JVM Tutorials - Herong's Tutorial Examples - v5.12, by Dr. Herong Yang
Download and Install JDK on macOS
This section provides a tutorial example on how to download and install the latest version JDK, which contains the HotSpot JVM, on a macOS 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 14 (Java SE 14) on my macOS system:
1. Go to Oracle Java SE download website at https://www.oracle.com/java/technologies/javase-downloads.html.
2. Click "JDK Download" next to "Java SE 14".
3. Click "jdk-14.0.1_osx-x64_bin.tar.gz" at the "macOS Compressed Archive" Line from the download list. It will be saved to your "Downloads" directory automatically.
4. Start a Terminal window and run commands below to install it.
herong$ cd ~/Downloads herong$ gunzip jdk-13_osx-x64.bin.tar.gz herong$ tar -xf jdk-14.0.1_osx-x64_bin.tar herong$ sudo mv jdk-14.0.1.jdk/ /Library/Java/JavaVirtualMachines/ herong$ java -version java version "14.0.1" 2020-04-14 Java(TM) SE Runtime Environment (build 14.0.1+7) Java HotSpot(TM) 64-Bit Server VM (build 14.0.1+7, mixed mode, sharing)
Note that you don't have to remove JDK older versions. They can stay their quietly together with the newer version as shown below:
herong$ ls -l /Library/Java/JavaVirtualMachines/ drwxr-xr-x@ 5 herong staff 170 Feb 13 21:05 jdk-13.jdk drwxr-xr-x@ 3 herong staff 102 Mar 5 19:08 jdk-14.0.1.jdk
Another way to install JDK is to using the *.dmg file, which can integrate better with Safari and other Applications.
Table of Contents
JVM (Java Virtual Machine) Specification
►Java HotSpot VM - JVM by Oracle/Sun
►Download and Install JDK on macOS
Download and Install Latest JDK on Windows
Running Java HotSpot Client VM
Running Java HotSpot Server VM
HotSpot Memory Usages on Windows Systems
java.lang.Runtime Class - The JVM Instance
java.lang.System Class - The Operating System
ClassLoader Class - Class Loaders
Class Class - Class Reflections
JVM Stack, Frame and Stack Overflow
Thread Testing Program and Result
CPU Impact of Multi-Thread Applications
I/O Impact of Multi-Thread Applications
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