Java Programming Practical 8
Question 1
Write a program to implement single inheritance
SingleInheritanceDemo.java
Java
class Person
{
String name;
public void get(String n)
{
name=n;
}
public void show()
{
System.out.println("Name is: " +name);
}
}
class Student extends Person
{
int rollno;
public void accept(int r)
{
rollno=r;
}
public void display()
{
System.out.println("Roll no is: " +rollno);
}
}
public class SingleInheritanceDemo
{
public static void main(String[] args)
{
Student s = new Student();
s.get("Suresh");
s.accept(47);
s.show();
s.display();
}
}
Output
Question 2
Write a program to implement multilevel inheritance.
MultilevelInheritanceDemo.java
Java
class Person
{
String name;
void getPerson(String n)
{
name=n;
}
void displayPerson()
{
System.out.println("Name is: "+name);
}
}
class Employee extends Person
{
int id;
void getEmp(int i)
{
id=i;
}
void displayEmployee()
{
System.out.println("ID no. is: "+id);
}
}
class Programmer extends Employee
{
String skill;
void getProgrammer(String s)
{
skill=s;
}
void displayProgrammer()
{
System.out.println("Skill language is: "+skill);
}
}
public class MultilevelInheritanceDemo
{
public static void main(String[] args)
{
Programmer obj = new Programmer();
obj.getPerson("ABC");
obj.getEmp(4545);
obj.getProgrammer("Java");
obj.displayPerson();
obj.displayEmployee();
obj.displayProgrammer();
}
}
Output
Question 3
Develop a program to calculate he room area and volume to illustrate the concept of single inheritance.
RoomDemo.java
Java
class Room
{
int length, width;
Room(int l, int w)
{
length = l;
width = w;
}
void calculateArea()
{
int a=length * width;
System.out.println("Room Area: " + a + " square units");
}
}
class RoomVolume extends Room
{
int height;
RoomVolume(int l, int w, int h)
{
super(l, w);
height = h;
}
void calculateVolume()
{
int v=length*width*height;
System.out.println("Room Volume: " + v + " cubic units");
}
}
public class RoomDemo
{
public static void main(String[] args)
{
RoomVolume myRoom = new RoomVolume(10, 12, 8);
myRoom.calculateArea();
myRoom.calculateVolume();
}
}
Output
