Learn Java – A Beginners Guide for 2024
Last Updated : 02 Jan, 2025
If you are new to the world of coding and want to start your coding journey with Java, then this learn Java a beginners guide gives you a complete overview of how to start Java programming. Java is among the most popular and widely used programming languages and platforms. A platform is an environment that helps to develop and run programs written in any programming language.
Learn Java
Java is fast, reliable, and secure. From desktop to web applications, scientific supercomputers to gaming consoles, cell phones to the Internet, Java is used in every nook and corner. Java is easy to learn and its syntax is simple and easy to understand. It is based on C++ (so easier for programmers who know C++). Java has removed many confusing and rarely-used features e.g. explicit pointers, operator overloading etc. Java also takes care of memory management and for that, it provides an automatic garbage collector. This collects the unused objects automatically.
Learn Java Step by Step
Roadmap to Learn Java Programming
If you’re embarking on your journey to become a skilled Java developer. Below is the complete guide as to how to get started with Java and make yourself proficient in it.
All About Java
Before taking your step, the most important thing to do is to get the answer of all WHYs. Here it refers to the questions like WHAT IS JAVA, WHY TO LEARN JAVA, WHY IT IS POPULAR, WHAT ARE ITS FEATURES etc. By digging into the mentioned article, you will not only learn the important things about Java but also you will understand how to start learning it.
Java Environment
To learn Java or any programming language, one first needs to know about its environment. Environment refers to the circumstances where a programming language works and how that program works. Java runs on a JVM environment. Click on the mentioned article to know more about JVM, its architecture and how it works.
- Learn about JVM here: JVM
Java Programming Basics
To become proficient in any programming language, one Firstly needs to understand the basics of that language. Therefore, this article will give you in-depth knowledge of the basics of Java in a very simple format.
Object Oriented Programming (OOPs) Concept in Java
Java is an object-oriented programming language. OOP makes the complete program simpler by dividing it into a number of objects. The objects can be used as a bridge to have data flow from one function to another. We can easily modify data and function as per the requirement. Hence learning about OOPs concepts makes a very important step in learning Java.
Classes and Objects in Java
Classes and Objects are basic concepts of Object Oriented Programming which revolve around the real-life entities and Java Programming. It means that to implement anything in Java, Classes and objects are made. This article will give you an insight about Classes and Objects and also help you relate it to the real world.
Constructors in Java
In Order to efficiently use Classes and Objects, one needs to know about the Constructors in Java. Constructors are used to initialize the object’s state. Like methods, a constructor also contains collection of statements(i.e. instructions) that are executed at time of Object creation.
Methods in Java
A method is a collection of statements that perform some specific task and return result to the caller. A method can perform some specific task without returning anything. Methods allow us to reuse the code without retyping the code. In Java, every method must be part of some class which is different from languages like C, C++ and Python. Methods are time savers and help us to reuse the code without retyping the code. This not only makes methods an important part of Java but also a must learn topic for learners.
Strings in Java
Strings are defined as an array of characters. Java, unlike other programming languages, provides a very easy implementation of Strings which can be learnt even by a beginner. Hover over this mentioned article to learn in depth about the Strings in Java.
Arrays in Java
An array is a group of like-typed variables that are referred to by a common name. Arrays in Java work differently than they do in C/C++. To know more, refer the mentioned article.
Collections in Java
A Collection is a group of individual objects represented as a single unit. Java provides Collection Framework which defines several classes and interfaces to represent a group of objects as a single unit. Java Collection Framework is not the most important part in learning Data Structures and Algorithms, but also it is the most useful module in a programming language
Generics in Java
Generics in Java is similar to templates in C++. The idea is to allow type (Integer, String, … etc and user-defined types) to be a parameter to methods, classes and interfaces. For example, classes like HashSet, ArrayList, HashMap, etc use generics very well. We can use them for any type. So not only Generics makes a very important asset in programming, but it also makes the backbone of writing efficient code as well.
Stream In Java
Introduced in Java 8, the Stream API is used to process collections of objects. A stream is a sequence of objects that support various methods which can be pipelined to produce the desired result. Though this was introduced later in Java, it has gained huge importance in the Java programming very quickly. To be able to work on data fluently in Java, one must learn about the Streams.
Exceptions and Exception Handling in Java
Many a times in the learning of Java till now, you must have come across the word “EXCEPTION”. An exception is an unwanted or unexpected event, which occurs during the execution of a program i.e at run time, that disrupts the normal flow of the program’s instructions. So to develop a module that does not break, one has to learn how to handle exceptions.
Regular Expressions (ReGex) in Java
Though this word might seem new to you, Regular Expression is a very important part of Development. Regular Expressions or Regex (in short) is an API for defining String patterns that can be used for searching, manipulating and editing text. It is widely used to define a constraint on strings such as a password.
Multithreading in Java
Multithreading is a Java feature that allows concurrent execution of two or more parts of a program for maximum utilization of CPU. Each part of such a program is called a thread. So, threads are light-weight processes within a process. Though this might seem difficult at first, its a very important part of concurrent programming in Java.
File Handling in Java
Java too supports file handling and allows users to handle files i.e., to read and write files, along with many other file handling options, to operate on files. The concept of file handling has stretched over various other languages, but the implementation is either complicated or lengthy, but alike other concepts of Java, this concept here is also easy and short.
Packages in Java
Package in Java is a mechanism to encapsulate a group of classes, sub packages and interfaces. In other words, a package in Java refers to a collection of classes, interfaces, abstract classes, and exceptions that will help in a module in Java programming.
Java Exercises – Basic to Advanced Java Practice
To learn java regular practice is very important. So, here in this section, we have listed a set of practice problems. In the practice problem section you will get a practice problem on every topics of Java like pattern programming, arrat, string and many others.
Conclusion
Mastering Java requires time, dedication, and practice. And this learn Java a beginners guide will provide you a well-rounded learning plan, exploring essential topics, and utilizing the best resources, so you can become a proficient Java developer. Remember that learning Java is a continuous process. Stay updated with the latest trends and engage with the community. With quality resources and consistent practice, you’ll be on your way to achieving your goals as a Java developer.
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