Problem Statement for Singleton Method

Use Case of Singleton Design Pattern: Database Connection Management

Consider a scenario where you need to manage a configuration object for an application, and you want to ensure that there is only one instance of this configuration object throughout the system.

Key Concepts of Singleton Method:

Private Constructor: The Singleton class has a private constructor to prevent the instantiation of the class from external entities.
Private Instance: The class contains a private static instance of itself.
Static Method: A static method is provided to access the instance, and it ensures that only one instance is created if it doesn’t exist.

Diagrammatic Representation of the above Problem:

Here, We are making SingleObject as an class, whereas SingleObject is behaving as like instance it will create private static instance, we will call the class in main and function we will create getInstance and showMessage, getInstance will return the object, showMessage will print the message.

Step by Step implementation of above problem:

Let’s implement a Singleton class step by step in Java.

Java

/*package whatever //do not write package name here */
 
import java.io.*;
 
public class Singleton {
    // Step 1: Private static instance
    private static Singleton instance;
 
    // Step 2: Private constructor
    private Singleton() {
        // Initialization, if needed
    }
 
    // Step 3: Static method to get the instance
    public static Singleton getInstance() {
        if (instance == null) {
            instance = new Singleton();
        }
        return instance;
    }
}

Use Case of Singleton:

Database Connection Management: Ensuring a single connection instance throughout the application.
Logger Classes: Managing a single logger instance to centralize log information.

Singleton Design Pattern in Java

Singleton Design Pattern is a creational design pattern that ensures a class has only one instance and provides a global point of access to it. This pattern is particularly useful when exactly one object is needed to coordinate actions across the system.

Important Topics for Singleton Method in Java

Problem Statement for Singleton Method:
Use Case of Singleton Design Pattern: Database Connection Management
Advantages of the Singleton Design Pattern:
Disadvantages of the Singleton Design Pattern:
Conclusion:

Tags:

#Geeks Premier League 2023 #Java-Design-Patterns #Design Pattern #Geeks Premier League #System Design