What decimal value does some hexadecimal constant have in Android -

problem

in following code, decimal value 0x02, 0x03, 0x04? hexadecimal numbers? difference when x letter upper case , lower case?

code

public class certainlibraryclass {     public class activityresultcode {     public static final int code_a = 0x02;     public static final int code_b = 0x03;     public static final int code_c = 0x04;     } // .... } 

yes, hexidecimal numbers. case of x not make difference. correct, methods public can called outside of class.