以下代碼似乎會讓IDE將回車看做字符，怎么回事？
package?caesarCipher;
import?java.util.Scanner;
public?class?unlock?{
public?static?void?main(String[]args){
Scanner?in=new?Scanner(System.in);
System.out.println("Please?type?words,there?should?be?less?than?2001.");//警告1
System.out.println("Please?check?contents,make?sure?there?is?no?character?which?goes?beyond?40-126(ASCII).The?programme?only?supports?English.");//警告2
String?words=in.nextLine();
words.replace('\r','?');
char[]?wordsList=new?char[2000];
for(int?i=0;i<words.length();i++)
wordsList[i]=words.charAt(i);
unlock(wordsList);//解密
for(int?i=0;i<words.length();i++)
System.out.print(wordsList[i]);
System.out.println();
}
public?static?void?unlock(char[]?words){
for(int?i=0;i<words.length;i++){
if(words[i]>=33){
words[i]=(char)(words[i]+219);
}
else?if(i>=37&&i<=255){
words[i]=(char)(words[i]-4);
}
else{
System.out.println("\nFind?a?character?goes?beyond?33-255?of?ASCII!!!Index:"+i);
System.exit(1);
}
}
}
}
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