Question

Which one is better Java coding style?

boolean status = true;
if (!status) {
    //do sth
} else {
    //do sth
}

or:

if (status == false) {
    //do sth
} else {
    //do sth
}

Answer 1

Former, of course. Latter is redundant, and only goes to show that you haven’t understood the concept of booleans very well.

One more suggestion: Choose a different name for your boolean variable. As per this Java style guide:

is prefix should be used for boolean variables and methods.

isSet, isVisible, isFinished,
isFound, isOpen

This is the naming convention for
boolean methods and variables used
by Sun for the Java core packages.

Using the is prefix solves a common
problem of choosing bad boolean names
like status or flag. isStatus or
isFlag simply doesn’t fit, and the
programmer is forced to chose more
meaningful names.

Setter methods for boolean variables
must have set prefix as in:

void setFound(boolean isFound);

There are a few alternatives to the
is prefix that fits better in some
situations. These are has, can and
should prefixes:

boolean hasLicense();
boolean canEvaluate();
boolean shouldAbort = false;