JAVA課程學習九:類訓練-學生管理實現
阿新 • • 發佈:2019-01-08
練習知識1:掌握類的建立,成員變數與方法的編寫
練習知識2:掌握類的例項化與成員、方法的呼叫
練習知識3:掌握面向物件思想,理解類的封裝與關聯關係
設計要求:
建立一個學生類(姓名,學號,3門課成績(英語,數學,語文),總分),類的方法:輸入,輸出,學生資料,根據總分排序,列印學生名次)
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("請輸入你要錄入的學生人數:");
int studentNum = in.nextInt();
System.out.println("===========================================================");
List<Student> list = new ArrayList<Student>();
for (int i=0;i<studentNum;i++) {
System.out.println("輸入學生的學號:");
String studentID = in.next();
System.out.println("輸入學生的姓名:");
String studentName = in.next();
System.out.println("輸入數學科目的成績:");
int math = in.nextInt();
System.out.println("輸入英語科目的成績:" );
int English = in.nextInt();
System.out.println("輸入語文科目的成績:");
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;
}
});
//遍歷輸出
for(Student student : list) {
System.out.println("學號:"+student.getStudentID()+"\t"+"姓名:"+student.getStudentName()+"\t"
+ "總分:"+student.getCourse().getSum());
}
}
}
/**
* @描述 學生類
* @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 課程類
* @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;
}
}
最終結果:
請輸入你要錄入的學生人數:
3
===========================================================
輸入學生的學號:
001
輸入學生的姓名:
小明
輸入數學科目的成績:
67
輸入英語科目的成績:
78
輸入語文科目的成績:
55
===========================================================
輸入學生的學號:
002
輸入學生的姓名:
小紅
輸入數學科目的成績:
89
輸入英語科目的成績:
99
輸入語文科目的成績:
90
===========================================================
輸入學生的學號:
003
輸入學生的姓名:
小白
輸入數學科目的成績:
78
輸入英語科目的成績:
67
輸入語文科目的成績:
55
===========================================================
最終排名:
學號:002 姓名:小紅 總分:278
學號:001 姓名:小明 總分:200
學號:003 姓名:小白 總分:200
覆蓋tostring方法輸出:
package 學生管理;
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("請輸入你要錄入的學生人數:");
int studentNum = in.nextInt();
System.out.println("===========================================================");
List<Student> list = new ArrayList<Student>();
for(int i=0;i<studentNum;i++) {
System.out.println("輸入學生的學號:");
String studentID = in.next();
System.out.println("輸入學生的姓名:");
String studentName = in.next();
System.out.println("輸入數學科目的成績:");
int math = in.nextInt();
System.out.println("輸入英語科目的成績:");
int English = in.nextInt();
System.out.println("輸入語文科目的成績:");
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("最終排名:");
//遍歷輸出
for(Student student : list) {
// System.out.println("學號:"+student.getStudentID()+"\t"+"姓名:"+student.getStudentName()+"\t"
// + "總分:"+student.getCourse().getSum());
System.out.println(student.toString());
}
}
}
/**
* @描述 學生類
* @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;
}
//重寫類的ToString方法
@Override
public String toString() {
String result = "學號:"+this.getStudentID()+"\t"+"姓名:"+this.getStudentName()+"\t"
+ "總分:"+this.getCourse().getSum();
return result;
}
}
/**
* @描述 課程類
* @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;
}
}