作业提交 。
InputException.java
package com.imooc.test;
public class InputException extends Exception {
public InputException() {
super();
System.out.println("命令输入错误！请根据提示输入数字命令！");
}
public InputException(String message) {
super(message);
System.out.println(message);
}
}
BookBorrow.java
package com.imooc.test;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.Scanner;
public class BookBorrow {
private static String[] books = { "高数", "积分变换", "线性代数", "马克思哲学" };
public static void main(String[] args) {
// TODO Auto-generated method stub
BookBorrow bkb = new BookBorrow();
bkb.borrow();
}
public void borrowByName(Scanner input) throws InputException {
System.out.println("输入图书名称：");
String name = input.next();
if (-1 == Arrays.binarySearch(books, name)) {
System.out.println("图书不存在！");
throw new InputException();
} else {
System.out.println("book: " + name);
}
}
public void borrowByNumber(Scanner input) throws InputException {
System.out.println("输入图书序号：");
int num = input.nextInt();
if (num < 1 || num > books.length) {
System.out.println("图书不存在！");
throw new InputException();
} else {
System.out.println("book: " + books[num - 1]);
}
}
public void borrow() {
Scanner input = new Scanner(System.in);
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");
try {
switch (input.nextInt()) {
case 1:
borrowByName(input);
break;
case 2:
borrowByNumber(input);
break;
default:
System.out.println("命令输入错误！请根据提示输入数字命令！");
borrow();
break;
}
} catch(InputException e) {
}catch (InputMismatchException e) {
System.out.println("命令输入错误！请根据提示输入数字命令！");
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
} finally {
borrow();
input.close();
}
}
}
