public class DemoSingleton implements Serializable { private static final long serialVersionUID = 1L; private DemoSingleton() { // private constructor } private static class DemoSingletonHolder { public static final DemoSingleton INSTANCE = new DemoSingleton(); } public static DemoSingleton getInstance(...
package com.howtodoinjava.demo; import java.util.HashMap; import java.util.Map; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.Bean; import org.springframework.core.Ordered; import org.s...
How to Implement Bubble Sort Algorithm in Java – Ascending and Descending Order Example In Java how to join Arrays? 3 ways: Apache Commons ArrayUtils, Java 8 Streams and Simple APIs Complete End to End Java Tutorial with Singleton Object Employee, Crunchify Java POJO and Detailed TestCaseJava...
Hello everyone, today, we will learn an important design pattern which is often overlooked by Java developers. Yes, I am talking aboutthe Command patternwhich helps us write flexible and loosely coupled code to implement actions and events in our application. In short, the Command design pattern...
Implement Lazy Initialization in Java A getter method checks whether a private member has some value already. If it has, the function returns it; else, it creates a new instance and returns it for the first time execution. There are two methods to do lazy initialization. ...
How to implement the Adapter design pattern in Java? There are two ways to implement the adapter design pattern in Java, one using inheritance, also known as the class adapter pattern, and the other using composition, also known as the object adapter pattern. In both cases, it is best to...
High performance scalable web applications often use a distributed in-memory data cache in front of or in place of robust persistent storage for some tasks. In Java Applications it is very common to use in Memory Cache for better performance. But what is “Cache?” A cache is an area of ...
Using the Inheritance Concept of Java Using the Getters and Setters of Another Class Using the Singleton Pattern Design for Declaring Global Variables Conclusion In this article, you will learn about accessing a variable from another class in a Java Program. To be able to program in any programm...
How to implement reverse-lookup in enum? What is EnumMap and EnumSet? 1.12.Java Serialization and Serializable Interface Suppose you are preparing for a Java interview with a Telecom company or any such domain that uses serialization in their application flows. In that case, you will highly bene...
// perform a lookup by class alone. We must first map the class to its // service name then invoke the string-based method. String serviceName = getSystemServiceName(serviceClass); return serviceName != null ? (T)getSystemService(serviceName) : null; ...