Is null a string or object in java?
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What is overriding in java?
Does variable declaration allocate memory?
Where is java located?
use of wrapper classes?
What is difference between equals and hashcode method?
write java code to print second max number in the array
What is instance example?
What is comparable and comparator interface? List their differences
How core java/j2ee project performance can be measured ?
Does java map allow duplicates?
write a progam hashmap & hashtable?
Explain about the performance aspects of core java?