Java package not found

Hi All, I am trying to compile a simple java program  to use it in worflow,

I tried to program as per the sample code guidelines in implementation guide....

package com.demantra.workflow.step;

import com.demantra.workflow.parameters.

*;public class SampleCustomStep implements CustomStep{public SampleCustomStep()

{}public int executeStep(Parameter[] parms)

int i, length = parms != null ? parms.length : 0;for(i=0; i<length; i++)

System.out.println("Parameter name : " + parms[i].getName() + " value: " + parms[i].getValue());

// write your own logic here// ......................

return LinkedStep.ST_COMPLETED;}}

I am getting error as package com.demantra.workflow.parameters does not exist .. Is there any way to check the seeded java programs just to get the format etc...?