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View the installed jdk version number and virtual machine version number
View the jdk installation directory
View the installed jdk version number and virtual machine version number
java -version
You can see that it is a 64-bit HotSpot VM. On April 27, 1999, Java HotSpot Virtual Machine (HotSpot for short) was officially released, and since the JDK1.3 version released after that, HotSpot became the default virtual machine of Sun JDK.
View the jdk installation directory
/usr/libexec/java_home -V
Note ⚠️: V is a capital letter
Most JAVA HOMEs are in the /Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Home path
The commonly used tools we usually use to view the internal information of the JVM are in the $JAVA HOME/bin directory. (The screenshot of Home/bin is as follows)
For example, commonly used Java commands for viewing program memory usage: jmap, jhat, jstat, jstack, etc.
You can refer to this article of mine: https://blog.csdn.net/kqZhu/article/details/107495058
