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Using a Variable or Array Element That Is Uninitialized and Unassigned
When we are using uninitialised variables or unassigned varibales then we must know about what type of variable or what type of array we we are dealing with primitive or objects .becouse that time we can get diff behavior. but the java gives us a option of intialising a declared varibale or leaving it uninitialised. And our behavior also depend on the varibale  or level at which we are declaring our variable.right now we have a two variable which are using right now .
> Instance variable
> Local variable
         Instance variable is bassically declared with in the class but outside any method or constructor. But in the case of Local variable its declared with in the method or in the argument list of the method.