Class is the collection of objects. Class is not a real-world entity it is just only templates and prototypes or blueprints. Class does not occupy memory. We can write a custom class as per our choice for an illustration purpose a sample is shown in the program below as a helper class.
Example:
Java
// Java Program to Creating our Own Custom Class // Importing input output classes import java.io.*;
// Class 1 // Helper class class Employee {
// Member variables of this class
// first attribute
int id;
// second attribute
int salary;
// third attribute
String name;
// Member function of this class
// Method 1
public void printDetails()
{
// Print and display commands
System.out.println( "My id is " + id);
System.out.println( "This is my name " + name);
}
// Method 2
public int getSalary()
{
// Simply returning the salary
return salary;
}
} // Class 2 // Main class class Custom {
// Main driver method
public static void main(String[] args)
{
// Display message only
System.out.println( "This is the custom class" );
// Creating object of custom class in the main()
// method Instantiating a new Employee object
Employee harry = new Employee();
// Again creating object of custom class and
// instantiating a new Employee object
Employee robin = new Employee();
// Initializing values for first object created
// above
harry.id = 23 ;
harry.salary = 100000 ;
harry.name = "Ritu bhatiya" ;
// Initializing values for second object created
// above
robin.id = 25 ;
robin.salary = 150000 ;
robin.name = "Amit thripathi" ;
// Printing object attributes by
// calling the method as defined in our class
harry.printDetails();
robin.printDetails();
// Calling the method again of our class and
// storing it in a variable
int salary = robin.getSalary();
// Print and display the above salary
System.out.println( "Salary of robin : " + salary
+ "$" );
System.out.println( "ID : " + harry.id);
}
} |
Output
This is the custom class My id is 23 This is my name Ritu bhatiya My id is 25 This is my name Amit thripathi Salary of robin : 150000$ ID : 23