作業提交，大家給提提意見，有什么簡單點的方法實現嗎

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(){
????????//?書號分別對應的是1，2，3，4
????????String[]?books={"西游記","紅樓夢","三國演義","水滸傳"};
????????System.out.println("歡迎使用圖書管理系統！");
????????System.out.println("1.?按照書名查找圖書???????2.按照序號查找圖書");
????????Scanner?input?=new?Scanner(System.in);
????????try?{
???????????int?num=input.nextInt();
???????????if?(num==1){
???????????????System.out.println("請輸入書名：");
???????????????Scanner?input1=new?Scanner(System.in);
???????????????String?bookname=input1.nextLine();
???????????????boolean?book=?Arrays.asList(books).contains(bookname);
???????????????if?(book==true){
???????????????????System.out.println(bookname+"借書成功！");
???????????????}else?{
???????????????????throw?new?NoBookException("此書不存在");
???????????????}
???????????}
???????????if?(num==2){
???????????????System.out.println("請輸入書號：");
???????????????Scanner?input2=new?Scanner(System.in);
???????????????int?shuhao=input2.nextInt();

???????????????????if?(shuhao>0?&&?shuhao<=books.length?){
???????????????????????System.out.println(books[shuhao-1]+"借書成功！");
???????????????????}else{
???????????????????????throw?new?NoBookException("查無此書！");
???????????????????}
???????????}
????????}catch?(NoBookException?e){
????????????System.out.println(e);
????????????System.out.println();
????????????Borrow();
????????}
????}
}

java菜鳥工程師

2019-05-07

源自：Java入門第三季 1-9

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4 回答

大神godbig
2019-07-28

你的shuhao應該>=0，就比如36行，應該這么寫：if?(shuhao>=0??&& shuhao<books.length?)。因為數組下標從0開始

0 回復有任何疑惑可以回復我~

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qq_慕沐4213791
2019-07-23

這個序號是自動就給定好了的嗎？

0 回復有任何疑惑可以回復我~

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拆雞

他拿的是索引嗎？？？？

2019-07-31 回復有任何疑惑可以回復我~

楊小羊沖丫
2019-07-21

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(){????????//?書號分別對應的是1，2，3，4????????String[]?books={"西游記","紅樓夢","三國演義","水滸傳"};????????System.out.println("歡迎使用圖書管理系統！");????????System.out.println("1.?按照書名查找圖書???????2.按照序號查找圖書");????????Scanner?input?=new?Scanner(System.in);????????try?{???????????int?num=input.nextInt();???????????if?(num==1){???????????????System.out.println("請輸入書名：");???????????????Scanner?input1=new?Scanner(System.in);???????????????String?bookname=input1.nextLine();???????????????boolean?book=?Arrays.asList(books).contains(bookname);???????????????if?(book==true){???????????????????System.out.println(bookname+"借書成功！");???????????????}else?{???????????????????throw?new?NoBookException("此書不存在");???????????????}???????????}???????????if?(num==2){???????????????System.out.println("請輸入書號：");???????????????Scanner?input2=new?Scanner(System.in);???????????????int?shuhao=input2.nextInt();????????????????????if?(shuhao>0?&&?shuhao<=books.length?){???????????????????????System.out.println(books[shuhao-1]+"借書成功！");???????????????????}else{???????????????????????throw?new?NoBookException("查無此書！");???????????????????}???????????}????????}catch?(NoBookException?e){????????????System.out.println(e);????????????System.out.println();????????????Borrow();????????}????}}