Reading Spaces from a Char Array in Java

Question

I am trying to make a program that will convert a String to Binary. To do that I converted the User Input to char array. Using for loops to read the characters in the char array one by one.

My Problem is how can I read spaces from the char Array. Here's my code.

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

        if (Character.isLetter(c)){
            System.out.print ("letter");
        }
        else if (Character.isDigit(c)){
            System.out.print ("number");
        }
        else if (c== " "){
            System.out.print ("space");
        }
        else
        {
            System.out.println ("Special Char");
        }
    }

The Errors shows bad operand types for binary operator '=='else if ((c) == " ")

score 3 · Answer 1 · answered Oct 22 '18 at 09:51

3

c is of type character and you're trying to compare it to " " which is of type string, if you want to check if c is a space you should compare it to ' ' which is also of type character.

answered Oct 22 '18 at 09:51

Mark

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score 1 · Answer 2 · answered Oct 22 '18 at 09:52

1

You can't compare a string with array.

One space character is represented by ' ' and not " "

Just change this,

if (c== " ")

to

if (c== ' ')

answered Oct 22 '18 at 09:52

Pushpesh Kumar Rajwanshi

18,127
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score 1 · Accepted Answer · answered Oct 22 '18 at 09:55

1

You are trying to compare Character with a String. That's why the error. Try using

Character.isSpaceChar(c)

Hope this works for you.

answered Oct 22 '18 at 09:55

Pranali Rasal

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`isSpaceChar` considers more types of whitespace than just the basic space (ASCII 0x20, Unicode U+0020), given the given code that might not be what the OP wants. – Mark Rotteveel Oct 23 '18 at 14:54

score 0 · Answer 4 · answered Oct 22 '18 at 09:54

While

if(c==' ')

would work for the standard whitespace character there are actually multiple different types of whitespaces like non-breaking-spaces for example.

But just like for letters and digits there already exists a function in Character to check if a character is any of those whitespaces:

if(Character.isWhitespace(c))

Reading Spaces from a Char Array in Java

4 Answers4