OBJECT ORIENTED PROGRAMMING WITH JAVA

 CHAPTER 4

 What is a class?

Ans) A class is a blue print or poto type from which objects are created .class define entities that usually represent real world objects.

Pen,chair,college and student realworld entities that are represented by class.

A class has class signature ,optional constructors data memberand methods.

[java modifier] class class name {

//data members

//constructors

//methods

}

Class student{

int rollno;                                                     data member

String name;

String technology;

}

                   Public static void[show data()]{

System.out.println(“roll no=”+roll no);

System.out.println(”name=”name);

System.out.println(“technology=”+technology)

}

}

What is object?

Ans) An object instance of a class.

Student S1=new student();

S1.roll no=”11”;

S1.name=”ALI”;

S1.tech=”I.T”;

S1.show data=();