Does Hello World! program compiled by JDK 7u3 runs with an older JREs (eg. JRE 6)?
If the answer is YES, When a java program doesn’t run with an older JRE?
Does Hello World! program compiled by JDK 7u3 runs with an older JREs (eg.
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Does Hello World! program compiled by JDK 7u3 runs with an older JREs (eg. JRE 6)?
If the answer is YES, When a java program doesn’t run with an older JRE?
By default the class files produced by javac will have a version number appropriate for the JDK they were produced on. To produce class files for earlier versions you will need to specify
-targetand to do that you will also need-source.-source 1.6 -target 1.6say.However, you will still be picking up the current Java library, which contain classes, methods (possibly overloads), etc., that were not in the previous version. To sort that out, use
-bootclasspathto point to thert.jarof the target JRE.