Java HotSpot VM - JVM by Oracle/Sun

JVM Tutorials - Herong's Tutorial Examples

∟Download and Install JDK on Windows

This section provides a tutorial example on how to download and install the latest version JDK, which contains the HotSpot JVM, on a Windows system. A simple Java program was entered, compiled, and executed to verify the JDK installation.

In order try the HotSpot JVM, I downloaded and installed JDK 17 (Java SE 17) on my Windows computer:

Open the Java SE Download page with this URL: https://www.oracle.com/java/technologies/downloads/.
Click the "Windows" tab under the "Java SE Development Kit 17.0.1 downloads". You will see a new page with a list of different download files of JDK 17.
Click the hyper link of "https://download.oracle.com/java/17/latest/jdk-17_windows-x64_bin.exe", next to "x64 Installer 152 MB".
Save jdk-17_windows-x64_bin.exe to a temporary directory.
Double-click on jdk-17_windows-x64_bin.exe to start the installation wizard.
The installation wizard will guide you to finish the installation.

To test the installation, open a command window to try the java command. If you are getting the following output, your installation is good:

herong> \progra~1\java\jdk-17.0.1\bin\java -version

java version "17.0.1" 2021-10-19 LTS
Java(TM) SE Runtime Environment (build 17.0.1+12-LTS-39)
Java HotSpot(TM) 64-Bit Server VM 
  (build 17.0.1+12-LTS-39, mixed mode, sharing)

Once the JDK is installed, you can try to use it to compile and execute a simple Java program:

1. Use Notepad to enter the following Java program into a file called Hello.java:

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

2. Then compile this program in a command window with the "javac" command:

herong> \progra~1\java\jdk-17.0.1\bin\javac Hello.java

3. To execute the program, use the "java" command:

herong> \progra~1\java\jdk-17.0.1\bin\java Hello

Hello world!

Cool, I have successfully:

Created a program in Java 17.0.1 language.
Compiled the program with JDK 17.0.1 compiler.
Executed the program with HotSpot JVM 17

Table of Contents

About This Book

JVM (Java Virtual Machine) Specification

►Java HotSpot VM - JVM by Oracle/Sun

java.lang.Runtime Class - The JVM Instance

java.lang.System Class - The Operating System

ClassLoader Class - Class Loaders

Class Class - Class Reflections

JVM Runtime Data Areas

JVM Stack, Frame and Stack Overflow

Thread Testing Program and Result

CPU Impact of Multi-Thread Applications

I/O Impact of Multi-Thread Applications

CDS (Class Data Sharing)

Micro Benchmark Runner and JVM Options

Micro Benchmark Tests on "int" Operations

Micro Benchmark Tests on "long" Operations

Micro Benchmark Tests in JIT Compilation Mode

Micro Benchmark Tests on "float" and "double" Operations

OpenJ9 by Eclipse Foundation

JRockit JVM 28.2.7 by Oracle Corporation

Archived Tutorials

References

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