What is the difference between object oriented programming language and object based programming language?

Java Programming Language > Overview of Java Language > Benefits of OOP

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Object based programming languages follow all the features of OOPs except Inheritance. JavaScript is an example of object based programming languages.

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123. What is the purpose of default constructor?

Answer: The java compiler creates a default constructor only if there is no constructor in the class.

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Question: Overview of Java Language Short

124. Can a constructor be made final?

Answer: No, this is not possible.

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Question: Overview of Java Language Short

125. What is static block?

Answer: It is used to initialize the static data member, It is excuted before main method at the time of classloading.

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Question: Overview of Java Language Short

126. Define composition?

Answer: Holding the reference of the other class within some other class is known as composition.

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Question: Class, Object and Methods in java Short

127. What is Method/function overloading?

Answer: If a class has multiple functions by same name but different parameters, it is known as Method Overloading.

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Question: Class, Object and Methods in java Short

128. What is Method/function overriding?

Answer: If a subclass provides a specific implementation of a method that is already provided by its parent class, it is known as Method Overriding.

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Question: Class, Object and Methods in java Short

129. Difference between Overloading and Overriding?

Answer: 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 parameter must be different in case of overloading, parameter must be same in case of overriding.

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Question: Class, Object and Methods in java Short

130. What is final class?

Answer: Final classes are created so the methods implemented by that class cannot be overridden. It can

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Question: Class, Object and Methods in java Short

131. What is NullPointerException?

Answer: A NullPointerException is thrown when calling the instance method of a null object, accessing or modifying the field of a null object etc.

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Question: Managing Errors and Exception Short

132. What are the ways in which a thread can enter the waiting state?

Answer: A thread can enter the waiting state by invoking its sleep() method, by blocking on IO, by unsuccessfully attempting to acquire an object's lock, or by invoking an object's wait() method. It can also enter the waiting state by invoking its (deprecated) suspend() method.

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