Example of Java Singleton class

Java Singleton design pattern is one of the design pattern that governs the instantiation of an object in Java. This design pattern suggest that only one instance of a Singleton object is created by the JVM. This pattern is useful when exactly one object is needed to coordinate actions across the system

public class SimpleSingleton {
    private static SimpleSingleton singleInstance =  new SimpleSingleton();
 
    //Marking default constructor private
    //to avoid direct instantiation.
    private SimpleSingleton() {
    }
 
    //Get instance for class SimpleSingleton
    public static SimpleSingleton getInstance() {
 
        return singleInstance;
    }
}