The first error  indicates that the method  include() doesn't exist. If you want
to import in java  you put import package.ClassName before your class  declaration
at the top of your Java source code. Take note that you should not import
java.lang.* as it is already imported by default.

Second you need to actually have either a Keyin class with a static  method
inInt() or a variable  called Keyin which is an instance of a class which has the
method inInt().

Based on what you have written I suggest you go and read
java.sun.com/.../index.html