I'm using java 9 with jshell for testing java; so, many applets use java 8. Can I install java 8 and java 9 on my windows system?
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- 1Do you..use a lot of applets?Kayaman– Kayaman2016-11-06 19:05:39 +00:00Commented Nov 6, 2016 at 19:05
- I assume Java 9 is backwards compatible with Java 8.shmosel– shmosel2016-11-06 19:06:51 +00:00Commented Nov 6, 2016 at 19:06
- You can keep installing different versions of Java until you run out of disk space. I have 6 versions on my machine.Peter Lawrey– Peter Lawrey2016-11-06 19:15:53 +00:00Commented Nov 6, 2016 at 19:15
- @PeterLawrey I have 9 versions (all the way back to Java 1.4), and I don't even have Java 9 yet. Testing backwards compatibility can be cumbersome. Wish all production code could be upgraded to latest version, that would definitely simplify life.Andreas– Andreas2016-11-06 19:20:24 +00:00Commented Nov 6, 2016 at 19:20
- @Andreas we have a teamcity server which triggers builds in different versions. We do low level stuff so have to test Windows and Linux too. ;)Peter Lawrey– Peter Lawrey2016-11-06 19:26:03 +00:00Commented Nov 6, 2016 at 19:26
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1 Answer
You can only install one Java version that affects the Web Browser (JRE installation), but you can install as many JDK's as you want, just don't installed the JRE that comes with the JDK.
The Web Browser will use the lastest installed JRE that matches the browsers 32/64-bit mode.
Command-line programs, like javac and java, will use the JDK that is on the PATH. You can also fully qualify the path to the programs to override the PATH, e.g. C:\path\to\jdk1.8.0_101\bin\java.exe.
IDE's can usually use any installed JDK.
As example, see this previous answer.
