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Is java an open source?
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Q) I have a ArrayList object, in that object i have added 5 integer values, 5 float values, 5 string values. Now question is how can delete particular type of data ( i.e all int values or all float values or string values) in that list object at a time?
How do you use wildcards?
Is java pure object oriented or not? if yes, give the valid reason.
13 Answers Emphasis, NIIT, Syntel, Wipro,
What does provide mean construction?
without using arthematic operation ,how can you write the logic for adding/substraction/multiplication?
7 Answers Tanla Solutions, Wipro,
Why char array is preferred over string for storing password?
What is flag in java?
What is difference between static and final?
Is 'sizeof' a keyword?
Can you pass by reference in java?
what is collatration?
Are the equals() and hashCode() protected methods of object class?
Core Java 
