My if statement ALWAYS returns true, no matter what

Question

This just is\'t making sense to me at all.

This is my code:

boolean that = false;
        if (that == true);
        {
            System.out.println         


        

Answer 1

A common mistake. Remove the ; at the end of the if statement.

BTW I always write the following if I use brackets and I use the code formatter of the IDE.

    if (that == true) {
        System.out.println("That is " + that);
    }

This means if you have a mis-placed ; or { it can be more obvious.

Answer 2

Try it like this:

    boolean that = false;
    if (that)
    {
        System.out.println("That is " + that);
    }

Notice the extra semi-colon after the if in your code? That's why.

The logical test is closed by the semi-colon, then the next block is always executed.

If you remove the semi-colon it'll match your intuition.

Answer 3

Remove the ;

boolean that = false;
     if (that == true)
     {
         System.out.println("That is " + that);
     }

otherwise the print is always executed.

Answer 4

It's because of the semicolon you have here:

 if (that == true);

Remove that semicolon ! It causes the code to do nothing after checking the conditional (that == true) - technically it's an "empty statement" - i.e. we can have a loop like so:

    for (int i = 0; ; i++){
      System.out.println("Thanks" );
    }

And it would go forever!

Answer 5

if (that == true);
              // ^ The extra colon you dont need