Hi friends am new to java. I read jar file means collection of java files. For executing struts application what are the necessary jar files. " struts.jar " file contains what. can u explain

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5 Coding best practices you learned in java?

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How many threads can java run?

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Mention the default values of all the elements of an array defined as an instance variable.

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What are class members by default?

0 Answers   Hexaware,

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When you say String is immutable, what do you mean by that? Say I have String s = "Ness" s= s+"Technologies"; What will happen? If the value gets appended, then what is the meaning of immutable here?

5 Answers   Ness Technologies,

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Can we extend singleton class in java?

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FOR EXAMPLE WE R HAVING TWO LIST ELEMENTS ..BOTH LISTS CONTAINS ID,NAME,PLACE ..I NEED TO COMPARE BOTH IDS IN TWO LISTS,IF ID'S R SAME MEANS WE HAVE ADD THE DETAILS(LIKE NAME,PLACE) TO MAP...HOW IS POSSIBLE ?CAN ANY ONE SUGGEST?

1 Answers  

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Explain covariant method overriding in java.

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What code optimizations techniques you follow in general practice?

2 Answers   Accenture, TCS, Wipro,

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What is the use of using enum to declare a constant?

0 Answers   Fidelity,

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Is it safe for adding 10,00,000 records/objects to HashMap?, i.e is it safe to add millions of objects to HashMap?

2 Answers  

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