Singleton DP

• Creational Design Pattern
• Only one instance of the class should exist

Example : Eager Initialization

public class Singleton {

    private static Singleton instance = new Singleton();

    private Singleton() {
    }

    public static Singleton getObject() {
        return instance;
    }

}

Example : Lazy initialization

public class Singleton {

    private static Singleton instance = null;

    private Singleton() {}

    public static Singleton getObject(){ 
        if(instance == null) { 
            instance = new Singleton();  
        }  
        return instance;  
    } 

}