Have you noticed the concept of instantiation in the SingletonClassExample class? On the other hand, to create an instance of a singleton class, we use getInstance() method. Wikipedia has a great explanation of double-checked locking along with Java code. Following is a picture that depicts the structure of Singleton Class : Singleton Class in Java could be realized in one of the four following ways : The instance could be initialized directly during the instance declaration. Developed by JavaTpoint. How do you ensure that a class has only one instance? In this Singleton class, first of all notice that I’ve created an private and static instance of Singleton class. // the method which gives access to the only instance of SingletonCls, is thread safe, * Singleton Design implementation using enum, // the variable INSTANCE shall be compiled to a public static final field of type SingletonEnumEx, Java - Read File contents line by line using Stream, Java - Read File contents line by line using BufferedReader, Java ArrayList - Insert Element at Specific Position, Java JDBC - List all databases in MySQL Server. That’s because they represent something unique, something that’s one of its kind.

Thus, using this behavior, Singleton Class could be achieved using enum as shown in the following example.

In this approach, a static inner class is used to lazily create a singleton instance. Just like the previous solution, the instance is created whether or not it is needed by the application.

Provide global access to that instance by: Declaring all constructors of the class to be private. Let's create the main class with the name Test. 9 mins read.

Mail us on hr@javatpoint.com, to get more information about given services. It is a creational design pattern wherein we deal with the creation of objects. Singleton Class in Java using Lazy Loading that is thread safe: The instance could be initialized only when the Singleton Class is used for the first time. It ensures that only one connection is made and a thread can access the connection at a time. You can also create the one-off instance of the class in a static block.

Another point to be noted that if we perform any modification to the object (such as variables) a, it also reflects the objects b and c. On the other hand, if we change the variable of object c, it also reflects changes in other objects. Private constructors and factory methods are also an example of the singleton class. The synchronized keyword ensures that only one thread can execute the getInstance() method at a time. java.awt.Desktop: The Desktop class allows Java applications to launch a URI or a file with the applications that are registered on the native Desktop like the user’s default browser, or mail client. It is a creational design pattern wherein we deal with the creation of objects. Singleton pattern is one of the simplest design patterns in Java.

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