java is digit
The java.lang.Character.isDigit(char ch) is an inbuilt method in java
which determines whether a specified character is a digit or not.
// two characters
char c1 = 'A', c2 = '4';
// Function to check if the character
// is digit or not
System.out.println(
c1 + " is a digit -> "
+ Character.isDigit(c1));
System.out.println(
c2 + " is a digit -> "
+ Character.isDigit(c2));