求助一下equals问题

package yichang;
import java.util.Scanner;
import java.util.Arrays;
public class Library2 {
 public void show() throws CommondException,NotfoundException{
  Scanner input=new Scanner(System.in);
  Book book=new Book(new String[][]{
    {"1","唐诗三百首","T300"},
    {"2","十万个为什么","S1000"},
    {"3","三体","S3"},  
    {"4","java教程","J100"}});
  System.out.println("******************欢迎来到图书管理系统！*******************");
  System.out.println("*****输入命令：1-按照序号查找图书；2-按照名称查找图书*****");
  int i1=input.nextInt();
  if(i1==1) {
   System.out.println("请输入图书序号：");
   int i2=input.nextInt();   
   if(i2<1||i2>4) {
    throw new NotfoundException("图书不存在，请重新输入！");
   }else {
    System.out.println("序号："+book.book[i2-1][0]+"\t"+"名称："+book.book[i2-1][1]+"\t"+"编码："+book.book[i2-1][2]);
   }
  }else if(i1==2){
    System.out.println("请输入图书名称：");
    String name=input.next();
    int a=0;
    for(int i=0;i<3;i++) {
     if(name.equals(book.book[i][1]) ){
      System.out.println("序号："+book.book[i][0]+"\t"+"名称："+book.book[i][1]+"\t"+"编码："+book.book[i][2]); 
      a=1;
      break;
     }
    }
    if(a==0) {
     throw new NotfoundException("图书不存在，请重新输入！");
    }
  }
 }
  

 
 public static void main(String[] args) {
  // TODO 自动生成的方法存根
  Library2 kk=new Library2();
  try {
  kk.show();
  }catch(NotfoundException e) {
   e.printStackTrace();
  }catch(CommondException e) {
   e.printStackTrace();
  }
 }
 
}