Check if a certain char is a certain letter java

Asked Apr 17 '16 at 22:34

Active Apr 17 '16 at 22:37

Viewed 36 times

I'm working in coding bat and one of the questions requires me to check if a certain char in a string is a certain letter. Then it returns an error:

Error:  if (starttwochars.charAt(0) == "o")
Incompatible operand types char and String

Here is my code:

public String startOz(String str) {
  String starttwochars = str.substring(0,1);
  if (starttwochars.charAt(0) == "o"){
    if (starttwochars.charAt(1) == "z") {
      return "oz";
    }

    else {
      return "o";
    }
  }

  else {
    if (starttwochars.charAt(1) == "z") {
      return "z";
    }

    else {
      return "";
    }
  }
}

Please tell me how I'm supposed to see if the certain char is the string. Thanks in advance

edited Apr 17 '16 at 22:37

Maljam

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asked Apr 17 '16 at 22:34

Sruthi Kurada

3

Use a char literal, not a string literal: `== 'o'`. – Andy Turner Apr 17 '16 at 22:35
double quotes `"o"` are used for Strings and single quotes `'o'` are used for char – Maljam Apr 17 '16 at 22:36
4

Perfect dupe: http://stackoverflow.com/q/15992110/1743880. Goldies, to your hammer :)! – Tunaki Apr 17 '16 at 22:37
Oh! Thanks it worked – Sruthi Kurada Apr 17 '16 at 22:37
Try `Character.isLetter`. – Mr. Polywhirl Apr 17 '16 at 22:39
1

Note also: `str.substring(0,1)` has 1 character (the second parameter is exclusive). You'd need to use `str.substring(0,2)` to get the first two. But it's actually just easier to use `char first = str.charAt(0), second = str.charAt(1);`. – Andy Turner Apr 17 '16 at 22:41

Check if a certain char is a certain letter java

0 Answers0