Version check with --version and -version in Java 8 and Java 11

问题

Java 11

JAVA_HOME : C:\Program Files\Java\jdk-11.0.4

I was able to find Java version in cmd with following command:

java --version  //successfully executed

java -version  //successfully executed

Java 8

 JAVA_HOME : C:\Program Files (x86)\Java\jdk1.8.0_231

I was able to find Java version in cmd with following command:

java -version  //successfully executed

while I was unable to find java version with --version command

java --version  //not successfully executed

Why I get error that Java Virtual Machine could not be created when I execute --version, or just this command option not available in jdk 8? If it was added in jdk 11 then where is it mentioned in doc?

回答1:

The option was introduced in Java 9.

See here, if you search for --version it's the first version in which it appears in the java tool's documentation (the java tool's documentation for Java 8 doesn't mention it).

来源：https://stackoverflow.com/questions/59152510/version-check-with-version-and-version-in-java-8-and-java-11