Exception無法轉換為Throwable

你這寫的 問題太多了

是我傻了哦，這樣寫就好了

package com.BorrowBooks;

//import java.awt.print.Book;
import java.util.Scanner;

public class book {
??@SuppressWarnings("resource")
??public static void main(String[] args){
???for(;;){
???System.out.println("歡迎使用借書系統");
???System.out.println("輸入命令：1.按名稱查找圖書?? 2.按序號查找圖書");
???Scanner in=new Scanner(System.in);
???int choice = 3;
//???int i= 0;
//???int j = 0;
//???String[] Book = {"高數","線代","概率論與數理統計","大學英語","數據庫","操作系統","java面向對象"};
???try{
????choice = in.nextInt();
???}catch(Exception e){
????System.out.println("命令輸入錯誤，請根據提示輸入整形的數字");
????continue;
???}
???if(choice == 1){
//????System.out.println("請輸入你要借的書的名稱");
//????for(i=0;i<Book.length;i++){
//????try{
//?????? ?in.nextLine().equals(Book[i]);
//???????System.out.println("Book:"+Book[i]);
//???????break;
//????}catch(Exception e){
//?????System.out.println("圖書不存在");
//?????continue;
//????}
//????}
//???System.out.println("Book:"+Book[i]);
????book Mc = new book();
????Mc.find1();
???}else if(choice == 2){
//????System.out.println("請輸入你要借的書的序號");
//????for(j=0;j<Book.length;j++){
//????try{
//?????? j=in.nextInt();
//?????System.out.println("Book:"+Book[j]);
//?????break;
//????}catch(Exception e){
//?????System.out.println("圖書不存在");
//?????continue;
//????}
//????}
//????System.out.println("Book:"+Book[j]);
????book Xh = new book();
????Xh.find2();
???}else {
????System.out.println("你的選擇錯誤");
???}
??}
??}
??@SuppressWarnings("resource")
??public void find1(){
???int i = 0;
???String[] Book = {"高數","線代","概率論與數理統計","大學英語","數據庫","操作系統","java面向對象"};
???System.out.println("請輸入你要借的書的名稱");
???Scanner in=new Scanner(System.in);
???String H = in.next();
???for(i=0;i<Book.length;i++){
???try{
????? ?H.equals(Book[i]);
??????System.out.println("Book:"+H);
??????break;
???}catch(Exception e){
????System.out.println("圖書不存在");
????continue;
???}
???}
??}
??@SuppressWarnings("resource")
??public void find2(){
???int j = 0;
???String[] Book = {"高數","線代","概率論與數理統計","大學英語","數據庫","操作系統","java面向對象"};
???System.out.println("請輸入你要借的書的序號");
???Scanner in=new Scanner(System.in);
???for(j=0;j<Book.length;j++){
???try{
????? j=in.nextInt();
????System.out.println("Book:"+Book[j]);
????break;
???}catch(Exception e){
????System.out.println("圖書不存在");
????continue;
???}
???}
??}
?}

根據你的代碼你必須輸入Book.length次才執行輸出語句，而且你的判斷語句后面沒有執行語句？if完然后干嘛？