package Library;
import java.util.Scanner;

public class Test03 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Book [] bookForBorrow={new Book(1,"高数"),new Book(2,"线代"),new Book(3,"工数")
       		 ,new Book(4,"电路"),new Book(5,"模电"),new Book(6,"数电"),
       		 new Book(7,"英语"),new Book(8,"毛概")};
        System.out.println("欢迎使用图书馆借书系统！输入：1-按名称查找书籍  2-按序号查找书籍");
        Scanner sc=new Scanner(System.in);
        
        	int i=sc.nextInt();
        try{
        	if(i!=1 && i!=2){
        		throw new BadCommand("输入有误！请按提示输入数字命令");
        	}
        
        if(i==1){
        	System.out.println("请输入图书名称：");
        	String name=sc.next();//就是这里总是出错！
        	int f=0;
        	for(Book book:bookForBorrow){
        		if(book.getBookname().equals(name)){
        			f=1;
        			String fName="book:"+name;
        			System.out.println(fName);
        			break;
        		}
        	}
        	if(f==0){
        		throw new NoExist("图书不存在！");
        	}
        }else if(i==2){
        	System.out.println("请输入图书序号：");
        	int k=sc.nextInt();
        	int m=0;
        	for(int a=0;a<bookForBorrow.length;a++){
        		if(bookForBorrow[a].getOrderNum()==k){
        			String fname="book:"+bookForBorrow[a].getBookname();
        			System.out.println(fname);
        			m=1;
        			break;
        		}
        	}
        	if(m==0){
        		throw new NoExist("图书不存在！");
        	}
        }
        }catch(BadCommand e1){
        	System.out.println(e1.getMessage());
        }
        catch(NoExist e2){
        	System.out.println(e2.getMessage());
        }
	}
	
}

//测试

package Library;

import java.util.Scanner;

public class Test02 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
             Scanner sc=new Scanner(System.in);
             System.out.println("请输入：");
             String name=sc.next();//这里接收到的字符串又是对的。
             Book [] bookForBorrow={new Book(1,"高数"),new Book(2,"线代"),new Book(3,"工数")
            		 ,new Book(4,"电路"),new Book(5,"模电"),new Book(6,"数电"),
            		 new Book(7,"英语"),new Book(8,"毛概")};
             for(int i=0;i<bookForBorrow.length;i++){
            	 /*if(book.getBookname().equals(name)){
            		 String fName="book:"+name;
            		 System.out.println(fName);
            		 break;*/
            		 if(bookForBorrow[i].getBookname().equals(name)){
                		 String fName="book:"+name;
                		 System.out.println(fName);
                		 break;
            	 }
             }
             System.out.println("over!");

}
}

补充一个我测试的代码，这个接收到的又是对的