1) The First Error u have to find out by ur self as
the i dont have the entire lines of codes.
2) The 2 error is due to u have to Save this program
in a file named "SimpleSignInExample.java" because u
mentioned it as public  and any class  declared as
public should be saved in file with the class name.
3)The 3 error u have to find the suitable class for
which the method belongs.