Let me give you a Java Introduction. Java is everybody’s favourite programming language worldwide due to its unique features and capabilities.
Java introduction covers everything you need to start with the Java language and install Java compilers on computers. In this article, let us get a Java introduction and learn about Java programming.
Java Introduction: How To Start With Java Programming?
If you are a beginner and new to Java programming language then for Java language you might require the following tools and techniques available.
- A text editor to write and edit Java programming
- A compiler to translate the C++ code into machine-understandable format.
- Ensure the availability of JDK (Java Development Kit) and Java Virtual Machine (JVM)
- Basic knowledge of Java Syntaxes
- Java introduction with fundamentals of Java programming language.
How To Install Java IDE?
You can install a Java IDE directly from the official website for free. In this Java introduction, you will learn how to install the Java IDE and start writing and executing Java code. Some of the popular Java IDEs are Visual Studio Code, Eclipse, Atom, Code:: Blocks, etc. Check the following steps to download the Java IDE on your computer.
Note: We will learn to download the Visual Studio Code IDE on our personal device.
- First, go to the official website of Visual Studio Code or you can directly search for “Visual Studio Code download”.
- Remember the Visual Studio Code is the same for every programming language and there is no separate IDE for C++ and Java in Visual Studio Code.
- You can directly select the download option and a page will appear with options to download Visual Studio Code for different devices.
- Select one of the options based on the device you have such as macOS, Windows, or Linux devices.
- Click on the Download Button highlighted in blue after selecting your device type.
- You can check your device specifications from the Settings options on your computer.
- Open the Visual Studio IDE after downloading and installation complete.
- Now you can set up the IDE with extensions, plugins, and other features available on Visual Studio Code.
- Start your coding journey!
Java Introduction: First Hello World! Program In Java
Let us write and execute our first “Hello World!” program with Java programming language. Create a new file on Visual Studio Code with File -> New File. You can also open an existing file to write your First program in Java.
Choose a name for your first Java programming such as “myfirstJava.java” and save the file.
| public class HelloWorld {
public static void main(String[] args) { System.out.println(“Hello, World!”); } } |
Output
This simple Java program code will print “Hello, World!” on your screen. You can compile and run the program using “Ctrl + F5” on Visual Studio Code.
The Visual Studio Code will look like the image given below. Click on the Run button to execute the Java program. If you do not understand the above code, worry not! You can learn how to write, edit, and execute Java programs with our Java tutorials and Decode Java with DSA Course on the PW Skills platform.
How To Use Online Compilers At PW Skills?
There are many online compilers available for writing Java programs and executing them online without downloading them on the device. Get complete access to PW Skills Lab when you enroll in the PW Skills Decode DSA with Java Course.
Meanwhile, you can also use other online compilers such as GDB Compiler, Programiz, Google Collab, etc.
- Go to the Online GDB compiler website and click on the official website link.
- The homepage will look like this below, ready for execution of a Java program.
- Select the programming language i,e. Java and start editing your program and when complete click on the “run” button on the top of the taskbar on the GDB compiler.
- The Java introduction program for Hello World will execute in the terminal given below in the GDB compiler.
Java Is Built Different From C++ Or Python
In the Java introduction you will know that the Java programming language is different from other popular programming languages. Let us know some of the major features of Java which sets it apart from other programming languages.
Platform Independent
Java programming is platform-independent and Java code once written can run anywhere with the help of the Java Virtual Machine (JVM). Unlike other programming languages, which need to be written and edited a number of times on different devices.
Object Oriented Programming
Java is a fully object oriented programming language and strictly uses OOP principles. While C++ supports both procedural and object-oriented programming. And Python uses Procedural code for flexibility.
Automatic Memory Management
Java supports automatic garbage collection which handles memory cleaning and reduces memory leaks in Java programs. While C++ offers manual memory management using pointers. Python offers automatic memory management but is less reliable and effective than Java, especially for large scale applications.
Multithreading
This feature of Java programming offers built in support for multithreading and concurrency through classes like threads. C++ does not have built-in support for multi-threading and Python has less efficient multithreading, which requires a Global interpreter to execute.
Security & Performances
Java offers a more secure environment and prevents unauthorized access with built in security features in JVM. Also, Java programs are faster and more reliable than other programming languages like C++ and Python.
These are some of the reasons that make Java programming language the most preferred programming language for programmers and developers worldwide.
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Java Introduction FAQ
Q1. What is Java Introduction?
Ans: Java is a high-level, object-oriented programming language developed by Sun Microsystems (now owned by Oracle) in 1995. It is widely known for its “Write Once, Run Anywhere” capability, meaning Java programs can run on any device equipped with a Java Virtual Machine (JVM).
Q2. What are the key features of Java?
Java stands out for its simplicity, portability, and security. It is fully object-oriented, meaning all code is written inside classes and utilizes objects for functionality.
Q3. How is Java different from other programming languages like C++ or Python?
Java differs significantly from other languages like C++ and Python.
1. Unlike C++, Java does not allow direct memory manipulation using pointers, making it safer and less prone to memory-related errors.
2. While Python is often praised for its simplicity and readability, Java offers a more structured approach, making it ideal for large-scale, maintainable projects.
3. Java’s performance lies between C++ and Python faster than Python due to its compiled bytecode but slightly slower than C++ because of JVM overhead.
Q4. What are the prerequisites for learning Java?
Ans: Java is beginner-friendly, and prior programming experience is not mandatory. However, familiarity with basic programming concepts like variables, loops, and conditional statements can be helpful. A solid understanding of object-oriented programming (OOP) principles, such as classes, objects, inheritance, and polymorphism, is beneficial as Java emphasizes OOP.
