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Mar 23

Create a Word document containing the answers to all the problems given below.

  1. Can you access an instance variable from a static method? Explain why or why not.
  2. Can you access a static variable from an instance method? Explain why or why not.
  3. Consider the case where you have two classes, ClassA and ClassB, such that ClassA contains a member variable defined as ClassBmyBobj. ClassB contains a constructor which takes a String parameter. ClassA provides a constructor which accepts a String parameter which is to be provided to myBobj. What needs to be done to initialize the ClassB member variable with the value from the ClassA constructor?
  4. Here are some class definitions with questions that follow.

public class BaseClass { // methods of BaseClass }

publicSomeClass extends BaseClass

{ // methods of SomeClass }

SomeClassscobj = new SomeClass( );

BaseClassbcobj = scobj;

SomeClass scobj2 = bcobj;

bcobj.aMethodOfSomeClass( ); // does not exist in BaseClass

Is statement b above legal, or is casting required?

Statement c is trying to assign the SomeClass object referred to by bcobj to a SomeClass reference variable scobj2. What is wrong with this statement and how would you fix it.

In statement d, a BaseClass reference is trying to access a SomeClass class method that is not part of BaseClass. Is this legal? Explain.



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