Mastering Singleton Design Pattern in Java: A Comprehensive Guide
Singleton Pattern says that just "define a class that has only one instance and provides a global point of access to it". In other words, a class must ensure that only single instance should be created and single object can be used by all other classes. There are two forms of singleton design pattern Early Instantiation: Early instantiation in the Singleton design pattern refers to the approach where the single instance of the class is created eagerly, i.e., as soon as the class is loaded by the Java Virtual Machine (JVM) or at the time of class loading. This means that the intance is created regardless of whether it is immediately needed or not. Early Instantiation Example Early Instantiation in this example: The instance variable is declared as private and final, making it a constant, ensuring that can be assigned only once. The constructor of the class is made private to prevent external instantiation. The instance is created and assigned at the time of clas...