I get this error when i compile this Java inheritance OOP. What I'm i doing wrong.

F:\Java\WorkerDemo.java:9: cannot find symbol
symbol : constructor ProductionWorker(java.lang.String)
location: class ProductionWorker
ProductionWorker newProd = new ProductionWorker("Johnsmith");
^
1 error

Tool completed with exit code 1

This is from my codes as below
public class ProductionWorker extends Employee
{
public String Shift;
public double PayRate;


//Default constructor
//Post condition: fname,mName,lName = ""

public ProductionWorker()
{
super();
PayRate = 0.0;
Shift = "";

}

public ProductionWorker(String firstlast, String shift, double rate)
{
super(firstlast);

PayRate = rate;
Shift = shift;
}

//Method to return the first middle last names
//Post condition: The values of fName,mName and lName
//are return as strings

public String toString()
{
String str = super.toString();// + Shift);// + 18.50);
return str;
}

//Method to set fName = first, mName = middle, lName = last
//Post condition: fName,mName,lName = first,middle,last respectively

public double Pay()
{
return (PayRate);

}

//Method to get the fname
//Post condition: fName is return

public void setPayRate( double rate)
{

PayRate = rate;
}

//Method to return the last name
//Post condition: lName is return
public double getPayrate()
{
return PayRate;
}

public void setShift(String shift)
{
Shift = shift;
}

public String getShift()
{
return Shift;
}


}
and Employee class also as follows. The ProductionWorker Extends Employee Class.

public class Employee
{
private String firstlastname;
private String hiredate;
private String empnumber;
private String isValidEmpNum;



//Default constructor
//Post condition: fname,mName,lName = ""

public Employee()
{
empnumber = "";
hiredate = "";
firstlastname = "";

}

public Employee(String firstlast)
{
setName(firstlast);

}

public void setName(String firstlast)
{
firstlastname = firstlast;
}


public String getfirstlastname()
{
return firstlastname;
}

public String toString()
{
return (firstlastname);// + "" + empnumber + " " + hiredate );
}


public void setNumber(String number)
{
empnumber = number;
}

public String getempnumber()
{
return empnumber;
}

public void setDate(String date)
{
hiredate = date;
}

public String gethiredate()
{
return hiredate;
}

public void empvalidation(String isValidEmpNum)
{
if (isValidEmpNum == null)

System.out.println ("Employee Number is invalid");
}

}