void printFailStuInfo(ArrayList<Student> list) {
		int count = 0;
		System.out.println("不及格的学生为：");
		for(int i = 0;i < list.size();i++) {
			Student s = list.get(i);
			if(list.get(i).getScore() < 60) {
				System.out.println(list.get(i));
				count++;
			}
		}
		System.out.println("不及格的学生数量为："+count);
	}

}

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