//Books.java, 处理图书查询流程的类
package com.imooc.bookmanagement;
import java.util.*;
public class Books {
private String[] book = {new String("高数"), new String("数据结构")};
private Scanner c = null;
private boolean flagNotFound = true;
private int searchMethod() throws WrongCommandException{
int k = 0;
System.out.println("请输入命令：1-按照名称查找图书；2-按照序号查找图书");
try{
c = new Scanner(System.in);
k = c.nextInt();
if (k == 1 || k == 2){
}
else{
System.out.println("命令输入错误！请根据提示输入数字命令！");
throw new WrongCommandException("命令输入错误！");
}
}catch (InputMismatchException e){
throw new WrongCommandException("命令输入错误！");
}
return k;
}
private int searchBookByName() throws BookDoesNotExistException{
int i = 0;
System.out.println("请输入图书名称:");
c = new Scanner(System.in);
String s = c.next();
for(i = 0; i < book.length; i++){
if(s.equals(book[i])){
return i;
}
}
throw new BookDoesNotExistException("图书不存在！");
}
private int searchBookByNumber() throws BookDoesNotExistException{
int i = 0;
System.out.println("请输入图书序号:");
try{
c = new Scanner(System.in);
int s = c.nextInt();
for(i = 0; i < book.length; i++){
if(s == i+1){
return i;
}
}
throw new BookDoesNotExistException("图书不存在！");
}catch (Exception e){
throw new BookDoesNotExistException("图书不存在！");
}
}
public void processing(){
int bookNumber;
int k = 0;
while(flagNotFound){
try{
k = searchMethod();
if(k == 1){
try{
bookNumber = searchBookByName();
flagNotFound = false;
System.out.println("book:"+book[bookNumber]);
}catch (BookDoesNotExistException e){
System.out.println("图书不存在！");
flagNotFound = true;
}
}
else if (k == 2){
try{
bookNumber = searchBookByNumber();
flagNotFound = false;
System.out.println("book:"+book[bookNumber]);
}catch (BookDoesNotExistException e){
System.out.println("图书不存在！");
flagNotFound = true;
}
}
}catch(WrongCommandException e){
System.out.println("命令输入错误！请根据提示输入数字命令！");
flagNotFound = true;
}
}
if(c!=null)
c.close();
}
}//BookDoesNotExistException.java, 图书不存在异常类
package com.imooc.bookmanagement;
public class BookDoesNotExistException extends Exception {
public BookDoesNotExistException(){
}
public BookDoesNotExistException(String message){
super(message);
}
}//WrongCommandException.java, 错误命令异常类
package com.imooc.bookmanagement;
public class WrongCommandException extends Exception {
WrongCommandException(){
}
WrongCommandException(String message){
super(message);
}
}//BookManagement.java, 主类
package com.imooc.bookmanagement;
public class BookManagement {
public static void main(String[] args) {
Books book1 = new Books();
book1.processing();
}
}
