workspace.java

java编制的成绩管理系统

import java.io.*;
import java.util.*;

public class WorkSpace {
	private HashMap<Student, Course> mClass=new HashMap<Student, Course>();
	private int numberOfStudents;
	private int numberOfCourses;
    public void printWelcome(){
		System.out.println("Welcome to the Grading System.");
	}
	public void printMenu(){
		System.out.println(
				"1.Add Score by Hand;\n" +
				"2.Add Scores by file;\n" +
				"3.Query Scores of a Student;\n" +
				"4.Query Scores of a Course;\n" +
				"5.Quit.\n" +
				"Please Enter your choose(1,2,3 or 4):"
				);
	}
	public void printGoodbye(){
		System.out.println("Bye..");
	}
	public void enterDescription(){
		System.out.println(
				"Please enter your information in this form"
				+"\"name, course name, score\"(without the quotation mark):");
	}
	public void fileDescription(){
		System.out.println(
				"Please guarantee the information in this form"
				+"\"name, course name, score\"(without the quotation mark)!");
		System.out.println("Please enter the path of your file:");
	}
	public boolean studentIn(String key){
		return mClass.containsKey(key);
	}
	public boolean CourseIn(String value){
		return mClass.containsValue(value);
	}
	public void addStuInfo(String sname,String cname,int value){
		if(!studentIn(sname)){
			Student bufStudent=new Student(sname);
			mStudents.put(sname,bufStudent);
		}
		mStudents.get(sname).insertScore(cname,value);
	}
	public void addCourInfo(String sname,String cname,int value){
		if(!CourseIn(sname)){
			Course bufCourse=new Course(cname);
			mCourses.put(cname,bufCourse);
		}
		mCourses.get(cname).insertScore(sname,value);
	}
	public int getNumberOfStudents(){
		return numberOfStudents;
	}
	public int getNumberOfCourses(){
		return numberOfCourses;
	}
	public void singleInput(){
		enterDescription();
		Scanner reader=new Scanner(System.in);
		boolean tryAgain=true;
		while(tryAgain){
			String line=reader.nextLine();
			String wordArray[]=line.split(",");
			try{
				int value=Integer.parseInt(wordArray[2]);
				addStuInfo(wordArray[0],wordArray[1],value);
				addCourInfo(wordArray[0],wordArray[1],value);
				tryAgain=false;
			}catch(RuntimeException e){
				System.out.println("You should enter the information correctly!");
			}
		}
	}
	public void fileInput(){
		fileDescription();
		Scanner stdin=new Scanner(System.in);
		String file=stdin.nextLine();
		Scanner reader=new Scanner(file);
		while(reader.hasNextLine()){
			String line=reader.nextLine();
			String wordArray[]=line.split(",");
			boolean err=false;
			while(!err){
				try{
					int value=Integer.parseInt(wordArray[2]);
					addStuInfo(wordArray[0],wordArray[1],value);
					addCourInfo(wordArray[0],wordArray[1],value);
				}catch(RuntimeException e){
					err=true;
				}
			}
			if(err){
				System.out.println("These're some errors in your file.");
				break;
			}
		}
	}
	public void retrieveStudent(){
		System.out.println("Please enter the student's name:");
		Scanner reader=new Scanner(System.in);
		double bufGPA = 0.0;
		String 	bufName=reader.nextLine();
		if(studentIn(bufName)){
			bufGPA=mStudents.get(bufName).listScores();
			System.out.println("GPA of "+bufName+"="+bufGPA);
		}else{
			System.out.println(bufName+" doesn't exist!");
		}
	}
	public void retrieveCourse(){
		System.out.println("Please enter the the name of course:");
		Scanner reader=new Scanner(System.in);
		String bufName=reader.nextLine();
		double bufGPA = 0.0;
		if(CourseIn(bufName)){
			bufGPA=mCourses.get(bufName).listScores();
			System.out.println("GPA of "+bufName+"="+bufGPA);
		}else{
			System.out.println(bufName+" doesn't exist!");
		}
	}
	public void initialize() throws IOException{
		BufferedReader reader=new BufferedReader(new FileReader("DataBase.CSV"));
		int n=reader.read();
		for(int i=0;i<n;i++){
			String bufname=reader.readLine();
			int m=reader.read();
			for(int j=0;j<m;j++){
				String bufcourse=reader.readLine();
				int bufmark=reader.read();
				addStuInfo(bufname,bufcourse,bufmark);
				addCourInfo(bufname,bufcourse,bufmark);
			}
		}
	}
	public void start() throws IOException{
		boolean finished=false;
		initialize();
		printWelcome();
		while(!finished){
			printMenu();
			Scanner input=new Scanner(System.in);
		    int choose=input.nextInt();
			switch(choose){
			case 1:
				singleInput();
				break;
			case 2:
				fileInput();
				break;
			case 3:
				retrieveStudent();
				break;
			case 4:
				retrieveCourse();
				break;
			default:
				finished=true;
				break;
			}
		}
		printGoodbye();
	}
	public void listStudents(){
	}
	public void backUp() throws IOException{
		FileWriter writer=new FileWriter("DataBase.CSV");
		PrintWriter out = new PrintWriter(writer);
		out.println(numberOfStudents);
		Iterator it = mStudents.entrySet().iterator();   
		    while(it.hasNext()){   
		        Map.Entry m=(Map.Entry)it.next();
		        out.println(((Student)m.getValue()).getName());
				out.println(((Student)m.getValue()).getNumberOfCourses());
				Iterator that =((Student) m.getValue()).mScores.entrySet().iterator();
		        while(that.hasNext()){
		        	Map.Entry n=(Map.Entry)that.next();
		        	out.println(((Student) n.getValue()).getName());
		        	out.println(((Object) n.getValue()).getMark());
		        }
		    }
	}
		
		
//		Set<Student> sortedStudents=new TreeSet<Student>(mStudents.values());
		//	for(Student bufstudent:sortedStudents){
//
		//	bufstudent.listScores();
		//}
		out.close();
		writer.close();
	}
	public static void main(String[] args) throws IOException{
		WorkSpace system=new WorkSpace();
		system.start();
		system.backUp();
	}
}