借书系统 使用ArrayList<String>记录图书条目 欢迎批评指正

package com.imooc;

import java.util.*;

public class HelloWorld {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        HelloWorld hello = new HelloWorld();
        hello.UserInterface();
    }

    public void UserInterface(){
        Scanner input = new Scanner(System.in);
        ArrayList<String> words = new ArrayList<String>();
        words.add("论语");
        words.add("高数");
        words.add("线性代数");
        words.add("数据结构");

        try{
            System.out.println("输入命令： 1——按照名称查找图书； 2——按照序号查找图书");

            switch(input.nextInt()){
                case 1:
                    this.searchBookByName(words);
                    break;
                case 2:
                    this.searchBookByNumber(words);
                    break;
                default:
                    break;
            }
        }catch(InputMismatchException e){
            System.out.println("命令输入错误！请按照提示输入数字命令！");
        }
        finally{
            input.close();
        }
    }

    public void searchBookByName(ArrayList<String> words){
        Scanner input = new Scanner(System.in);
        try{
            System.out.println("输入图书名称:");
            String inputName = input.next();
            if(words.contains(inputName)){
                System.out.println("book:" + inputName);
            }else{
                System.out.println("图书不存在");
            }
        }catch(InputMismatchException e){
            System.out.println("命令输入错误！请输入图书名称！");
        }
        finally{
            input.close();
        }   
    }
    public void searchBookByNumber(ArrayList<String> words){
        Scanner input = new Scanner(System.in);

        try{
            System.out.println("输入图书序号:");
            System.out.println("book:" + words.get(input.nextInt()));

        }catch(InputMismatchException e){
            System.out.println("命令输入错误！请根据提示输入数字命令");
        }catch(IndexOutOfBoundsException e){
            System.out.println("图书不存在");
        }
        finally{
            input.close();
        }
    }

}