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 ClassÂ
// Importing input output classesimport java.io.*;Â
// Class 1// Helper classclass Employee {Â
    // Member variables of this classÂ
    // first attribute    int id;    // second attribute    int salary;    // third attribute    String name;Â
    // Member function of this classÂ
    // Method 1    public void printDetails()    {        // Print and display commands        System.out.println("My id is " + id);        System.out.println("This is my name " + name);    }Â
    // Method 2    public int getSalary()    {Â
        // Simply returning the salary        return salary;    }}Â
// Class 2// Main classclass Custom {Â
    // Main driver method    public static void main(String[] args)    {Â
        // Display message only        System.out.println("This is the custom class");Â
        // Creating object of custom class in the main()        // method Instantiating a new Employee object        Employee harry = new Employee();Â
        // Again creating object of custom class and        // instantiating a new Employee object        Employee robin = new Employee();Â
        // Initializing values for first object created        // above        harry.id = 23;        harry.salary = 100000;        harry.name = "Ritu bhatiya";Â
        // Initializing values for second object created        // above        robin.id = 25;        robin.salary = 150000;        robin.name = "Amit thripathi";Â
        // Printing object attributes by        // calling the method as defined in our class        harry.printDetails();        robin.printDetails();Â
        // Calling the method again of our class and        // storing it in a variable        int salary = robin.getSalary();Â
        // Print and display the above salary        System.out.println("Salary of robin : " + salary                           + "$");Â
        System.out.println("ID : " + harry.id);    }} |
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Output
This is the custom class My id is 23 This is my name Ritu bhatiya My id is 25 This is my name Amit thripathi Salary of robin : 150000$ ID : 23
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