Code report version Error in eclipse

Today, I met the code in eclipse has been an error, but just do not know what the reason, later asked a friend to know is the problem of compiling the environment, record.

The JDK version of the project build path is the one that the compiler needs to use when developing, for example, if you use JDK1.4, you cannot use generics.
And the Java compiler compliance level is set by the Java code you have written, according to what JDK version is compiled, For example: Set is 1.4, the compiled class file can be run on more than 1.4 JRE, if the use of 5-level compilation, you can not run in the environment of 1.4, will be prompted version too high.
As long as the JDK version of Build path is above or equal to the level of Java compiler compliance levels

Code report version Error in eclipse