Single level inheritance in Java language
In this tutorial, we will discuss the concept of single-level inheritance in Java language
Single level inheritance is one of the techniques in Java. It is easy to understand, a class acquires the properties of (data members and methods) another class. The diagram below indicates that class B extends only from class A. Here, A is the parent class of B, therefore, B is the child class of A.
Single inheritance
Syntex
class Super{
…………
…………
}
class Sub extends Super{
…………
…………
}
Example
program 1
class Base
{
void displayb()
{
System.out.println(“thnis is Base class display”);
}
}
class drived extends Base
{
void displayc()
{
System.out.println(“thnis is drived class display”);
}
public static void main(String args[]){
drived d=new drived();
d.displayb();
d.displayc();
}
}
Program2
class Base1
{
void displayb()
{
System.out.println(“thnis is Base class display”);
}
}
class drived extends Base
{
void displayc()
{
System.out.println(“thnis is drived class display”);
}
}
class simpleinherit{
public static void main(String args[]){
drived d=new drived();
d.displayb();
d.displayc();
}
}
Program 3
class teacher{ //class teacher
float salary=40000;
}
//………………….
class principal extends teacher{ // class principal
float bonus=10000;
public static void main (String args[]){ //main method
principal p=new principal(); //create object
System.out.println(“teacher salary is:”+p.salary);
//access variable of teacher class from this class
System.out.println(“principal bonus is:”+p.bonus);
//access variable of this class
}
}
class maths2
{
int a; // global variable
public void add(int x, int y){ // create method add
//parameter passing to method add as int a, int b
a=x+y;
System.out.println(“The sum of the x,y:”+a);
}
public void sub(int x, int y){//create method sub
//parameter passing to method sub as int a, int b
a=x-y;
System.out.println(“The different of the x,y:”+a);
}
}
public class calc extends maths2{
public void mul(int x, int y){
a=x*y;
System.out.println(“The multiplication of the x,y:”+a);
}
public static void main (String args[])//main method
{
calc demo=new calc(); //create object
demo.add(34,56); // argument passing
demo.sub(78,54);
demo.mul(78,79);
}
