Java Part 1: Setup and Introduction

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Introduction

Welcome to Java beginner tutorial series. In this article you will learn how to setup Java on your machine. Java is a popular programming language used for developing desktop applications, web applications, and mobile applications. To get started with Java programming, you need to set up a development environment on your computer. In this article, we’ll guide you through the process of installing Java, setting up Eclipse IDE, and writing a “Hello World” program in both Windows and Linux.

Setup

Installing Java in Windows

Step 1: Download Java Development Kit (JDK)

To install Java in Windows, the first step is to download the Java Development Kit (JDK) from the Oracle website. Go to the Oracle website and download the latest version of the JDK for Windows.

Step 2: Install JDK

Once you have downloaded the JDK, double-click the installation file and follow the instructions to install the JDK on your computer. Make sure to set the path to the JDK installation directory in the system environment variables.

Step 3: Verify JDK Installation

After the installation is complete, open the Command Prompt and type “java -version” to verify that the JDK is installed correctly.

Installing Java in Linux

Step 1: Open Terminal

To install Java in Linux, open the Terminal and type the following command to install the OpenJDK package:

sudo apt-get install default-jdk

Step 2: Verify JDK Installation

After the installation is complete, type “java -version” to verify that the JDK is installed correctly.

Setting up Eclipse IDE in Windows and Linux

Step 1: Download Eclipse

Go to the Eclipse website and download the Eclipse IDE for Java Developers.

Step 2: Install Eclipse

Once you have downloaded Eclipse, extract the ZIP file to a directory of your choice.

Step 3: Open Eclipse

To open Eclipse, navigate to the directory where you extracted the ZIP file and double-click on the eclipse.exe file.

Writing a “Hello World” program in Eclipse IDE

Step 1: Create a new Java Project

To create a new Java project, click on File -> New -> Java Project. Give the project a name and click on “Finish”.

Step 2: Create a new Java Class

To create a new Java class, right-click on the project and click on New -> Class. Give the class a name and click on “Finish”.

Step 3: Write the “Hello World” program

In the new class, write the following code:

package com.example;

public class HelloWorld { 
    public static void main(String[] args) { 
        System.out.println("Hello World!"); 
    } 
}

Note:

The package com.example line at the beginning of the code specifies the name of the package to which the class belongs. In this example, the class HelloWorld is part of the com.example package.

Step 4: Run the program

To run the “Hello World” program, right-click on the class and click on “Run As” -> “Java Application”. The program output will appear in the console.

Conclusion

Setting up Java and Eclipse IDE in both Windows and Linux is a straightforward process. With these tools installed, you can begin writing Java programs and developing your skills as a programmer. By following the steps outlined in this article, you should be able to set up your development environment and write your first “Hello World” program.

Java Beginner Tutorial Series