The role of Files is regal, to any computer language, without the capacity of file handling, the computer language is little more than useless.
Why files are used?... (more)
DBMS (Database Management Systems)
A database is an organized collection of data on which (business) decisions are made. A DBMS is a computer system that manages the database, i.e. it provides an interface between the user and the actual database stored in a hard disk somewhere. The concept of d... (more)
a button has a action listener as you perform action on it. a button doesn't have 'states' like a checkbox has a check box is either checked or unchecked so it has an item state change listener.
the action listener is in awt package so you need to import it.... (more)