package first;

import java.util.Scanner;

public class Hello {

public static void main(String[] args){

String[] books = new String[5];

books[0] = "高数";

books[1] = "线代";

books[2] = "英语";

books[3] = "化学";

books[4] = "历史";

Hello h = new Hello();

int num = h.welcome();

while(true) {

if (num == 1) {

try {

if (h.byName(books)){

break;

}

} catch (NotFoundException e) {

// TODO Auto-generated catch block

System.out.println("图书不存在！");

num = h.welcome();

}

} else if (num == 2) {

try {

if (h.byNum(books)) {

break;

}

} catch (NotFoundException e) {

// TODO Auto-generated catch block

System.out.println("图书不存在！");

num = h.welcome();

}

} else {

System.out.println("NUM:"+num);

break;

}

}

}

public int welcome(){

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 sin = new Scanner(System.in);

int num = 0;

try {

num = sin.nextInt();

} catch (Exception e) {

// TODO: handle exception

System.out.println("命令错误！请根据提示输入数字命令！");

num = welcome();

}

return num;

}

public boolean byName(String[] books) throws NotFoundException{

Scanner sin = new Scanner(System.in);

System.out.println("输入图书名称:");

String name = sin.next();

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

if (books[i].equals(name) == true) {

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

return true;

}

}

throw new NotFoundException("图书不存在！");

}

public boolean byNum(String[] books) throws NotFoundException{

Scanner sin = new Scanner(System.in);

System.out.println("输入图书序号:");

int num;

try {

num = sin.nextInt();

} catch (Exception e) {

// TODO: handle exception

throw new NotFoundException("图书不存在！");

}

if (num < 0 || num > books.length) {

throw new NotFoundException("图书不存在！");

}

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

return true;

}

}