                        課程
                    
                        /后端開(kāi)發(fā)
                        
                            /Java
                        
                        /Java入門(mén)第三季

Scanner獲取鍵盤(pán)輸入總是出錯(cuò)，比如我輸入"英語(yǔ)"，debug里顯示的值有時(shí)是"yingyuying英語(yǔ)"，有時(shí)候又是正常的"英語(yǔ)",請(qǐng)問(wèn)是源碼哪里有問(wèn)題嗎？

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,"高數(shù)"),new?Book(2,"線代"),new?Book(3,"工數(shù)")
???????		?,new?Book(4,"電路"),new?Book(5,"模電"),new?Book(6,"數(shù)電"),
???????		?new?Book(7,"英語(yǔ)"),new?Book(8,"毛概")};
????????System.out.println("歡迎使用圖書(shū)館借書(shū)系統(tǒng)！輸入：1-按名稱(chēng)查找書(shū)籍??2-按序號(hào)查找書(shū)籍");
????????Scanner?sc=new?Scanner(System.in);
????????
????????	int?i=sc.nextInt();
????????try{
????????	if(i!=1?&&?i!=2){
????????		throw?new?BadCommand("輸入有誤！請(qǐng)按提示輸入數(shù)字命令");
????????	}
????????
????????if(i==1){
????????	System.out.println("請(qǐng)輸入圖書(shū)名稱(chēng)：");
????????	String?name=sc.next();//就是這里總是出錯(cuò)！
????????	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("圖書(shū)不存在！");
????????	}
????????}else?if(i==2){
????????	System.out.println("請(qǐng)輸入圖書(shū)序號(hào)：");
????????	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("圖書(shū)不存在！");
????????	}
????????}
????????}catch(BadCommand?e1){
????????	System.out.println(e1.getMessage());
????????}
????????catch(NoExist?e2){
????????	System.out.println(e2.getMessage());
????????}
	}
	
}

//測(cè)試

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("請(qǐng)輸入：");
?????????????String?name=sc.next();//這里接收到的字符串又是對(duì)的。
?????????????Book?[]?bookForBorrow={new?Book(1,"高數(shù)"),new?Book(2,"線代"),new?Book(3,"工數(shù)")
????????????		?,new?Book(4,"電路"),new?Book(5,"模電"),new?Book(6,"數(shù)電"),
????????????		?new?Book(7,"英語(yǔ)"),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!");

}
}

補(bǔ)充一個(gè)我測(cè)試的代碼，這個(gè)接收到的又是對(duì)的