FAQ: Conditionals and Control Flow - If-Then-Else

This community-built FAQ covers the “If-Then-Else” exercise from the lesson “Conditionals and Control Flow”.

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public class Order {

public static void main(String args) {

boolean isFilled = false;

// Write an if-then-else statement:

if (isFilled){
  System.out.println("Shipping");
} else {
  System.out.println("Order not ready");
  
}

}

}

Here is my solution for exercise 3/6

Why is the solution for
if (isFilled) {

  System.out.println("Shipping.");

when is Filled is set to be a false Boolean value? Is it simply testing whether isFilled exists and can be called and if so it prints the String “shipping”?

if (isFilled = true) {

  System.out.println("Shipping.");

However I also get the same message response for setting isFilled to true as the conditional when the value of isFilled is set to false (as given when you start the exercise.)

3 Likes

It’s a boolean variable, so it automatically checks if it’s true or not. By only putting if (isFilled), it is automatically checking if (isFilled==true).

isFilled=true would be incorrect, since you’re changing the variable to true as you’re doing it, so according to the lesson you wouldn’t get the right result.

5 Likes

was just about to check the same thing as was getting the same result. Didnt know booleans check by default for true if just list the variable name. Thank you!