Question

I’m trying to extend my policy class, which takes a double value.
I tried extending it by

public class DepreciablePolicy extends Policy {    

}

But I get an error, “Policy in class policy cannot be applied to given types; required: double, found no arguements”. I was wondering how I can fix this? The extend statement was valid when I made my Policy void, but then the Policy method doesnt work if it’s a void.

public class Policy {
   double amount;
   int policyNumber;
   public static int policyCount = 1;


   public Policy(double a){
    amount = a;
    policyNumber = policyCount;
    policyCount ++;
  }

    public boolean isExpired(){
        return false;
    }

    public void print(){
        System.out.print("Policy #" + this.policyNumber + " with amount $" + this.amount);
        }        
     }

Answer 1

As your Policy class doesn’t have a no-args default constructor defined, You have to explicitly make a call the super class’s constructor from your DepreciablePolicy constructor.

public class DepreciablePolicy extends Policy {    
public DepreciablePolicy(double d){
super(d)
}

}