交作业（1-9图书查询系统）

package book_retrieval_system;

import java.util.Scanner;

public class RetrievalSystem {

String[] books = {"Head First Java","Java数据结构","Java从入门到精通"};

public static void main(String[] args) {

// TODO Auto-generated method stub

RetrievalSystem find = new RetrievalSystem();

find.books();

}

public void books(){

try {

System.out.println("请选择查找方式：1、以书名查找。2、以图书序号查找。");

Scanner inputWays = new Scanner (System.in);

int way = inputWays.nextInt();

if(way==1||way==2) {

ways(way);

}else {

System.out.println("命令输入错误，请输入1或2");

books();

}

}catch(Exception ex) {

System.out.println("命令输入错误，请输入1或2");

books();

}

}

public void ways(int way) {

if(way==1) {

Scanner input1 = new Scanner(System.in);

System.out.println("请输入书名：");

String bookName = input1.next();

if (contains(books,bookName)==true) {

System.out.println("您要找的图书是：" + bookName);

books();

}else {

System.out.println("图书不存在");

books();

}

}else if(way==2) {

Scanner input2 = new Scanner(System.in);

System.out.println("请输入序号：");

int bookNumber = input2.nextInt();

if(bookNumber<=books.length&&bookNumber>0) {

System.out.println("您要找的图书是：" + books[bookNumber-1]);

books();

}else {

System.out.println("您输入有误或图书不存在");

books();

}

}

}

private boolean contains(String[] books,String bookName) {

// TODO Auto-generated method stub

for(String find:books) {

if(find.equals(bookName)) 

return true;

}

return false;

}

}