救命，老師快救我。阿阿阿阿阿阿阿阿阿阿

import java.io.*;
import java.util.*;
public class jva110
{
public static void main(String arg[])
{
//取得出題數量
int userItemCoount = arg.length / 2;
//是否為使用者出題(自由出題)
Boolean isUserItem = (userItemCoount > 0);
//宣告題目陣列
String itemQue[];
String itemAns[];
//判斷是否是自由出題
if(isUserItem)
{
//是自由出題
//建立陣列
itemQue = new String[userItemCoount];
itemAns = new String[userItemCoount];
//寫入題目
for(int i=0;i<arg.length;i+=2)
{
itemQue[i/2] = arg[i];
itemAns[i/2] = arg[i+1];
}
}else{
//是預設題目
itemQue = new String[]{"電腦","資料庫","語法","學校","假期"};
itemAns = new String[]{"computer","database","syntax","school","Vocation"};
}
//紀錄開始時間
long startTime = new Date().getTime();
//顯示資訊
System.out.println("請將題目的中文字彙翻譯成英文單字!");
System.out.println("輸入英文單字答案後請按Enter鍵:\n");
//輸入擷取物件
Scanner scanner =new Scanner(System.in);
//宣告答對題目數變數
int Right=0;
//開始出題
for(int i=0;i<itemQue.length;i++)
{
System.out.println("第" + (i+1) +"題__ " + itemQue[i]);
String useInput = scanner.next();
String ans = itemAns[i].toLowerCass();
useInput = useInput.toLowerCass();
if(useInput.equals(ans))
{
System.out.println("答對了！");
Right++;
}else{
System.out.println("答錯了！");
System.out.println("正確答案是" + itemAns[i]+"\n");
}
}
//結算時間
long endTime = new Date().getTime();
long useTime = (endTime-startTime)/1000;
System.out.println("你使用了" + useTime + "秒，在" + itemQue.length + "題中答對了" + Right + "題");
}
}

複製代碼

老師，為甚麼一直有兩個錯誤訊息

錯誤訊息如下
jva110.java:54: error: cannot find symbol
                     String ans = itemAns.toLowerCass();
/ D/ U- {! P  u1 D* z, L                                              ^. W$ b* y1 j3 g* n6 n* n; j7 a
  symbol: method toLowerCass()% v9 I8 {' @$ t
  location: class String. J7 _# @2 M* s1 j7 d
jva110.java:55: error: cannot find symbol
  {1 o7 X' Z/ m3 a3 E" i                      useInput = useInput.toLowerCass();
, F6 h# C  A( X                                        ^
) J# P: y* y/ A! x7 B  symbol: method toLowerCass()9 j' Q. S/ u. h; s3 y6 v
  location: variable useInput of type String" c; x- `) w4 R1 b
2 errors