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Installation and Configuring of Java SDK with live examples

MINTY CODER INTERNATIONAL August 23, 2023


In this tutorial am going to guide you briefly on how this process can be done easily 

Sure, I'd be happy to provide you with a complete guide on installing and configuring Java SDK

Before we begin, it's worth noting that the Java SDK (Software Development Kit) is a collection of tools, libraries, and documentation that developers use to build Java applications. The SDK includes the Java Runtime Environment (JRE), which is needed to run Java applications, as well as the Java Development Kit (JDK), which includes tools for developing and debugging Java code.

In this guide, we'll cover the following topics:


  • System Requirements
  • Downloading the Java SDK
  • Installing the Java SDK
  • Setting the JAVA_HOME Environment Variable
  • Testing the Java Installation

Let's get started.

System Requirements

Before installing the Java SDK, make sure your system meets the minimum requirements. The requirements vary depending on the version of the SDK you're installing, so be sure to check the documentation for the specific version you plan to install. Generally, the requirements are as follows:

Operating system: Windows, macOS, or Linux
Processor: 64-bit processor
RAM: 2 GB or more
Disk space: 2 GB or more
Downloading the Java SDK
To download the Java SDK, go to the Oracle website (https://www.oracle.com/java/technologies/javase-downloads.html) and select the version of the SDK you want to download. You'll be prompted to accept the license agreement before you can proceed with the download.

Once you've accepted the license agreement, select the appropriate download for your operating system. For example, if you're running Windows, you'll want to download the Windows version of the SDK.

Installing the Java SDK

To install the Java SDK, follow these steps:

Run the installer file you downloaded in the previous step.
Follow the prompts to complete the installation process. You can accept the default settings, or customize the installation if you prefer.
Once the installation is complete, you should see a message indicating that the installation was successful.
Setting the JAVA_HOME Environment Variable
After installing the Java SDK, you need to set the JAVA_HOME environment variable. This variable tells your system where to find the Java SDK. Here's how to set the variable:

Open the Control Panel.
Go to System and Security > System > Advanced system settings.
Click the Environment Variables button.
Under System Variables, click the New button.
Enter JAVA_HOME as the variable name.
Enter the path to the Java SDK installation directory as the variable value. For example, if you installed the SDK in C:\Program Files\Java\jdk-11.0.11, you would enter that path as the variable value.
Click OK to save the variable.
Testing the Java Installation
To test the Java installation, open a command prompt (Windows) or terminal window (macOS or Linux) and enter the following command:

Copy code

java -version

This will display the version of Java that's currently installed on your system. If you see a version number, then Java is installed correctly.

Now that you've installed and configured the Java SDK, let's look at some live examples of how to use it.

Example 1: Compiling and Running a Java Program

To compile and run a Java program, follow these steps:

Create a new file called HelloWorld.java and enter the following code:
 
public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

Save the file in a directory of your choice.

Open a command prompt (Windows) or terminal window (macOS or Linux) and navigate to the directory where you saved the HelloWorld.java file.

Compile the program by entering the following command:


javac HelloWorld.java
This will create a new file called HelloWorld.class.

Run the program by entering the following command:

java HelloWorld
This will execute the program and output the message "Hello, World!" to the console.

Example 2: Using an External Library

To use an external library in a Java program, follow these steps:

Download the library and save it to a directory of your choice. For this example, we'll use the Apache Commons Lang library, which provides a number of utility classes for working with strings, numbers, and other data types.

Create a new file called StringUtilsExample.java and enter the following code:


import org.apache.commons.lang3.StringUtils;





public class StringUtilsExample {
    public static void main(String[] args) {
        String text = "   hello world   ";
        String trimmed = StringUtils.trim(text);
        System.out.println(trimmed);
    }
}





Save the file in the same directory as the Apache Commons Lang library.

Compile the program by entering the following command:

javac -cp commons-lang3-3.12.0.jar StringUtilsExample.java

This will create a new file called StringUtilsExample.class.

Run the program by entering the following command:

java -cp commons-lang3-3.12.0.jar:. StringUtilsExample

This will execute the program and output the message "hello world" to the console.

In this example, we used the -cp option to specify the classpath, which tells Java where to find the external library. The classpath includes the name of the library (commons-lang3-3.12.0.jar) and a dot (.) to indicate the current directory.

I hope this guide has been helpful in showing you how to install and configure the Java SDK, as well as providing some examples of how to use it. If you have any further questions or concerns, please don't hesitate to ask

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