problem with super in java program

public class StaffMember {

public String name;
public String address;
public String phoneNum;
public String socSecNum;
public String payRate;
String output= " ";

   public StaffMember(String name, String address, String phoneNum, String socsecNum, String payRate){
       this.name= name;
       this.address= address;
       this.phoneNum= phoneNum;
       this.socSecNum= socsecNum;
       this.payRate= payRate;
   }
   public String getName(){
       return name;
   }

   public String getAddress(){
       return address;
    }

   public String getPhoneNum(){
       return phoneNum;
   }

   public void pay(){
       System.out.println(getName()+" was paid $100.");
   }

   public String toString(){
       output += getName()+" "+getAddress()+" "+getPhoneNum();
   return output;
   }
}



public class Employee extends StaffMember{
    double payRate;
   public Employee(){
       super(name);
       super(address);
       super(phoneNum);


    }
    public double getPayRate(double payRate){
        return payRate;
    }
    public String toString(){
        super.toString()+" is paid at a rate of "+ getPayRate();
    }
}


public class Staff {

   StaffMember[] staffList= new StaffMember[10];

   public Staff(){
       // paid staff
       staffList[0]= new StaffMember("Curly Howard", "222 Stooge Street", "8675309", "947-88-2222", "100");
       staffList[1]= new StaffMember("Moe Howard", "222 Stooge Street", "8675309", "999-98-1418", "100");
       staffList[2]= new StaffMember("Larry Fine", "123 Fine Street", "2435555", "955- 85-9090", "100");
       staffList[3]= new StaffMember("Dan Marino", "1972 Dolphin Street", "9991972", "932-77-8684", "100");
       staffList[4]= new StaffMember("Don Shula", "1974 Dolphin Street", "9891973", "953-00-4499", "100");

       // volunteers
       staffList[5]= new StaffMember("Scuba Steve", "Scuba Avenue", "9782345", "413-66-9798", "0");
       staffList[6]= new StaffMember("Diver Dan", "Ocean Avenue", "9752298", "318-75-9999", "0");
       staffList[7]= new StaffMember("Zach", " 21 Jump Street", "9091487", "487-74-9788", "0");
       staffList[8]= new StaffMember("Jon", "Scotch Avenue", "9582745", "495-66-9088", "0");
       staffList[9]= new StaffMember("Jim Bob", "Shuffle Street", "9182005", "413-66-9798", "0");
   }

   public String toString(){
       String result= "";
       for(StaffMember n: staffList){
           result += n.toString();
       }
       return result;
   }

   public void payDay(){
     for(int n =0; n< 5; n++){
         staffList[n].pay();
     }
   }
}