java菜鸟工程师
2019-05-07 19:14
package com.imooc.exception; import java.util.Arrays; import java.util.Scanner; public class BorrowBook { public static void main(String[] args) { BorrowBook borrowBook=new BorrowBook(); borrowBook.Borrow(); } public void Borrow(){ // 书号分别对应的是1,2,3,4 String[] books={"西游记","红楼梦","三国演义","水浒传"}; System.out.println("欢迎使用图书管理系统!"); System.out.println("1. 按照书名查找图书 2.按照序号查找图书"); Scanner input =new Scanner(System.in); try { int num=input.nextInt(); if (num==1){ System.out.println("请输入书名:"); Scanner input1=new Scanner(System.in); String bookname=input1.nextLine(); boolean book= Arrays.asList(books).contains(bookname); if (book==true){ System.out.println(bookname+"借书成功!"); }else { throw new NoBookException("此书不存在"); } } if (num==2){ System.out.println("请输入书号:"); Scanner input2=new Scanner(System.in); int shuhao=input2.nextInt(); if (shuhao>0 && shuhao<=books.length ){ System.out.println(books[shuhao-1]+"借书成功!"); }else{ throw new NoBookException("查无此书!"); } } }catch (NoBookException e){ System.out.println(e); System.out.println(); Borrow(); } } }
你的shuhao应该>=0,就比如36行,应该这么写:if
(shuhao>=
0
&& shuhao<books.length )。因为数组下标从0开始
这个序号是自动就给定好了的吗?
package
com.imooc.exception;
import
java.util.Arrays;
import
java.util.Scanner;
public
class
BorrowBook {
public
static
void
main(String[] args) {
BorrowBook borrowBook=
new
BorrowBook();
borrowBook.Borrow();
}
public
void
Borrow(){
// 书号分别对应的是1,2,3,4
String[] books={
"西游记"
,
"红楼梦"
,
"三国演义"
,
"水浒传"
};
System.out.println(
"欢迎使用图书管理系统!"
);
System.out.println(
"1. 按照书名查找图书 2.按照序号查找图书"
);
Scanner input =
new
Scanner(System.in);
try
{
int
num=input.nextInt();
if
(num==
1
){
System.out.println(
"请输入书名:"
);
Scanner input1=
new
Scanner(System.in);
String bookname=input1.nextLine();
boolean
book= Arrays.asList(books).contains(bookname);
if
(book==
true
){
System.out.println(bookname+
"借书成功!"
);
}
else
{
throw
new
NoBookException(
"此书不存在"
);
}
}
if
(num==
2
){
System.out.println(
"请输入书号:"
);
Scanner input2=
new
Scanner(System.in);
int
shuhao=input2.nextInt();
if
(shuhao>
0
&& shuhao<=books.length ){
System.out.println(books[shuhao-
1
]+
"借书成功!"
);
}
else
{
throw
new
NoBookException(
"查无此书!"
);
}
}
}
catch
(NoBookException e){
System.out.println(e);
System.out.println();
Borrow();
}
}
}
你这个已经挺简单了,要是借书前加个循环输出都有哪些书号+书名,就更好了
Java入门第三季
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