How to Run Jar on java 7 compiled in java 8 or higher version [duplicate]

问题

This question already has answers here:

How do I compile a .java with support for older versions of Java? (5 answers)

Closed 8 months ago.

I have created a windows application using java 8 . But my client is using java 7 on his machine and not able to upgrade java on the machine.

So when i run jar on java7 compiled in java 8 it gives error so can i convert jar compatible to lower version java

回答1:

You can't change a compiled jar's Java version. You have 2 option in hand.

1. Compile the Source code using Java-7.

2. Compile source code using Java-8 but using the following command when target vm version is java-7.

javac "Your java classes" -source 1.8 -target 1.7

回答2:

Java 7 is forward compatible with Java 8. Java 8 can be compiled so that it runs on a Java 7 VM (with -source 7 -target 7), but you can’t use any of the newer APIs. Just Compile with JAVA 7 and you would be good to go just make sure you are not using new features of java 8 like lamda

回答3:

You can't. You need to compile with Java 7. You can run multiple Java version and choose which version should be used to compile: Multiple Java versions running concurrently under Windows

来源：https://stackoverflow.com/questions/55648231/how-to-run-jar-on-java-7-compiled-in-java-8-or-higher-version