CODEWITHSUNDEEP
java
Saurabh Kumar
Saurabh Kumar

Reputation: 16651

Why does this not cause a NullPointerException?

public class Null {
    public static void greet() {
        System.out.println("Hello world!");
    }

    public static void main(String[] args) {
        ((Null) null).greet();
    }
}

program output: Hello world!.
I thought it would throw a NullPointerException.

Why is it happenning?

Upvotes: 6

Views: 307

Answers (2)

Miserable Variable
Miserable Variable

Reputation: 28752

The reason is that greet() is a static method. References to static methods via variables do not result in dereferencing the pointer. The compiler should have warned you about this.

If you remove the static modifier then you will get the npe

Upvotes: 7

amit
amit

Reputation: 178411

method greet() is static, thus it does not need an enclosing instance of Null. Actually, you can [and should] invoke it as: Null.greet();

Upvotes: 12

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