What is JAR file?

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JAR files is Java Archive fles and it aggregates many files into one. It holds Java classes in a library. JAR files are built on ZIP file format and have .jar file extension.

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120. What is a WAR file?

Answer: This is Web Archive File and used to store XML, java classes, and JavaServer pages. which is used to distribute a collection of JavaServer Pages, Java Servlets, Java classes, XML files, static Web pages etc.

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Question: Overview of Java Language Short

121. Define JIT compiler?

Answer: It improves the runtime performance of computer programs based on bytecode.

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Question: Overview of Java Language Short

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

Answer: 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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Question: Overview of Java Language Short

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

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