Difference between concurrent hashmap and hashtable and collections
What is jar?
What are library required to connect to excel sheet.
what is object type casting? give some example with related?
how to call One constructor from another;
How do you use equal in java?
what is abstract class in Java?
Is void a return type?
What do you mean by order of precedence and associativity?
What is the use of optional ?
In method overloading ,if i change the return type to Long instead of INT,is the program execute
How do you do descending order in java?
How many ways can we create singleton class?