book類

package?Eception;

public?class?book?{
private?int?id;
private?String?name;
public??book(int?id,String?name)?{
????this.id=id;
????this.name=name;
}
public?int?getId()?{
????return?id;
}
public?void?setId(int?id)?{
????this.id?=?id;
}
public?String?getName()?{
????return?name;
}
public?void?setName(String?name)?{
????this.name?=?name;
}

}

借書類

package?Eception;

import?java.util.Scanner;

public?class?BorrowBooks?{
????book[]?books=?{new?book(1,"高數(shù)"),
???????????????????new?book(2,"英語"),
???????????????????new?book(3,"數(shù)據(jù)結(jié)構(gòu)")?};
????Scanner?scan=new?Scanner(System.in);
????
???public?static?void?main(String[]args)??{
??????BorrowBooks?b=new?BorrowBooks();
??????b.BorrowBook();
??????
???????//scan.close();
???}
???
????public?void?BorrowBook()?{
????????System.out.println("輸入命令：1.按名稱查找圖書?2.按序號查找圖書：3.退出");
????????String?a=scan.next();
????????try?{
????????????if(a.equals("1"))?{
????????????????mingcheng();
????????????}
????????????else?if(a.equals("2"))?{
????????????????xuhao();
????????????}
????????????else?if(a.equals("3"))?{
????????????????scan.close();
????????????????System.out.println("退出成功！");
????????????}
????????????else?{
????????????????throw?new?Errororders("命令錯誤，請重新輸入");
????????????}
????????}catch(Errororders?e){
????????System.out.println(e.getMessage());????
????????????//e.printStackTrace();
????????????BorrowBook();
????????}
????}
????
????public?void?mingcheng()?{
????????System.out.println("輸入圖書的名稱");
????????String?s=scan.next();
????????int?a=-1;
????????for(int?i=0;i<books.length;i++)?{
????????????if(s.equals(books[i].getName()))?{
????????????????a=1;
????????????????System.out.println("book序號："+books[i].getId());
????????????????BorrowBook();
????????????}
????????}
????????if(a==-1)?{
????????????try?{
????????????????throw?new?Errororders("該圖書不存在！");
????????????}?catch?(Errororders?e)?{
????????????????//?TODO?Auto-generated?catch?block
????????????????//e.printStackTrace();
????????????????System.out.println(e.getMessage());
????????????????BorrowBook();
????????????}
????????}
????}
????
????public?void?xuhao()?{
????System.out.println("輸入圖書的序號");
????int?s=scan.nextInt();
????int?a=-1;
????for(int?i=0;i<books.length;i++)?{
????????//System.out.println("圖書名稱?。?+books[i].getId());
????????if(s==books[i].getId())?{
????????????a=1;
????????????System.out.println("圖書名稱："+books[i].getName());
????????????BorrowBook();
????????}????
????}
????if(a==-1)?{
????????try?{
????????????throw?new?Errororders("該序號不存在！");
????????}?catch?(Errororders?e)?{
????????????//?TODO?Auto-generated?catch?block
????????????//e.printStackTrace();
????????????System.out.println(e.getMessage());
????????????BorrowBook();
????????}
????}
????}
}

自定義的異常Errororders

package?Eception;

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