What is the purpose of interface?
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Explain the difference between arraylist and linkedlist in java?
How does arraylist size increase in java?
what is multithreading?
Is object a data type in java?
How do I compare two strings in word in java?
Give example to differentiate between call by value and call by reference.
What is map and hashmap? also tell the difference.
Why singleton class is used in java?
Difference between String and StringBuffer.
String class is defined under which package in java?
Is 'null' a keyword?
what are the states associated in the thread? : Java thread