Don't know where the error

import javax.swing.JOp tionPane;
public class AddStaff{

public static void main(String args[]){
String StaffName;
String StaffCurrPositi on;
String Salary;
String SalaryInDouble;
int x;

SalaryCalculati on[] StaffSalary = new SalaryCalculati on[2];

for (x = 0; x < 2; x++){
StaffName = JOptionPane.sho wInputDialog("P lease enter Staff Name");
StaffCurrPositi on = JOptionPane.sho wInputDialog("P lease enter STAFF
POSITION");
Salary = JOptionPane.sho wInputDialog("P lease enter STAFF SALARY");
StaffSalary[x] = new SalaryCalculati on(StaffName,St affCurrPosition ,Salary);
}
StaffName = JOptionPane.sho wInputDialog("P lease enter Manager Name");
StaffCurrPositi on = JOptionPane.sho wInputDialog("P lease enter Staff
POSITIOn");
Salary = JOptionPane.sho wInputDialog("P lease enter Staff Salary");
SalaryCalculati on Manager = new
SalaryCalculati on(StaffName,St affCurrPosition ,Salary);

//View Staff Information;

StaffName = StaffSalary[0].ReturnStaffNam e(); //<< the error




}
}


public class SalaryCalculati on{
String StaffName;
String CurrPosition;
String Salary;
double SalaryInDouble;
public SalaryCalculati on(String StaffName,Strin g CurrPosition,St ring
Salary){
StaffName = StaffName;
CurrPosition = CurrPosition;
Salary = Salary;
ToUpperCase();
SalaryConvertin g();
SalaryCalculati on();
}

private void ToUpperCase(){
StaffName = StaffName.toUpp erCase();
}

private void SalaryConvertin g(){
SalaryInDouble = Double.parseDou ble(Salary);
}
private void SalaryCalculati on(){
SalaryInDouble = SalaryInDouble * 5 / 100;
}

public double ReturnSalary(){
return SalaryInDouble;

}
public String ReturnStaffName (){
return StaffName;
}
public String ReturnPosition( ){
return CurrPosition;
}

}


i try to fix the error for damn long hours.. still can't fix it..

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"If we don't stand together than this is the end"
The Business