Declare a private static instance of the class
Make the constructor private
Provide a public static method to return the instance
Initialize the instance eagerly or lazily
Use synchronization if lazy initialization must be thread-safe
Use double-checked locking with `volatile` for better performance
Use an enum singleton for the simplest thread-safe approach
`public class Singleton {`
` private static Singleton instance;`
` private Singleton() {}`
` public static Singleton getInstance() {`
` if (instance == null) {`
` instance = new Singleton();`
` }`
` return instance;`
` }`
`}`