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Java / Inheritance

Benefits of covariant return type in Java.

It eliminates unnecessary downcasting from the super type to the subtype. For example object clone method can be overriden by implementing Clonable interface and the implementing class return the object of its own type while the object clone method returns object type.

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What are the differences between composition and inheritance in Java? Are static members inherited to sub classes? What happens if the parent and the child class have a field with same identifier? Are constructors and initializers also inherited to sub classes? How Inheritance is implemented in java? Types of inheritance. How do you restrict a member of a class from inheriting by its sub classes? How do you implement multiple inheritance in java? Can a class extend by itself in Java? Can we reduce the visibility of the inherited or overridden method? How do you override a private method in java? When to overload a method in Java and when to override it? What is the order of extends and implements keyword on Java class declaration? How do you prevent overriding a Java method without using the final modifier? Explain covariant method overriding in Java. What is covariant return type in Java? Benefits of covariant return type in Java. What are the rules of method overriding in Java? Difference between method overriding and overloading in Java. What is Virtual method/function in Java? How to prevent using overloading instead of overriding by mistake? Difference between Inheritance and Encapsulation. What happens when a class implements two interfaces and both have a method with same name and signature? What happens when a class implements two interfaces and both declare field (variable) with same name? Can a subclass instance method override a superclass static method? Can a subclass static method hide superclass instance method? What is method hiding in Java? Can we pass an object of a subclass to a method expecting an object of the superclass? Can a superclass access subclass members?
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