course.java

java编制的成绩管理系统

import java.util.*;

public class Course {
	private String StudentName;
	private HashMap<String, Score> mScores=new HashMap<String, Score>();
	private int numberOfStudents=0;
	public Course(String cname){
		StudentName=cname;
	}
	public String getName(){
		return StudentName;
	}
	public int getScore(String key){
		return mScores.get(key).getmark();
	}
	public boolean courseIn(String key){
		return mScores.containsKey(key);
	}
	public void addDetails(String key,int value){
		Score bufScore=new Score(key,value);
		mScores.put(bufScore.getName(),bufScore);
		numberOfStudents++;
	}
	public void removeCourse(String key){
		mScores.remove(key);
		numberOfStudents--;
	}
	public void changeScore(String key,int value){
		removeCourse(key);
		addDetails(key,value);
	}
	public void insertScore(String key,int value){
		if(courseIn(key)){
			changeScore(key,value);
		}
		addDetails(key,value);
	}
	public int getNumberOfCourses(){
		return numberOfStudents;
	}
	public double listScores(){
		Set<Score> sortedScores=new TreeSet<Score>(mScores.values());
		double bufGPA=0.0;
		for(Score bufscore:sortedScores){
			bufGPA+=bufscore.getmark();
			System.out.println(bufscore.getName()+" gets "+bufscore.getmark());
		}
		return bufGPA/numberOfStudents;
	}
}