real world example of singleton class in java

Interactive Object-Oriented Programming in Java (Apress 2016) Figure 1-1 shows the class diagram for the illustration of the Singleton pattern.

The logging class. Managing a connection to a database. File manager. Real world examples of singleton java.lang.Runtime#getRuntime() java.awt.

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Known Uses: Examples of the pattern found in real systems. We include at least two examples from different domains. Related Patterns: What design patterns are 

Classes: Notion of the design pattern. Classification of the design patterns. Patterns: Singleton Factory Method

(OMG) Data Distribution Service for Real-Time Systems (DDS). simply requires to construct an object by instantiating a template class with the.

The Singleton Pattern lIntent ØEnsure a class only has one instance and provide a global point of access to it lMotivation ØSometimes we want just a single instance of a class to exist in the system ØFor example we want just one window manager Or just one factory for a family of products

Singleton Pattern: Structure static getInstance() : Singleton private Singleton() static my_instance : Singleton Singleton Singleton involves only a single class (not typically called Singleton) That class is a full-?edged class with other attributes and methods (not shown) The class has a static variable that points at a single instance of

Recall the second weakness of Java constructors Java constructors always return a new object never a pre-existing object • Singleton : only one object exists at runtime –Factory method returns the same object every time • Interning : only one object with a particular (abstract) value exists at runtime

Singleton Pattern with Single-Threaded EnvironmentFor single-threaded applications we will have to do:Create a private static instance of the Singleton class Keep the constructor private Create a private static getInstance() method to return the same object always public class Singleton { /* private instance variable */ private static

In this example making the class final prevents cloning Since Singleton is inherited directly from Object the clone( ) method remains protected so it cannot be used (doing so produces a compile-time error) However if you’re inheriting from a class hierarchy that has already overridden clone( ) as

Singleton Class in Java could be realized in one of the four following ways : 1 Early Loading 2 Lazy Loading 3 Lazy Loading – Thread Safe 4 Enum type Singleton Class in Java using Early Loading The instance could be initialized directly during the instance declaration JVM Java Virtual Machine takes care of creation of instance of the