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

So your program must be something like this.

public class BooleanBug {

    public static String bool(Boolean param) {
        if ((null != param) && param.booleanValue() == true) {
            return "a";
        } else if ((null != param) && param.booleanValue() == false) {
            return "b";
        }
        return "c";

    }

    public static void main(String[] args) {

        System.out.println(bool(true));
        System.out.println(bool(null));
        System.out.println(bool(false));

    }
}