cannot use "SavitchIn"

My version is j2sdk1.4.2_01

My Program is simple:

public class Change{

public static void main(String[] args){

int amount;

amount = SavitchIn.readLineInt();

System.out.println(amount);

}

}

after I complie it, it shows:

Change.java:6: cannot resolve symbol

symbol : variable SavitchIn

location: class Change

amount = SavitchIn.readLineInt();

^

1 error

Is this version of program not content "SavitchIn.class"?

If so, how can I fix this problem?

I have installed the program in my computer in c:\j2sdk1.4.2_01,

and have added the path into the system path as c:\j2sdk1.4.2_01;c:\j2sdk1.4.2_01\bin; c:\j2sdk1.4.2_01\jre\bin

but it still doesn't work.

Please Help!

[795 byte] By [clivengtw] at [2007-9-30 21:34:42]