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If you just started learning Java, give it a try. If a class have multiple methods by same name but different parameters, it is known as Method Overloading.
It increases the readability of the program. Yes, You can have many main methods in a class by overloading the main method. It is used for runtime polymorphism and to provide the specific implementation of the method.
No, you cant override the static method because they are the part of class not object. It is because the static method is the part of class and it is bound with class whereas instance method is bound with object and static gets memory in class area and instance gets memory in heap.
Method Overriding 1 Method overloading increases the readability of the program. Method overriding provides the specific implementation of the method that is already provided by its super class. Method overriding occurs in two classes that have IS-A relationship. In this case, parameter must be same. Yes, all functions in Java are virtual by default. Now, since java5, it is possible to override any method by changing the return type if the return type of the subclass overriding method is subclass type.
It is known as covariant return type. If you make any variable as final, you cannot change the value of final variable It will be constant. Final methods cant be overriden.
Final class cant be inherited. A final variable, not initalized at the time of declaration, is known as blank final variable. Java Interview Questions 51 Can we intialize blank final variable?
Yes, only in constructor if it is non- static. If it is static blank final variable, it can be initialized only in the static block. Runtime polymorphism or dynamic method dispatch is a process in which a call to an overridden method is resolved at runtime rather than at compile-time.
In this process, an overridden method is called through the reference variable of a super class. The determination of the method to be called is based on the object being referred to by the reference variable. In case of static binding type of object is determined at compile time whereas in dynamic binding type of object is determined at runtime.
Abstraction is a process of hiding the implementation details and showing only functionality to the user. Abstraction lets you focus on what the object does instead of how it does it. Abstraction hides the implementation details whereas encapsulation wraps code and data into a single unit. A class that is declared as abstract is known as abstract class.
It needs to be extended and its method implemented. It cannot be instantiated. No, if there is any abstract method in a class, that class must be abstract. No, because abstract method needs to be overridden whereas you cant override final method. No, abstract class can never be instantiated.
Interface is a blueprint of a class that have static constants and abstract methods. It can be used to achieve fully abstraction and multiple inheritance.
No, because methods of an interface is abstract by default, and static and abstract keywords cant be used together. No, because its implementation is provided by another class.
An interface that have no data member and method is known as a marker interface. For example Serializable, Cloneable etc. Abstract class 1 An abstract class can have method body nonabstract methods. Interface have only abstract methods.
An interface cannot have instance variables.