Utility method to convert Boolean into boolean and handle null in Java

Question

Is there a utility method in Java which converts Boolean into boolean and automatically handles null reference to Boolean as false?

Answer 1

How about:

boolean x = Boolean.TRUE.equals(value);

? That's a single expression, which will only evaluate to true if value is non-null and a true-representing Boolean reference.

Answer 2

On java 8 you can do:

static boolean getPrimitive(Boolean value) {
        return Optional.ofNullable(value).orElse(false);
}

You can also do:

static boolean getPrimitive(Boolean value) {
        return Boolean.parseBoolean("" + value);
}

Answer 3

This would be a method you could write that would do the trick. This would return false if the Boolean is null.

public static boolean toBooleanDefaultIfNull(Boolean bool) {
    if (bool == null) return false;
    return bool.booleanValue();
}

Answer 4

I don't know whether it exists or not. I'd write a one liner like:

public static boolean getPrimitiveBoolean(Boolean bool) {    
   return bool == null ? false : bool.booleanValue();
}

Answer 5

Are you looking for a ready-made utility ? Then I think Commons-Lang BooleanUtils is the answer. It has a method toBoolean(Boolean bool).

Answer 6

If you're golfing, an explicit null check followed by automatic unboxing is shorter than the canonical answer.

boolean b=o!=null&&o; // For golfing purposes only, don't use in production code