can we take more than one null values for Unique
constraints.
Difference between concurrent hashmap and hashtable and collections
What is meant by null and void?
What do you understand by classes in java?
what is difference between prepare stetement and callable starement with example?
What is the main advantage of passing argument by reference?
What are variable arguments or varargs?
What is difference between static class and singleton pattern?
What is java lang string?
What is the difference between processes and threads?
Why runnable interface is used in java?
What is bigger kb or mb?
Can an integer be a string?