分析以下需求,并用代码实现
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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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