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Explain what happens if you: Attempting to refer to an instance field or instance method in...

Explain what happens if you:

  • Attempting to refer to an instance field or instance method in a static method.
  • In a method that accepts an object as an argument, writing code that accidentally modifies the object.
  • Allowing a null reference to be used.

       What is the course of actions that you should take to avoid these situations.

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Answer #1

WHEN ACCESSING THE INSTANCE FIELD FROM STATIC METHOD

The static method can only accept the static variables.Therefore,
the static method throws an error that the non-static or instance variable
cannot be referenced from the static method.


COURSE OF ACTION TO BE TAKEN WHEN ACCESSING
A NULL REFERENCE OBJECT

In a method that accepts an object as an argument ,then there is a probability
of modify the object .So, we need to pre-check using if case that do modify
the object only if the object is not null.So that that null reference is not thrown when user try to modify it.

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