java學生成績管理系統

我做了個控制臺的：

異常沒處理!

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import?java.util.Scanner;

public?class?Main?{

Scanner?input?=?new?Scanner(System.in);

public?static?void?main(String[]?args)?{

Main?m=?new?Main();

m.showView();

}

public?void?showView(){

System.out.println("歡迎使用學生管理系統");

System.out.println("******************");

System.out.println("1.輸入學生信息");

System.out.println("2.展示學生信息");

System.out.println("3.退出系統");

System.out.println("請選擇：");

choseFunction();

}

public?void?choseFunction(){

int?i=?input.nextInt();

switch(i){

case?1:

InputInfo?ii?=?new?InputInfo();

ii.check();

this.showView();

break;

case?2:

ShowInfo?si?=?new?ShowInfo();

si.show();

this.showView();

break;

case?3:

System.out.println("Bye-Bey!");

System.exit(0);

break;

default:

System.out.println("輸入有誤，請重新輸入：");

this.choseFunction();

break;

}

}

}

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import?java.util.Scanner;

import?java.util.List;

import?java.io.*;

public?class?InputInfo?{

StuDataSource?sds?=?new?StuDataSource();

Scanner?input?=?new?Scanner(System.in);

List<StuInfo>?list?=?sds.getList();

private?StuInfo?input(){

StuInfo?stu?=?new?StuInfo();

System.out.println("請輸入學生姓名：");

stu.setName(input.next());

System.out.println("請輸入學生學號：");

stu.setNo(input.next());

System.out.println("請輸入學生成績（數字）：");

stu.setScore(input.nextDouble());

if(list.size()>0){

list?=?this.sort(stu);

}else{

list.add(stu);

}

return?stu;

}

private?void?save(StuDataSource?s){

try?{

ObjectOutputStream?out?=?new?ObjectOutputStream(new?FileOutputStream("StuInfos.out"));

out.writeObject(s);

out.flush();

out.close();

}?catch?(FileNotFoundException?e)?{

//?TODO?Auto-generated?catch?block

e.printStackTrace();

}?catch?(IOException?e)?{

//?TODO?Auto-generated?catch?block

e.printStackTrace();

}

}

public?void?check(){

String?istr="";

do{

this.input();

System.out.println("還要繼續錄入嗎？（Y/N）");

istr?=?input.next();

istr.toLowerCase();

}while(istr.equals("y"));

this.save(sds);

}

public?List<StuInfo>?sort(StuInfo?stu){

for?(int?i?=?list.size();?i?>0?;?i--)?{

StuInfo?tempStu?=?(StuInfo)?list.get(i-1);

if(tempStu.getScore()<stu.getScore()){

list.add(i,stu);

return?list;

}else?if(i-1==0&&tempStu.getScore()>stu.getScore()){

list.add(0,stu);

}

}

return?list;

}

}

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import?java.io.FileInputStream;

import?java.io.FileNotFoundException;

import?java.io.IOException;

import?java.io.ObjectInputStream;

import?java.util.List;

import?java.util.Scanner;

public?class?ShowInfo?{

Scanner?input?=?new?Scanner(System.in);

public?String?show(){

String?istr?="";

System.out.println("姓名"+"\t"+"學號"+"\t"+"成績");

try?{

ObjectInputStream?in?=?new?ObjectInputStream(new?FileInputStream("StuInfos.out"));

StuDataSource?stus?=?(StuDataSource)in.readObject();

List<StuInfo>?list?=?stus.getList();

for?(int?i?=?0;?i?<?list.size();?i++)?{

StuInfo?stu?=?list.get(i);

System.out.println(stu.getName()+"\t"+stu.getNo()+"\t"+stu.getScore());

}

System.out.println("按任意鍵返回！");

istr=input.next().toLowerCase();

}?catch?(FileNotFoundException?e)?{

//?TODO?Auto-generated?catch?block

e.printStackTrace();

}?catch?(IOException?e)?{

//?TODO?Auto-generated?catch?block

e.printStackTrace();

}?catch?(ClassNotFoundException?e)?{

//?TODO?Auto-generated?catch?block

e.printStackTrace();

}

return?istr;

}

}

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import?java.io.*;

public?class?StuInfo?implements?Serializable{

private?String?name;

private?String?no;

private?double?score;

public?String?getName()?{

return?name;

}

public?void?setName(String?name)?{

this.name?=?name;

}

public?String?getNo()?{

return?no;

}

public?void?setNo(String?no)?{

this.no?=?no;

}

public?double?getScore()?{

return?score;

}

public?void?setScore(double?score)?{

this.score?=?score;

}

}

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import?java.io.Serializable;

import?java.util.ArrayList;

import?java.util.List;

public?class?StuDataSource?implements?Serializable?{

private?List<StuInfo>?list?=?new?ArrayList<StuInfo>();

public?List<StuInfo>?getList()?{

return?list;

}

public?void?setList(List<StuInfo>?list)?{

this.list?=?list;

}

}

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思路就是這樣！加分給我謝謝~！