public - public means everyone can access it.That means it's in global scope. As, main method is called by JVM [ Java Virtual Machine...

throw is used to throw an exception in a program, explicitly . Whereas,  throws is included in the method's declaration part, wi...

   Singleton in one of the most popular yet controversial design pattern, in the world of object oriented programming. It's one of t...

Web Container / Servlet Container / Servlet Engine : In J2EE Architecture , a web container (also known as servlet container or ser...

    ORM ( Object Relational Mapping ) is a programming concept of a mapping between Object Oriented Programming and Relational Database ...

      In Java Programming Language , we must declare a variable name and type, before using it. The data type of a variable defines the th...

Vector :               It's synchronized.               It's slower than ArrayList.               It's generally used in ...

 Program compiles. But at runtime throws an error “NoSuchMethodError”.