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|Java - Interview Questions and Answers|
|Ans. Yes, we can do that. Compiler wont complain. But using object reference we can only access methods which have been defined for object class i.e clone(), equals(), hashCode(), toString() etc.|
We cannot access methods defined in String class or in any class in hierarchy between String and Object.
For example - we cannot do obj.append("abc") as it will now give compile time error.
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|Like Discuss Correct / Improve  object initialization  object declaration   runtime polymorphism  object oriented programming (oops)  oops concepts|
|What are the difference between composition and inheritance in Java?|
|What is the difference between Encapsulation and Abstraction?|
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|What is Polymorphism in Java ?|
|Why every object constructor automatically call super() in Object before its own constructors?|
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|Difference between Composition and Inheritance ?|
|How compiler handles the exceptions in overriding ?|
|Which of the following is tightly bound ? Inheritance or Composition ?|
|What are the features of encapsulation ?|