代碼結(jié)構(gòu)很清晰，贊

package weak2;

import java.util.Scanner;

public class Demo {

private static Scanner go = new Scanner(System.in);

//數(shù)組定義

static String[] books = {"西語言","西家家","數(shù)據(jù)褲"};

public static void main(String[] args){

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

Scanner in =new Scanner(System.in);

String book;

try {

int num = in.nextInt();

if(num == 1) {

//判斷用戶想要使用名稱查找圖書

book = getBookByName(books);

//獲取用戶的圖書

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

}else if(num == 2) {

//判斷用戶想要用序號(hào)來查找圖書

book = getBookByNumber(books);

//獲取圖書

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

}

//只要輸入的不是1或2,程序結(jié)束

else {

System.out.println("輸入不對(duì)，請(qǐng)重新運(yùn)行！謝謝！");

}

//如果不是整型那么程序也結(jié)束，重新運(yùn)行

}catch(Exception e) {

System.out.println("命令輸入錯(cuò)誤！請(qǐng)根據(jù)提示輸入數(shù)字命令！請(qǐng)重新運(yùn)行！謝謝！");

}

}

//匹配名稱輸入，返回圖書名稱

public static String getBookByName(String[] book) throws Exception{

System.out.println("輸入圖書名稱：");

String bookname = go.next();

for(int i = 0;i <= books.length;i++) {

if(bookname.equals(books[i])){

return books[i];

}

}

throw new Exception("圖書不存在！請(qǐng)重新運(yùn)行！謝謝！");

}

//匹配序號(hào)輸入返回圖書名稱

public static String getBookByNumber(String[] book) throws Exception{

System.out.println("輸入圖書序號(hào)：");

try {

//直接輸出，如果下標(biāo)越界則會(huì)報(bào)錯(cuò)

int booknumber = go.nextInt();

String book1 = books[booknumber-1];

return book1;

}catch(Exception e){

Exception ok = new Exception("圖書不存在2！請(qǐng)重新運(yùn)行！謝謝！");

throw ok;

}

}

}