視頻一點(diǎn)點(diǎn)看過(guò)來(lái)的，每個(gè)小結(jié)的案例都跟著做，事后也能自己寫出來(lái)。但是一到最后的小項(xiàng)目就蒙了，大體思路有但是小的細(xì)節(jié)實(shí)現(xiàn)老是出錯(cuò)。

第三期的圖書系統(tǒng)，我參照上一期的租車，做個(gè)book類給每本書序號(hào)sn和書名name，結(jié)果不懂怎么把輸入書名inputName與每個(gè)book對(duì)象的name做循環(huán)判斷。

看著別人的代碼整體仿寫，結(jié)果tyr-catch的時(shí)候無(wú)論try里面是否有問(wèn)題，都會(huì)順序走到catch里面，哪里的問(wèn)題啊。。。

package?com.imooc.LoanDesk;

import?java.util.InputMismatchException;
import?java.util.Scanner;

public?class?LoanDesk?{
	
	//?Book[]?b?=?{new?Book(1,"數(shù)據(jù)結(jié)構(gòu)"),?new?Book(2,"高等數(shù)學(xué)"),?new?Book(3,"Java核心1"),?new?Book(4,"Java核心2")};
	String[]?book?=?{"數(shù)據(jù)結(jié)構(gòu)",?"高數(shù)",?"Java核心技術(shù)卷一",?"Java核心技術(shù)卷二"};
	
	//?command()接受輸入并返回1或2，不是整數(shù)拋出錯(cuò)誤，不是1或2拋出錯(cuò)誤
	public?int?command()?throws?Exception?{
		
		int?i;
		Scanner?input?=?new?Scanner(System.in);
		System.out.println("如何查找圖書？1.按名稱?2.按序號(hào)");
		try?{
			i?=?input.nextInt();
		}?catch?(InputMismatchException?e)?{
			throw?new?InputMismatchException("請(qǐng)輸入數(shù)字！程序結(jié)束！");
		}
		if?((i!=1)?||?(i!=2))?{
			throw?new?OtherException("請(qǐng)輸入1或2！");
		}
		return?i;
	}
	
	//?searchName()接收先接受
	public?void?searchName()?throws?NoBookException?{
		//?Book?a?=?new?Book();
		System.out.print("請(qǐng)輸入書名：");
		Scanner?input?=?new?Scanner(System.in);
		String?name?=?input.nextLine();
		for?(int?i=0;?i?<?book.length;?i++)?{
			if?(name.equals(book[i]))?{
				System.out.println("找到了！正在為《"+book[i]+"辦理手續(xù)！");
				break;
			}?
			if?(i?==?book.length)?{
				throw?new?NoBookException("沒(méi)有這本書。");
			}
		}
	}
	
	//?searchSN()
	public?void?searchSN()?throws?NoBookException?{
		Scanner?input?=?new?Scanner(System.in);
		int?i?=?input.nextInt();
		if?(i>0?&&?i<book.length)?{
			System.out.println("找到了！正在為《"+book[i]+"》辦理手續(xù)！");
		}?else?{
			throw?new?NoBookException("沒(méi)有這么多書啊。。");
		}
	}
	
	//?主程序
	//?在while循環(huán)中，用command()詢問(wèn)并接受查找方式s
	//?詢問(wèn)并接收書名并調(diào)用searchName()獲取結(jié)果or詢問(wèn)并接收序號(hào)并調(diào)用searchSN()獲取結(jié)果
	public?static?void?main(String[]?args)?{

		Scanner?input?=?new?Scanner(System.in);
		LoanDesk?ld?=?new?LoanDesk();
		int?s?=?0;?
		
		while?(true)?{
			try?{s?=?ld.command();}?catch?(Exception?e)?{System.out.println("輸入錯(cuò)誤，但是詳情顯示不出來(lái)！");}
			switch?(s)?{
			case?1:?try?{
					ld.searchName();
				}?catch?(NoBookException?e)?{
					e.printStackTrace();
					System.out.println("通過(guò)此書名找不到");
				}?break;
			case?2:?try?{
					ld.searchSN();
				}?catch?(NoBookException?e)?{
					e.printStackTrace();
					System.out.println("通過(guò)此序號(hào)找不到");
				}?
			}
		}
		
	}
}