Java - How do if statements know the values of a Boolean object?

Question

How do if statements recognize the Boolean object as a boolean? such as:

Boolean b = new Boolean(true);
if(b){
    System.out.println("true!");
} else {
    System.out.println("false!");
}

This would print true, but how is Boolean recognized?

See https://docs.oracle.com/javase/tutorial/java/data/autoboxing.html — d.j.brown, Nov 12 '16 at 02:03
BTW You should use a primitive instead of a wrapper where possible esp if you are not expecting the value to be null. — Peter Lawrey, Nov 12 '16 at 04:03

score 4 · Accepted Answer · edited May 23 '17 at 12:24

4

It is called autoboxing and works for primitive types in Java, look here for a brief SO explanation or here for the official documentation. Java automatically converts the object representation Boolean into the corresponding primitive type boolean and back. The first is called unboxing and the latter boxing.

edited May 23 '17 at 12:24

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answered Nov 12 '16 at 02:05

thatguy

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Java - How do if statements know the values of a Boolean object?

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