Exception in thread "main" java.lang.UnsupportedClassVersionError

Error message:

Exception in thread “main” java.lang.UnsupportedClassVersionError: com/shizongger/sort/SelectorSort : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

Generally, it is caused by the high version compiling and running the low version. The first step is to check whether the compiled version of Java is consistent with the running version:

shizongger@shizongger:~$ javac -version
javac 1.7.0_79

java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)

The compiled and run versions are the same, let's see if it is the Eclipse compiled version. Right-click the project->Properties->Java Compalier->Jdk Compliance, set the Jdk version to 1.7, and click OK->Apply.
Problem solved since this.