Computer applications with bluej class 9 pdf

How does a computer work for Class 9?
Answer: The computer consists of the processor, the input unit, the processing unit and the output unit.
Input unit: Every information or data is fed into the computer via this unit ,with the help of a keyboard.
Now, the processing unit of a computer includes the Memory unit, the Control unit and the ALU unit..
Ans: A class is just a specification of the object.
The attributes and methods in a class are thus declarations that do not contain any values.
However, an object is a concrete instance of a class with properly defined values of each attributes and behaves as per the methods of the class.

How does a computer work for Class 9?