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

Java has much differences with PHP. I suggest, if you
want to learn a new programming  language, read the
example program's source code  and write it. Just write
the code you read. Then, please take attention, how
the new language differ from the old.

Second, you can use the java  IDE or Text Editor that
support syntax highlighting (such as editplus). This
will help  you to determine the syntax error  before you
compile your code.

The last, read the books or java tutorial as Anthony
Eden suggested.

Java is a bit weird. Only as input function from
keyboard we have to write a program  for that. First
time for me experiencing make an keyboard input
program.

import java.lang.*;
public class  cobain
{
public static  void main(String[] args)
{
int userinput;
userinput = Keyin.inInt("Enter your option  : ");

}

}