百思不得其解,当图书名称输入错误时不能重新执行bookName()方法
package librarySystem;
import java.util.*;
public class LibrarySystem {
//自定义NoBookException异常类
public static class NoBookException extends Exception{
public NoBookException(){}
public NoBookException(String message){
super(message);
}
}
public static String[] books={"高数","线代","几何","生物","编程"};
public static void main(String[] args) {
System.out.println("序号.\t书名");
for (int i=1;i<=5;i++){
System.out.println(i+".\t\t"+books[i-1]);
}
LibrarySystem lib=new LibrarySystem();
lib.test();
}
public void test(){
try {
System.out.println("请选择:1-按照序号查找图书;2-按照名称查找图书");
int i = input();
switch (i) {
case 1:
bookNum();
break;
case 2:
bookName();
break;
case -1:
test();
break;
default:
throw new NoBookException("请输入1或2:");
}
}
catch(NoBookException e){
System.out.println(e.getMessage());
test();
}
}
public void bookNum(){
System.out.println("请输入图书序号:");
try {
int i = input();
if (i > 0 & i <= books.length)
System.out.println(books[i-1]);
else
throw new NoBookException("请输入正确的序号");
}catch(NoBookException e){
System.out.println(e.getMessage());
bookNum();
}
}
public void bookName(){
Scanner sc = new Scanner(System.in);
try {
System.out.println("请输入书名:");
String book= sc.next();
boolean flag=false;
for (String i:books) {
if (book.equals(i)) {
flag=true;
System.out.println(i);
break;
}
}
if(flag=false) {
throw new NoBookException("请输入正确的书名:");
}
}catch (NoBookException e){
System.out.println(e.getMessage());
bookName();
}catch (Exception e){
e.printStackTrace();
bookName();
}
}
public int input(){
Scanner sc = new Scanner(System.in);
try {
int i = sc.nextInt();
return i;
}catch (Exception e){
System.out.println("请输入整数");
sc=new Scanner(System.in);
return -1;
}
}
}第61行,当图书名称输入错误时不能重新执行bookName()方法,不知道哪出问题了
