Design Patterns

Decorator design pattern is used to modify the functionality of an object at runtime. At the same time other instances of the same class will not be affected by this, so individual object gets the modified behavior. Decorator design pattern is one of the structural design pattern (such as [Adapter Pattern](/community/tutorials/adapter-design-pattern-java "Adapter Design Pattern in […]

Singleton is one of the most widely used creational design pattern to restrict the object creation by applications. In real world applications, resources like Database connections or Enterprise Information Systems (EIS) are limited and should be used wisely to avoid any resource crunch. To achieve this, we can implement Singleton design pattern to create a wrapper class around the resource and limit the number of object created at runtime to one.

Chain of responsibility design pattern is one of the behavioral design pattern. Chain of Responsibility Design Pattern  Chain of responsibility pattern is used to achieve loose coupling in software design where a request from client is passed to […]

URL: https://www.progressiverobot.com/iterator-design-pattern-java/ Iterator design pattern in one of the behavioral pattern. Iterator pattern is used to provide a standard way to traverse through a group of Objects. Iterator pattern is widely used in [Java Collection Framework](/community/tutorials/collections-in-java-tutorial "Java Collections Framework Tutorial"). Iterator interface provides methods for traversing through a collection. Iterator Design Pattern  […]

Learn the Gang of Four design patterns and understand how GoF patterns improve software design using best practices.

Adapter design pattern is one of the structural design pattern and its used so that two unrelated interfaces can work together. The object that joins these unrelated interface is called an Adapter. Adapter Design Pattern  One of the great real life […]

URL: https://www.progressiverobot.com/java-dependency-injection-design-pattern-example-tutorial/ Java Dependency Injection design pattern allows us to remove the hard-coded dependencies and make our application loosely coupled, extendable and maintainable. We can implement dependency injection in java to move the dependency resolution from compile-time to runtime. Java Dependency Injection Java Dependency injection seems hard to grasp with theory, so we would take […]

URL: https://www.progressiverobot.com/observer-design-pattern-in-java/ Observer Pattern is one of the behavioral design pattern. Observer design pattern is useful when you are interested in the state of an object and want to get notified whenever there is any change. In observer pattern, the object that watch on the state of another object are called Observer and the object […]

URL: https://www.progressiverobot.com/mediator-design-pattern-java/ Mediator design pattern is one of the behavioral design pattern, so it deals with the behaviors of objects. Mediator design pattern is used to provide a centralized communication medium between different objects in a system. Mediator Design Pattern  According to GoF, mediator pattern intent is: […]

Welcome to Abstract Factory Design Pattern in java example. Abstract Factory design pattern is one of the Creational patterns. Abstract Factory pattern is almost similar to [Factory Pattern](/community/tutorials/factory-design-pattern-in-java) except the fact that its more like factory of factories. Abstract Factory  If you are familiar with [factory […]