个回答

• 薄荷波

  2018-06-30 17:12:06

  代码结构很清晰，赞

  0

• syjjqq

  2018-05-03 10:36:59

  package weak2;

  import java.util.Scanner;

  
  

  public class Demo {

  
  

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

  //数组定义

  static String[] books = {"西语言","西家家","数据裤"};

  public static void main(String[] args){

  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");

  Scanner in =new Scanner(System.in);

  String book;

  try {

  int num = in.nextInt();

  if(num == 1) {

  //判断用户想要使用名称查找图书

  book = getBookByName(books);

  //获取用户的图书

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

  }else if(num == 2) {

  //判断用户想要用序号来查找图书

  book = getBookByNumber(books);

  //获取图书

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

  }

  //只要输入的不是1或2,程序结束

  else {

  System.out.println("输入不对，请重新运行！谢谢！");

  }

  //如果不是整型那么程序也结束，重新运行

  }catch(Exception e) {

  System.out.println("命令输入错误！请根据提示输入数字命令！请重新运行！谢谢！");

  }

  }

  //匹配名称输入，返回图书名称

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

  System.out.println("输入图书名称：");

  String bookname = go.next();

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

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

  return books[i];

  }

  }

  throw new Exception("图书不存在！请重新运行！谢谢！");

  }

  //匹配序号输入返回图书名称

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

  System.out.println("输入图书序号：");

  try {

  //直接输出，如果下标越界则会报错

  int booknumber = go.nextInt();

  String book1 = books[booknumber-1];

  return book1;

  }catch(Exception e){

  Exception ok = new Exception("图书不存在2！请重新运行！谢谢！");

  throw ok;

  }

  }

  
  

  }

  
  

  0