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絕對(duì)經(jīng)典代碼！

package com.imooc;

import java.util.Scanner;

public class Main {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

inputCommand();

}

public static void inputCommand(){

String[] Books = {"高數(shù)","英語(yǔ)","化學(xué)"};

System.out.println("輸入命令：1-按照名稱(chēng)查找圖書(shū);2-按照序號(hào)查找圖書(shū)");

Scanner sc = new Scanner(System.in);

try{

int flag = sc.nextInt();

if(flag == 1){

}

if(flag == 2){

inputNum();

}    

//如果輸入數(shù)字大于2,與異常處理相同

if(flag>2){

System.out.println("命令輸入錯(cuò)誤！請(qǐng)根據(jù)提示重新輸入命令！");

inputCommand();

}

}catch(Exception e){    //輸入字符，程序執(zhí)行catch語(yǔ)句塊代碼

System.out.println("命令輸入錯(cuò)誤！請(qǐng)根據(jù)提示重新輸入命令！");

inputCommand();     //循環(huán)

}

}

//按照名稱(chēng)查找圖書(shū)的方法

public static void inputName(){

String[] Books = {"高數(shù)","英語(yǔ)","化學(xué)"};

System.out.println("輸入圖書(shū)名稱(chēng):");

Scanner sc = new Scanner(System.in);

try{

String name = sc.next();

System.out.println("book:"+name);

inputCommand();     //繼續(xù)查找圖書(shū)

}catch(Exception e){

System.out.println("圖書(shū)不存在！");

inputCommand();

}

}

//按照序號(hào)查找圖書(shū)的方法

public static void inputNum(){    

String[] Books = {"高數(shù)","英語(yǔ)","化學(xué)"};

System.out.println("輸入圖書(shū)序號(hào):");

Scanner sc = new Scanner(System.in);

try{

int num = sc.nextInt();

System.out.println("book:"+Books[num]);

inputCommand();    //繼續(xù)查找圖書(shū)

}catch(Exception e){

System.out.println("圖書(shū)不存在！");

inputCommand();

}

}

}