Is it okay to have 2 JDK installed?

Yes, you can. Just use full path names when invoking javac , java , etc. or set your PATH environment variable to point to the appropriate jdk/bin location. The IDEs usually allow defining multiple JDKs/JREs, and you can choose which one to use for every project.

Can I install multiple versions of JDK on Windows?

You may install different JDKs easily: just specify different folders. No, Sun will only always see the last version you installed. Also, you can install, copy the directory somewhere and then uninstall. Java doesn’t need the registry keys to work.

Can you have 2 Java versions?

It is very possible to run multiple versions of Java on the same machine so you can run your existing applications and Ignition at the same time.

Can I use JDK 11 instead of JDK 8?

It is one of the features which is added in Java 11. Multi-jar provides a way to still the code with the latest features of Java 11 while maintaining support and functionality for Java 8 clients.

How can I change Jdk 11 to JDK 8?

1 Answer

1. You have to install the openjdk-8-jre : sudo apt-get install openjdk-8-jre.
2. Next switch to the jre-8 version: $ sudo update-alternatives –config java There are 2 choices for the alternative java (providing /usr/bin/java).

Is it possible to download multiple JDK files at once?

the answer is yes. Since both JDK files are downloaded as jar fils it will ok to download both jar files. The reason to not opening after two java versions is as @Elliott said: “in the system is Java 6 can’t run Java 8 compiled code, you should be getting an error.”

Can I install multiple versions of Java SDKs?

Yeah, you can install as many Java SDKs as you want. When you develop you just use the JDK you want to use. Yes you can. JDK is merely a directory somewhere on your disk. So you can easily download and unpack all the versions you want, and run java and javac from the directory you’re currently interested in.

Is it possible to use multiple versions of Java under Windows?

Of course you can use multiple versions of Java under Windows. And different applications can use different Java versions. How is your application started? Usually you will have a batch file where there is something like java This will search the Java executable using the PATH variable.

How do I get all the different versions of JDK?

JDK is merely a directory somewhere on your disk. So you can easily download and unpack all the versions you want, and run java and javac from the directory you’re currently interested in. IDEs will do all the messy stuff for you: just let them know where the unpacked JDKs are, and choose a JDK in project’s or module’s settings. PS.