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Composition Java Example: Java Explained

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Java is a powerful, general-purpose programming language that is used in a variety of applications. This article will explain what Java is and how it works, followed by a comprehensive look at composition and its usage in Java. We will also discuss the benefits, setting up the environment, syntax, and OOPs, before laying out a practical example.

What is Java and How Does it Work?

Java is an object-oriented, class-based programming language developed by Sun Microsystems in the early 1990s. It is a high-level language and Java applications are compiled into bytecode, which can then be run on any platform that supports the Java Runtime Environment (JRE).

Java was designed to be easy to use, write, compile and debug, with uses ranging from website development, mobile apps and enterprise software development. It has been the language of choice for many, from beginners to experienced developers because of its power, scalability and platform independence. It is one of the most popular languages and has been used to develop everything from embedded systems like ATMs and smart cards to large-scale enterprise applications like banking software.

Benefits of Using Java

The main advantages of using Java include its platform-independence, high performance, dynamic capability, scalability and its use of object-oriented programming (OOP) design. Java can be used on any platform and its code can be used across platforms without needing to be recompiled. Additionally, it is faster than many other languages because of its use of bytecode which is faster than machine code.

It also allows for easier programming with dynamic typing and garbage collection; it enables developers to create programs more quickly by eliminating the need for manual memory management. Additionally, Java has excellent support for OOP principles, making it easy to create reliable programs with less code.

Setting Up Your Java Environment

In order to begin programming in Java, you will first need to download and install the Java Development Kit (JDK). The JDK includes a set of necessary tools for compiling and executing code written in the Java language. After it is installed, you can begin programming with the Java language.

You will also need to set up your development environment. This is the environment that your code will compile and run within. Once you have set up your development environment you can begin coding in your chosen editor or IDE. It is important that you select an editor or IDE that is optimized for developing in Java as this will make programming much easier.

Understanding Java Syntax and Constructs

Once you have installed the JDK and selected your editor/IDE, you are ready to begin coding. Before you start writing code you need to have a good understanding of the language’s syntax and constructs. Java has a simple syntax that is easy to learn. There are also advanced concepts like generic types, annotations and autoboxing that can be used to make your code more robust.

It is important to note that the way code is structured affects how it runs. In order to write high-quality code that produces the desired results, it is important to understand how the language works and how these structures are used.

Introduction to Object-Oriented Programming with Java

Object-oriented programming (OOP) is an important design paradigm used in modern software development. It is based on the idea that all software elements should have behaviors associated with them, which can be expressed in terms of methods or operations. Objects can also have properties or data associated with them.

In addition to allowing for more modular programming designs, OOP features such as inheritance and polymorphism allow for code reusability which results in more efficient development cycles. Java supports OOP principles in its design and emphasized them in newer versions such as Java 8, making it an ideal language for developing robust applications.

Writing Your First Java Program

Now that you have a basic understanding of the syntax, you can begin writing code using a simple Java program. The program should begin with the obligatory ‘Hello World!’ statement which is made using one system output statement – System.out.println(“Hello World!”).

From here you can move onto writing basic programs such as programs that accept user names and print them back out after being manipulated in some way or loop through print statements according to a certain criteria. As you progress with coding in Java you will understand more complex concepts such as classes, interfaces and threading.

Working with Variables, Primitives, and Operators

Before you begin writing a more complex program you need to understand the concept of variables. Variables are used to store data and manipulate this data during execution. Primitives are types assigned to these variables such as integers for numbers and strings for text values. There are also operators which define where in memory the data should go either at compile time (declaring) or runtime (assigning).

Java also has “operators” which define a certain task or function: arithmetic operators (addition or division) or logical operators (AND or NOT). These are vital to understand if you want to perform common operations on data such as calculating an average or finding an item in a list.

Working with Control Statements and Loops

Control statements allow you to control the flow of execution of your program. If statements are used to determine if a certain part of the program should be executed or not. Loops are used to repeatedly execute certain parts of your code until a certain condition is met.

In both cases, you need to ensure that your conditions are well defined so that your program does not continue looping indefinitely or skip a part of logic that should have been executed. Additionally, operations like break can be used to break out of a loop prematurely so that additional operations can be run.

Composition in Java: Understanding the Basics

Composition refers to an object-oriented concept wherein an object consists of components as opposed to inheriting features from a single parent object. This allows for greater flexibility in allowing objects to have different properties and behaviors. These properties and behaviors can be connected in various combinations, allowing for greater levels of customization.

In Java, composition is done by combining classes with other classes or interfaces. This allows objects to act as components that interact to produce a desired result. It also allows for dynamic relationships between objects which would not be possible through traditional inheritance. Composition Example in Java would look like this:

Class A {     // Class A components } Class B {     // Class B components } Class C {     A objA;     B objB;     C(){         objA = new A();         objB = new B();     }    // other methods ... } 

In this example Class C has instances of both Classes A and B as components, without inheriting any of their features or behavior. These components can interact with each other through access provided by Class Cs methods.

Implementing Composition in a Simple Java Program

Let’s consider a simple example in Java where we implement composition for an application that prints information about a user when given their name and age. To do this we will first create two classes – User and Printer – and initialize them in our main class Program.

public class User {     private String name;     private int age;     public User(String name, int age){ = name;         this.age = age;     }     public String getName() {         return name;     }     public void setName(String name) { = name;     }     public int getAge() {         return age;     }     public void setAge(int age) {         this.age = age;     }  } 
public class Printer {      public void printUserData(User user){         System.out.println("Name: " + user.getName() + ", Age: " +  user.getAge());      } } 
public class Program {     public static void main(String[] args) {         User user = new User("John", 30);          Printer printer = new Printer();          printer.printUserData(user);       }  } 

In this case we have created two classes: User to store a user’s data and Printer to print that data out. The Program class initializes both the User object with John’s data as well as our Printer object. The Printer object then uses the User object’s getter methods to get the data off the User object and print it out using its own printUserData method.

Advantages of Composition Over Inheritance

Composition has many advantages over inheritance because it allows you to create relationships between objects that would otherwise not be possible. Through composition you can design classes with levels of abstraction that are not visible when using inheritance alone.

Composition also allows objects to share certain behaviors while still being able to have different properties from each other. Additionally, since composition relies on references between objects rather than inheritance, it is much more stable since objects don’t need to conform to each other’s features.

Best Practices for Utilizing Composition in Your Code

When coding with composition it is important to remember the following best practices:

  • Use composition sparingly since it can quickly become complex;
  • Always make sure classes are loosely coupled so that changes in one object do not affect other objects;
  • Be aware of any circular references that might occur;
  • Make sure composition is used when appropriate with regard to complexity;
  • Favor composition over inheritance in situations where inheritance would cause too much coupling.


Composition is an extremely powerful tool when used correctly in designing modern applications. Understanding how it works is key to unlocking its full potential and creating robust applications with fewer lines of code than traditionally possible through inheritance alone.

Anand Das

Anand Das

Anand is Co-founder and CTO of Bito. He leads technical strategy and engineering, and is our biggest user! Formerly, Anand was CTO of Eyeota, a data company acquired by Dun & Bradstreet. He is co-founder of PubMatic, where he led the building of an ad exchange system that handles over 1 Trillion bids per day.

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