Create a Java Bean to be of type HashSet and get error in editor

Question

This is my code:

package ca.wfsystems.core;

import lotus.domino.Base;
import lotus.domino.Session;
import lotus.domino.Database;
import lotus.domino.View;
import lotus.domino.NotesException;
import lotus.domino.ViewEntry;
import lotus.domino.ViewEntryCollection;

import java.io.Serializable;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.Vector;



import com.ibm.xsp.extlib.util.ExtLibUtil;
import ca.wfsystems.core.*;


**public class ssAppMenu implements Serializable , HashSet<String>{**

private static final long serialVersionUID = 1L;

    public ssAppMenu(){

    }

}

The public class line gives this error: The type HashSet cannot be a superinterface of ssAppMenu; a superinterface must be an interface

All I want is a set of values in a list in the order I place them. I don't need a construct. From what I have read I believe the HashSet does that but not sure how to format the public class line.

Answer 1

HashSet is an implementation of interface Set. You need to define

public class ssAppMenu extends LinkedHashSet<String> implements Serializable

Answer 2

HashSet is a class, not an interface. Don't implement, extend it. http://docs.oracle.com/javase/7/docs/api/java/util/HashSet.html