Quickly get started with Java virtual machine: steps and techniques for easy installation

Easy Getting Started: Methods and Techniques to Quickly Install Java Virtual Machine

The Java Virtual Machine (Java Virtual Machine, referred to as JVM) is a tool that ensures that Java programs can be used in different operations Critical components running on the system. Through the JVM, programmers can translate the code written in Java into bytecode that a specific operating system can understand, realizing the dream of "write once, run anywhere". In this article, we will introduce you to the methods and techniques of installing Java virtual machine, and attach specific code examples.

1. Download and install JDK

JDK (Java Development Kit) is a software package required to develop Java programs. It includes JVM and other development tools. First, let us download the latest JDK version from Oracle's official website.

Steps:

• Open Oracle official website (https://www.oracle.com/java/technologies/javase-jdk15-downloads.html)
• Select version for your operating system and download the installation package (usually in .exe or .dmg format).
• Double-click the installation package and follow the installation wizard's prompts to complete the installation process.

2. Configuring environment variables

After installing the JDK, we need to configure the system's environment variables so that Java commands can be executed directly on the command line.

Steps:

• In Windows operating system, open the "Control Panel" and search for "Environment Variables". Select "Edit system environment variables".
• Click the "Environment Variables" button, find the "Path" variable in the "System Variables" section, and click "Edit".
• Add the JDK installation path (for example: C:Program FilesJavajdk1.8.0_251 in) at the end of "Variable Value", and click "OK" to save the changes.

• In Mac OS, open a terminal and execute the following command:

  echo 'export PATH="/Library/Java/JavaVirtualMachines/jdk1.8.0_251.jdk/Contents/Home/bin:$PATH"' >> ~/.bash_profile
  source ~/.bash_profile

##Verify the installation results

After the installation is complete, we can verify whether the JVM was successfully installed through the command line.

Steps:

Open the terminal or command line interface.
• Execute the following command:

  java -version

If the JVM version information is displayed, the installation is successful. Otherwise, the environment variables may be configured incorrectly, please check again.

Write and run a Java program

Now, we can write a simple Java program to test the running effect of the JVM.

Steps:

Open any text editor and create a file named
• HelloWorld.java.
• Enter the following code in the file:

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

Save the file and enter the directory where the file is located through the command line.
• Execute the following command:

  javac HelloWorld.java
  java HelloWorld

If "Hello, World!" is successfully output, it means that your Java program has run successfully.

Summary

Through the above steps, we can easily install and configure the Java virtual machine, and write and run Java programs. I hope that the methods and techniques in this article can help you get started with Java development quickly and lay the foundation for your future learning and practice.

Code sample:

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

Please note that the above code sample is for demonstration purposes only. In actual development, more complex code and functions may be required.

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