What is functional interface in java?
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What is an exception? difference between Checked and Unchecked exception in Java
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Why is java called java?
what is object deep copy and shallow copy and why it is required?
You're given a Boolean 2D matrix, can you find the number of islands?
What is the difference between synchronized and synchronized block?
What is the public field modifier?
when i write string s1="java"; in one program(application) and string s2="java"; in another application on the same jvm will both objects s2,s2 will refer to same memory location where "java" is stored in string pool.
What is immutability in java?
what is the default value of a variable char?(If not assigned)
How the metacharacters are different from the ordinary characters?
What is variable length arguments in java?
Can we print null in java?
Core Java 
