New to Java

Hello All,

I am doing the following:

public String stringToBinary(String input) {
                     int intRepresentation = Integer.parseInt(input, 16);
                     String binaryString = Integer.toBinaryString(intRepresentation);
                     return(binaryString);
 }

I need the leading zeros though for my project, they are crucial. For example for the input:

'03' I need the function to return '00000011' not '11' like it does currently.

Another example, if input was '36' then I need it to return '0011 0110'.

Thanks guys!