How to Create Custom Class in Java?

Last Updated : 20 Jul, 2021

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

Collections Class in Java

bhatiyaritu1122

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