Kitchen in House is Composition and Engine in Car is Aggregation Composition: If internal attributes can not exist without Outer Class, that goes to Composition. You can not take Bedroom, Kitchen or Balcony out of any Flat or House. i.e public class CompositionExample{ public static void main(String[] args) { House house = new House(); … More Composition vs Aggregation
So far in java we have seen interfaces and abstract classes, with a single abstract method, being used as function types. Their instances, known as function objects, represent functions or actions. Since JDK 1.1, the primary means of creating a function object was the anonymous class. Below is a code snippet to sort a list of strings in order … More Lambdas vs Anonymous Classes
The Java libraries include many resources that must be closed manually by invoking a close method. Examples include InputStream, OutputStream, and java.sql.Connection. While many of these resources use finalizers as a safety net, finalizers don’t work very well. For a long time, a try-finally statement was the best way to guarantee that a resource would be closed properly, even in the face … More Prefer try-with-resources to try-finally
Generally any class allows clients to create objects by providing a public constructor. There is another technique which every programmer should be aware of. An Static Factory. A class can provide one static factory, method which is simply an static method which returns object of the class. Note that a static factory method is not … More Static Factory vs Constructors
Terminologies are always an important part of understanding any design pattern. Below are some of the important terms that we come across on a daily basis if we are implementing our application in DDD way. You can read more about DDD in our previous articles here. Ubiquitous language: – In DDD world, Its a … More DDD Terminologies
this keyword is a pet name for the current instance within a class. In other word, this is a reference variable that refers to the current object. this does not really affect end code. It is a compile time operator and the code generated with or without it, will remain the same. Where you have to use it, that totally … More Use of ‘this’ in Java
