Character Utility Class

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int asciiValue = (int) 'A'
- 'A' - 0 - Zero as an integer, works only for alphabets, returns ASCII values of the alphabet
  - int intValueOfChar = 'A' - 0;//65
Integer representation of a integer Character with int casting or subtraction with character 0
int x = '9' - '0'; is used to convert a character representing a digit to its corresponding integer value.
- In ASCII, the characters ‘0’ to ‘9’ are represented by consecutive values (48 to 57, respectively).
- If c is ‘0’, then c - ‘0’ evaluates to 48 - 48, resulting in 0.
- If c is ‘1’, then c - ‘0’ evaluates to 49 - 48, resulting in 1.
- If c is ‘2’, then c - ‘0’ evaluates to 50 - 48, resulting in 2
int x = Character.getNumericValue(c); does the same as above

Use only for numerical characters to get the int value from character

While comparing individual characters of a String, this comes handy.

Character.toLowerCase('A')

Note: To evenly handle even an odd length Strings, use While loop with the condition start < end with pointers running from both end

Identify if a character is alphanumeric or Skipping punctuation marks

Character.isLetterOrDigit(str.charAt(i))

char c = '9';
Character.isDigit(c);//True
c = 'S';
Character.isLetter(c).//True

Finances