Java: what is the difference between format specifiers% X and% H?

Looking at the specification page, I see that% h calls integer Tohexstring(), but I can't find any actual difference between the two specifiers

Can you give an example of how using the to specifier on the same input will produce different results?

System.out.println(String.format("%1$h %1$x",123));

This print

7b 7b

Solution

%The H specifier calls hashcode on its parameters (assuming it is not null, when you get "null"), while the% x specifier just formats its parameters as hexadecimal integers This makes a big difference if the formatted thing is not an integer See the example here:

http://developer.android.com/reference/java/util/Formatter.html

In particular, the fact that integers get the same result is integer Hashcode returns the result of the integer itself:

http://docs.oracle.com/javase/6/docs/api/java/lang/Integer.html#hashCode%28%29