为什么在输入图书名称之后不会运行下面的输出Book的语句呢

package com.BorrowBooks;

import java.util.Scanner;

public class book {
  public static void main(String[] args) {
   for(;;){
   System.out.println("欢迎使用借书系统");
   System.out.println("输入命令：1.按名称查找图书   2.按序号查找图书");
   Scanner in=new Scanner(System.in);
   int choice = 3;
   int i = 0;
   int j = 0;
   String[] Book = {"高数","线代","概率论与数理统计","大学英语","数据库","操作系统","java面向对象"};
   try{
    choice = in.nextInt();
   }catch(Exception e){
    System.out.println("命令输入错误，请根据提示输入整形的数字");
    continue;
   }
   if(choice == 1){
    System.out.println("请输入你要借的书的名称");
    try{
     for(i=0;i<Book.length;i++){
      if(Book[i]==in.nextLine()){
       System.out.println("Book:"+Book[i]);
       continue;
     }
    }catch(Exception e){
     System.out.println("图书不存在");
     continue;
    }
   }else if(choice == 2){
    System.out.println("请输入你要借的书的序号");
    try{
     for(j=0;j<Book.length;j++){
      if(j==in.nextInt()){
       System.out.println("Book:"+Book[i]);
       continue;
                }
    }catch(Exception e){
     System.out.println("图书不存在");
     continue;
    }
   }else {
    System.out.println("你的选择错误");
   }
  }
  }
}

Destiny命运

2016-08-01

源自：Java入门第三季 1-9

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4 回答

慕瓜7080925
2016-08-05

Exception无法转换为Throwable

0 回复有任何疑惑可以回复我~

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慕瓜7080925
2016-08-05

你这写的问题太多了

0 回复有任何疑惑可以回复我~

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Destiny命运提问者
2016-08-02

是我傻了哦，这样写就好了

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("欢迎使用借书系统");
   System.out.println("输入命令：1.按名称查找图书   2.按序号查找图书");
   Scanner in=new Scanner(System.in);
   int choice = 3;
//   int i= 0;
//   int j = 0;
//   String[] Book = {"高数","线代","概率论与数理统计","大学英语","数据库","操作系统","java面向对象"};
   try{
    choice = in.nextInt();
   }catch(Exception e){
    System.out.println("命令输入错误，请根据提示输入整形的数字");
    continue;
   }
   if(choice == 1){
//    System.out.println("请输入你要借的书的名称");
//    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("图书不存在");
//     continue;
//    }
//    }
//   System.out.println("Book:"+Book[i]);
    book Mc = new book();
    Mc.find1();
   }else if(choice == 2){
//    System.out.println("请输入你要借的书的序号");
//    for(j=0;j<Book.length;j++){
//    try{
//       j=in.nextInt();
//     System.out.println("Book:"+Book[j]);
//     break;
//    }catch(Exception e){
//     System.out.println("图书不存在");
//     continue;
//    }
//    }
//    System.out.println("Book:"+Book[j]);
    book Xh = new book();
    Xh.find2();
   }else {
    System.out.println("你的选择错误");
   }
  }
  }
  @SuppressWarnings("resource")
  public void find1(){
   int i = 0;
   String[] Book = {"高数","线代","概率论与数理统计","大学英语","数据库","操作系统","java面向对象"};
   System.out.println("请输入你要借的书的名称");
   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("图书不存在");
    continue;
   }
   }
  }
  @SuppressWarnings("resource")
  public void find2(){
   int j = 0;
   String[] Book = {"高数","线代","概率论与数理统计","大学英语","数据库","操作系统","java面向对象"};
   System.out.println("请输入你要借的书的序号");
   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("图书不存在");
    continue;
   }
   }
  }
}