Java Interface parameter

Question

I'm having trouble understanding this interface problem. I'm supposed to create a Word class with methods getFirst() to return the first character, getLast() to return the last character, getSequence() to return an arraylist of all the characters, and getPosition() should return the int representing the Word's position in the sentence.

I get an error message on the "OrderedThing" parameter (OrderedThing cannot be resolved to a type) - what do I do in the Word class that will solve this? I'm confused on what "OrderedThing" is (type? parameter?)

import java.util.ArrayList;

public interface SequentiallyOrdered {

    public OrderedThing getFirst();
    public OrderedThing getLast();
    public ArrayList<OrderedThing> getSequence();

}

Thanks in advance

OrderedThing is a class that is being used as a return type for your abstract methods. Can you post your Word class? — Drew Kennedy
– Drew Kennedy, Commented Nov 25, 2014 at 16:46
What is OrderedThing, and why aren't you returning Character? Is your interface supposed to be generic? — Elliott Frisch
– Elliott Frisch, Commented Nov 25, 2014 at 16:47

Luke SpringWalker · Accepted Answer · 2014-11-25 16:46:59Z

1

You have to import the class OrderedThing. If you are using eclipse, Ctrl + Shift + O

answered Nov 25, 2014 at 16:46

Luke SpringWalker

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1 Comment

Jonathan C Lee Over a year ago

thanks for the clarification, excuse my novice mistake!

gromm · Accepted Answer · 2014-11-25 17:25:58Z

You should have at least the following:

OrderedThing.java:

public class OrderedThing {

}

SequentiallyOrdered.java:

import java.util.ArrayList;


public interface SequentiallyOrdered {
        public OrderedThing getFirst();
        public OrderedThing getLast();
        public ArrayList<OrderedThing> getSequence();   
}

Word.java:

import java.util.ArrayList;


public class Word implements SequentiallyOrdered {

    @Override
    public OrderedThing getFirst() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public OrderedThing getLast() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public ArrayList<OrderedThing> getSequence() {
        // TODO Auto-generated method stub
        return null;
    }

}

Make sure to implement the SequentiallyOrdered interface in your class and add the unimplemented methods then do your logic inside those methods.

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