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练习知识1:掌握类的创建,成员变量与方法的编写
练习知识2:掌握类的实例化与成员、方法的调用
练习知识3:掌握面向对象思想,理解类的封装与关联关系
设计要求:
建立一个学生类(姓名,学号,3门课成绩(英语,数学,语文),总分),类的方法:输入,输出,学生数据,根据总分排序,打印学生名次)
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.println("请输入你要录入的学生人数:");
int studentNum = in.nextInt();
System.out.println("===========================================================");
List<Student> list = new ArrayList<Student>();
for(int i=0;i<studentNum;i++) {
System.out.println("输入学生的学号:");
String studentID = in.next();
System.out.println("输入学生的姓名:");
String studentName = in.next();
System.out.println("输入数学科目的成绩:");
int math = in.nextInt();
System.out.println("输入英语科目的成绩:");
int English = in.nextInt();
System.out.println("输入语文科目的成绩:");
int chinese = in.nextInt();
Course course = new Course(math,English,chinese);
Student student = new Student(studentID,studentName,course);
list.add(student);
System.out.println("===========================================================");
}
//排序
list.sort(new Comparator<Student>() {
@Override
public int compare(Student o1, Student o2) {
if(o1.getCourse().getSum()>o2.getCourse().getSum())
return -1;
else
return 1;
}
});
//遍历输出
for(Student student : list) {
System.out.println("学号:"+student.getStudentID()+"\t"+"姓名:"+student.getStudentName()+"\t"
+ "总分:"+student.getCourse().getSum());
}
}
}
/**
* @描述 学生类
* @author iceyu
*
*/
class Student{
private String studentID;
private String studentName;
private Course course;
public Student() {}
public Student(String studentID,String studentName,Course course) {
this.course = course;
this.studentID = studentID;
this.studentName = studentName;
}
public String getStudentID() {
return studentID;
}
public void setStudentID(String studentID) {
this.studentID = studentID;
}
public String getStudentName() {
return studentName;
}
public void setStudentName(String studentName) {
this.studentName = studentName;
}
public Course getCourse() {
return course;
}
public void setCourse(Course course) {
this.course = course;
}
}
/**
* @描述 课程类
* @author iceyu
*
*/
class Course{
private int math;
private int English;
private int chinese;
private int sum;
public Course() {}
public Course(int math,int English,int chinese) {
this.math = math;
this.chinese = chinese;
this.English = English;
}
public int getSum() {
return this.chinese + this.English + this.math;
}
public void setSum(int sum) {
this.sum = sum;
}
public int getMath() {
return math;
}
public void setMath(int math) {
this.math = math;
}
public int getEnglish() {
return English;
}
public void setEnglish(int english) {
English = english;
}
public int getChinese() {
return chinese;
}
public void setChinese(int chinese) {
this.chinese = chinese;
}
}
最终结果:
请输入你要录入的学生人数:
3
===========================================================
输入学生的学号:
001
输入学生的姓名:
小明
输入数学科目的成绩:
67
输入英语科目的成绩:
78
输入语文科目的成绩:
55
===========================================================
输入学生的学号:
002
输入学生的姓名:
小红
输入数学科目的成绩:
89
输入英语科目的成绩:
99
输入语文科目的成绩:
90
===========================================================
输入学生的学号:
003
输入学生的姓名:
小白
输入数学科目的成绩:
78
输入英语科目的成绩:
67
输入语文科目的成绩:
55
===========================================================
最终排名:
学号:002 姓名:小红 总分:278
学号:001 姓名:小明 总分:200
学号:003 姓名:小白 总分:200
覆盖tostring方法输出:
package 学生管理;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.println("请输入你要录入的学生人数:");
int studentNum = in.nextInt();
System.out.println("===========================================================");
List<Student> list = new ArrayList<Student>();
for(int i=0;i<studentNum;i++) {
System.out.println("输入学生的学号:");
String studentID = in.next();
System.out.println("输入学生的姓名:");
String studentName = in.next();
System.out.println("输入数学科目的成绩:");
int math = in.nextInt();
System.out.println("输入英语科目的成绩:");
int English = in.nextInt();
System.out.println("输入语文科目的成绩:");
int chinese = in.nextInt();
Course course = new Course(math,English,chinese);
Student student = new Student(studentID,studentName,course);
list.add(student);
System.out.println("===========================================================");
}
//排序
list.sort(new Comparator<Student>() {
@Override
public int compare(Student o1, Student o2) {
if(o1.getCourse().getSum()>o2.getCourse().getSum())
return -1;
else
return 1;
}
});
System.out.println("最终排名:");
//遍历输出
for(Student student : list) {
// System.out.println("学号:"+student.getStudentID()+"\t"+"姓名:"+student.getStudentName()+"\t"
// + "总分:"+student.getCourse().getSum());
System.out.println(student.toString());
}
}
}
/**
* @描述 学生类
* @author iceyu
*
*/
class Student{
private String studentID;
private String studentName;
private Course course;
public Student() {}
public Student(String studentID,String studentName,Course course) {
this.course = course;
this.studentID = studentID;
this.studentName = studentName;
}
public String getStudentID() {
return studentID;
}
public void setStudentID(String studentID) {
this.studentID = studentID;
}
public String getStudentName() {
return studentName;
}
public void setStudentName(String studentName) {
this.studentName = studentName;
}
public Course getCourse() {
return course;
}
public void setCourse(Course course) {
this.course = course;
}
//重写类的ToString方法
@Override
public String toString() {
String result = "学号:"+this.getStudentID()+"\t"+"姓名:"+this.getStudentName()+"\t"
+ "总分:"+this.getCourse().getSum();
return result;
}
}
/**
* @描述 课程类
* @author iceyu
*
*/
class Course{
private int math;
private int English;
private int chinese;
private int sum;
public Course() {}
public Course(int math,int English,int chinese) {
this.math = math;
this.chinese = chinese;
this.English = English;
}
public int getSum() {
return this.chinese + this.English + this.math;
}
public void setSum(int sum) {
this.sum = sum;
}
public int getMath() {
return math;
}
public void setMath(int math) {
this.math = math;
}
public int getEnglish() {
return English;
}
public void setEnglish(int english) {
English = english;
}
public int getChinese() {
return chinese;
}
public void setChinese(int chinese) {
this.chinese = chinese;
}
}