true && !true

[SirFalcon]

Can someone explain to me what true && !true does?

Here is a sample code:

		int a,b,c,d;
		a = 10;   b = 4;   c = 2;   d = 3;
		if ((c + 2 < d) || ((c * d) == (a - b))) 
				if (true || (true && !true)) 
					System.out.print("X");
				else {
					System.out.print("Y");
					System.out.print("Z");
				}

I know that the nested if is executed since ((c * d) == (a - b)) = TRUE. However, if I change the nested IF to if (true && !true) instead, I don't get why Y and Z is printed. Doesn't it mean TRUE or NOT TRUE and thus X would always be printed?

[Fubarable]

1) what is !true? In other words, what is (not) true?

2) what is anything && the answer to question 1) above

3) regardless of this answer, what is (true || anything)?

[Fubarable]

if (true && !true) instead, I don't get why Y and Z is printed. Doesn't it mean TRUE or NOT TRUE

Nope. You'd better look up what is used for AND and what is used for OR in Java. This is a basic concept that you'll need as you go forward.

[SirFalcon]

Hmm, I see. Thanks for the replies.