java.lang.NullPointerException with boolean

Question

I wrote a realy simple code based on another question and here it is:

It throws me an error

java.lang.NullPointerException line 5 and 17

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Answer 1

You used the Boolean instead of boolean. Boolean is a class, which means you can assign objects to it. In your case, you passed in a null, which is then assigned to param. You then tried to use param, which of course resulted in a NullPointerException.

You can:

• Get rid of the line bool(null)
• Change Boolean to boolean in the parameters for bool()
• Add an else if for when param is null