Java圖書查詢系統執行個體（簡化精鍊版及部分更正）

標籤：return   sharp   ati   建立   選擇   lis   throw   continue   except   

1.建立書大類

public class Book {private String name;private int num; public Book(String name,int num){this.name=name;this.num=num;}public String getName(){return name;}public void setName(String name){this.name=name;}public int getNum(){return num;}public void setNum(int num){this.num=num;}}

 2.自訂異常

public  class NoExistException extends Exception{public NoExistException(String message){super(message);}public NoExistException(){}}

 3.主程式

import java.util.*;public class Test2 { private Scanner input = new Scanner(System.in); Book[] book={ new Book("語文",1), new Book("數學",2), new Book("英語",3), new Book("專業課",4) };// public List<Book> listbooks;// public Test2() {//         this.listbooks = new ArrayList<Book>();//         }//     public void listBooksAdd() {//         listbooks.addAll(Arrays.asList(book));//         }  public void printbook(){ System.out.println("====歡迎使用選書系統===="); System.out.println("=====書本資訊如下：====="); System.out.println("序號"+"\t"+"書名"); for(Book bk:book){ System.out.println(bk.getNum()+"\t"+bk.getName()); } } public static void main(String[] args) {Test2 tc=new Test2();//tc.listBooksAdd();tc.printbook();while(true){    System.out.println("請選擇查書方式1-通過序號2-通過書名：");switch(tc.back()){case 1:try{ System.out.println("您的書為："+tc.fbid()); break;}catch(Exception e){System.out.println(e.getMessage());continue;}case 2:try{System.out.println("您的書為："+tc.fbbn());break;}catch(Exception e){System.out.println(e.getMessage());continue;}default:System.out.println("輸入錯誤！請重新輸入！！！");continue;}break;}}public String fbid() throws NoExistException{System.out.println("請輸入圖書的序號：");int in=input.nextInt();for(Book bk:book){if(in==bk.getNum()){return book[in-1].getName();}}throw new NoExistException("序號越界請重新輸入");}public String fbbn()throws NoExistException{System.out.println("請輸入圖書的書名：");String in=input.next();for(Book bk:book){if(in.equals(bk.getName())){return bk.getName();}}throw new NoExistException("此書不存在");}public int back(){int in=input.nextInt();return in;}}

 

Java圖書查詢系統執行個體（簡化精鍊版及部分更正）