Does java vector allow null?
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Why is stringbuffer not immutable?
What is factor r?
What does isempty () do in java?
What is a map? What are the implementations of map?
How is tree Mirroring implemented?
Is ++ operator is thread safe in java?
Given: 11. public static void main(String[] args) { 12. Integer i = uew Integer(1) + new Integer(2); 13. switch(i) { 14. case 3: System.out.println(”three”); break; 15. default: System.out.println(”other”); break; 16. } 17. } ‘What is the result? 1 three 2 other 3 An exception is thrown at runtime. 4 Compilation fails because of an error on line 12.
Which collection is thread safe in java?
What do you understand by garbage collection in Java? Can it be forced to run?
What is the difference between error and an exception?
Explain the difference between serializable and externalizable in java?
What is the meaning of immutable regarding string?