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I was wondering if there is any difference running/building a software under JDK 8 and using compiler compliance level 1.7 vs JDK 7 as system default? I am more interested in reference to Android building, building apps, Eclipse, Android Studio, etc.
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javac -source 1.7 (is an alias for javac -source 7 ) java.
The "Compiler Compliance Level" setting equates to the -source option to javac. It indicates which JDK level the source should conform to. This setting does not have to be the same as the JDK level. For example, your default JDK could be 1.6 but the source set to 1.4.
http://www.oracle.com/technetwork/java/javase/jdk8-naming-2157130.html Java SE Development Kit 8, also known as JDK 8, has the version number 1.8. In short – 8 is product version number and 1.8 is the developer version number (or internal version number). The product is the same, JDK 8, anyways.
Java SE 8 is binary-compatible with Java SE 7 except for the incompatibilities listed below. Except for the noted incompatibilities, class files built with the Java SE 7 compiler will run correctly in Java SE 8. Class files built with the Java SE 8 compiler will not run on earlier releases of Java SE.
Yes, there are loads of new classes in the JDK 1.8, for example, the java.time classes. You won't get those if you build in JDK 1.7; but you will be able to use them if you build in JDK 1.8 with compiler compliance level 1.7.
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Yes there is a difference between running/building a software under JDK 8 and using compiler compliance level 1.7 vs JDK 7 as system default.
running a software under JDK 8 and using compiler compliance level : You compile in jdk 1.7 but run on 1.8. No problem, your programm will work as needed.
JDK 7 as system default : You compile in 1.7 version and run on the same version.
I am wondering in waht case you would like to use the first case ?
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