保留单词java之间的空格

Question

I have a method with two inputs. The problem is when I type something like fast car.When it returns the message after the calculations I will get idvwfdu it gets rid of the space between the two words, but I want idvw fdu. How can I fix that?

for (int i=0; i<text.length();i++){
       char c=text.charAt(i);
       char character=(char)(c+shift);

       if (character >='a' && character <='z'){

          newMsg+=character;

       }else if(character > 'z') {

          newMsg+=(char)((char)(c-(26-shift)));
       }


}

return newMsg;

Answer 1

There are two issues with your code. First one is that you are shifting every character before checking like here

char character=(char)(c+shift); // you already lost space character here

and secondly you are losing the space here

if (character >='a' && character <='z'){

     newMsg+=character;

   }else if(character > 'z') { // space will be shifted once again

      newMsg+=(char)((char)(c-(26-shift)));
   }

So in order to fix this you have to keep both evaluation in mind and the result should look like this

String text = "fast car";
String newMsg = "";
int shift = 1;
for (int i = 0; i < text.length(); i++) {
      char c = text.charAt(i);
      char character = (char)(c != ' ' ? c + shift : c); // first space check

      if (character >= 'a' && character <= 'z') {

          newMsg += character;

      } else if (character == ' ') newMsg += ' '; // second space check
      else if (character > 'z') {

          newMsg += (char)((char)(c - (26 - shift)));
      }

System.out.println(newMsg); // prints gbtu dbs

Answer 2

If your concern is just about the space not being preserved,

Replace

if (character >='a' && character <='z'){

with

if ((character >='a' && character <='z') || character == ' '){

Answer 3

Add a condition for the space character in for loop and continue.

for (int i=0; i<text.length();i++){

   char c=text.charAt(i);

   if( c== ' '){
       newMsg+=c;
       continue;
    }
  ......

}