Installing Java is a quick and simple process that can be done in just a few steps. You will need to have the Java Development Kit (JDK) installed on your computer. The JDK is a software development environment that includes the Java Runtime Environment (JRE), the Java compiler, and other tools needed for developing Java applications. The first step is to download the latest version of Java from the official Oracle website. Once downloaded, you should open the installer file and choose which components you would like to install. Once you have the JDK installed, you can start writing Java programs using any text editor or integrated development environment (IDE) of your choice. Some popular IDEs for Java development include Eclipse and IntelliJ. 

Let's go into the process of setting up the Java development environment on your computer. 

Step 1: Install the Java Development Kit (JDK) 
We have already seen what JDK is and what it is composed of. You can download the JDK from the official Oracle website. Make sure to download the correct version of the JDK for your operating system (Windows, Mac, or Linux). Once the download is complete, run the installer and follow the prompts to install the JDK on your computer. 

Step 2: Set the JAVA_HOME environment variable 
After you have installed the JDK, you need to set the JAVA_HOME environment variable. The JAVA_HOME environment variable will give the location of the JDK installation on your computer. 
To set this environment variable on Windows, one should do the following steps: 
● Right-click on the desktop computer icon or in the Start menu and select Properties. 
● Click on the Advanced system settings link. 
● Click on the Environment Variables button. 
● In the System Variables, find the JAVA_HOME variable. 
● Click on the Edit button. 
● In the Variable value field, enter the path to the JDK installation directory. On Mac and Linux, you can set JAVA_HOME by adding the following line to your .bash_profile or .bashrc file: 

export JAVA_HOME=path_to_jdk 

Step 3: Add the JDK bin directory to the PATH environment variable 
The PATH environment variable tells the operating system where to find the executables for the JDK. To add the JDK bin directory to the PATH: 

On Windows: 
● Follow the steps above to open the Environment Variables window. ● Scroll down and find the PATH variable under System Variables. 
● Click on the Edit button. 
● In the Variable value field, add the path to the JDK bin directory to the end of the list of paths. 
● Make sure to separate the different paths with a semicolon. 

On Mac and Linux: 
● Open the .bash_profile or .bashrc file 
● Add the following line to the file 

export PATH=$PATH:$JAVA_HOME/bin 

Step 4: Verify the installation 
Type the following command in CMD: 
java -version, this command should give you the version of the JDK installed or javac -version, which gives the version of the java compiler installed 

The output would look similar to the following if the installation is successful. 

openjdk version "11.0.15" 2022-04-19 
OpenJDK Runtime Environment Temurin-11.0.15+10 (build 11.0.15+10) OpenJDK 64-Bit Server VM Temurin-11.0.15+10 (build 11.0.15+10, mixed mode)