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Why do I have a NullPointerException?

Java does not have pointers then why does it have nullpointerexception ?

  • Answer:

    Pointers are used in Java implementation for references (Oracle JDK is implemented in C++) who develop/implement the language. It is just that pointers are not accessible to developers who use it.

Sasanka Pradhan at Quora Visit the source

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Java is full of pointers. All references are actually pointers. Just that you cannot do any operations on them except assignments. Also null pointer means the method/field of the object you are trying to access does not exist, or is null, that is the reference is not pointing to an object that actually exists.

Bikram Kashyap

Java does use pointers internally, it just doesn't expose them to its users (Java programmers). The implementation of references use pointers internally, it's just that the pointer logic is hidden. In other words references are really an abstraction of pointers, so in keeping with their abstraction the language designers probably should have named the the exception: NullReferenceException, alas they probably were thinking in terms of the underlying implementation when they name it rather than the abstraction that they were presenting to users.

Anonymous

Coder don't code Pointers in Java but Java internally uses Pointers. A Refernce is a Pointer.

Vivek Vermani

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