package inht;
public class inheritaance
{
public static void main(String[] args)
{
Add obj = new Add();
obj.num1=5;
obj.num2=4;
obj.sum();
System.out.println(obj.result);
}
}
class Add{
int num1,num2,result;
public void sum()
{
result = num1+num2;
}
}
Output:-
package inht;
public class inheritt
{
public static void main(String[] args)
{
AddSub obj = new AddSub();
obj.num1=5;
obj.num2=4;
obj.sum();
System.out.println(obj.result);
obj.sub();
System.out.println(obj.result);
}
}
class Y{
int num1,num2,result;
public void sum()
{
result = num1+num2;
}
}
class AddSub extends Y{
public void sub()
{
result = num1-num2;
}
}
Output:-
public class inheritaance
{
public static void main(String[] args)
{
Add obj = new Add();
obj.num1=5;
obj.num2=4;
obj.sum();
System.out.println(obj.result);
}
}
class Add{
int num1,num2,result;
public void sum()
{
result = num1+num2;
}
}
Output:-
public class inheritt
{
public static void main(String[] args)
{
AddSub obj = new AddSub();
obj.num1=5;
obj.num2=4;
obj.sum();
System.out.println(obj.result);
obj.sub();
System.out.println(obj.result);
}
}
class Y{
int num1,num2,result;
public void sum()
{
result = num1+num2;
}
}
class AddSub extends Y{
public void sub()
{
result = num1-num2;
}
}
PolyMorPhism
MethodOverloading- In a Class , Same name of methods but with different type or number of parameters.
package inht;
public class Polymory{
public static void main(String[] args){
A obj = new A();
obj.show(5.5);
}
}
class A{
public void show(){
System.out.println("Hello");
}
public void show (int i){
System.out.println("Hello"+i);
}
public void show (double d){
System.out.println("Hello"+d);
}
} Output:-
Polymorphism
MethodOverloading
package inht;
public class Polymory{
public static void main(String[] args){
B obj = new B();
obj.show();
}
}
class A{
public void show(){
System.out.println("Showing A");
}
}
class B extends A{
}
https://www.youtube.com/watch?v=-Alpmo-OfJs&index=71&list=PLsyeobzWxl7oZ-fxDYkOToURHhMuWD1BK
https://www.youtube.com/watch?v=RcIsb9iFKH8&index=86&list=PLsyeobzWxl7oZ-fxDYkOToURHhMuWD1BK
We will Create Two Classes here by Name Employee and EmployeeTest
Make another class by Employee:-
package Empl;
public class Employee{
String name;
int age;
String designation;
double salary;
// This is the constructor of the class Employee
public Employee(String name){
this.name = name;
}
// Assign the age of the Employee to the variable age.
public void empAge(int empAge){
age = empAge;
}
/* Assign the designation to the variable designation.*/
public void empDesignation(String empDesig){
designation = empDesig;
}
/* Assign the salary to the variable salary.*/
public void empSalary(double empSalary){
salary = empSalary;
}
/* Print the Employee details */
public void printEmployee(){
System.out.println("Name:"+ name );
System.out.println("Age:" + age );
System.out.println("Designation:" + designation );
System.out.println("Salary:" + salary);
}
}
Make another Class by name EmployeeTest:-
package Empl;
import java.io.*;
public class EmployeeTest{
public static void main(String args[]){
/* Create two objects using constructor */
Employee empOne = new Employee("James Smith");
Employee empTwo = new Employee("Mary Anne");
// Invoking methods for each object created
empOne.empAge(26);
empOne.empDesignation("Senior Software Engineer");
empOne.empSalary(1000);
empOne.printEmployee();
empTwo.empAge(21);
empTwo.empDesignation("Software Engineer");
empTwo.empSalary(500);
empTwo.printEmployee();
}
}
Output:-
Encapsulation
package Empl;
public class Encapsul{
public static void main (String[] args)
{
Emp e1= new Emp();
e1.setEmpId(3);
e1.setEmpName("SystemWebTech");
//Emp e2= new Emp();
//e2.empId=4;
//e2.empName="SystemWebTechOnline";
System.out.println(e1.getEmpName());
}
}
class Emp
{
private int empId;
private String empName;
public int getEmpId() {
return empId;
}
public void setEmpId(int empId) {
this.empId = empId;
}
public String getEmpName() {
return empName;
}
public void setEmpName(String empName) {
this.empName = empName;
}
}
'
Output:-
