Define immutable object?

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An immutable object can

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Answer: It is a collection of element which cannot contain duplicate elements. The Set interface contains only methods inherited from Collection and adds the restriction that duplicate elements are prohibited.

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116. Difference between throw and throws?

Answer: It includes:

Throw is used to trigger an exception where as throws is used in declaration of exception.
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117. Explain the following line used under Java Program ? public static void main (String args[ ])

Answer: The following shows the explanation individually ?

public ? it is the access specifier.

static ? it allows main() to be called without instantiating a particular instance of a class.

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118. Define JRE i.e. Java Runtime Environment?

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

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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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