how to get indication of special charater read from file in java

Question

In java I am writing a code in which I am reading a text file using DataInputStream.read() method and I want to get indication if the character read from the file is other than a digit(0,1,2,...) or alphabet(a,b,c,...). Please help how I can do that?

Answer 1

try this:

char c = //read a char

if( c >= 'a' && c <= 'z'){
 //is a lower case alphabet
}
else if (c >= '0' && c <= '9'){
// is a number
}else{
  //is something else
}