Builder pattern solves the issue with a large number of optional parameters and inconsistent state by providing a way to build the object step-by-step and provide a method that will actually return the final Object. This pattern was introduced to solve some of the problems with Factory and Abstract Factory design patterns when the Object contains a lot of attributes.
Bluej example how to#
Check out Abstract Factory Pattern to know how to implement this pattern with example program. In Abstract Factory pattern, we get rid of if-else block and have a factory class for each sub-class and then an Abstract Factory class that will return the sub-class based on the input factory class. If you are familiar with the factory design pattern in java, you will notice that we have a single Factory class that returns the different sub-classes based on the input provided and the factory class uses if-else or switch statements to achieve this. This is one of the most widely used java design patterns.Ībstract Factory pattern is similar to Factory pattern and it’s a factory of factories. Check out Factory Design Pattern for example program and factory pattern benefits. We can apply a Singleton pattern on the Factory class or make the factory method static. This pattern takes out the responsibility of the instantiation of a class from the client program to the factory class. The factory design pattern is used when we have a superclass with multiple sub-classes and based on input, we need to return one of the sub-class. This is one of the most discussed java design patterns. Check out Singleton Design Pattern to learn about different ways to implement Singleton pattern and pros and cons of each of the method. The implementation of the Singleton pattern has always been a controversial topic among developers. It seems to be a very simple design pattern but when it comes to implementation, it comes with a lot of implementation concerns. Singleton pattern restricts the instantiation of a class and ensures that only one instance of the class exists in the Java virtual machine. Creational design patterns provide solution to instantiate a object in the best possible way for specific situations.
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