A FilteredData class and Measurable interface are included below. Create an inte

Question

A FilteredData class and Measurable interface are included below. Create an interface Filter

public interface Filter {

    boolean accept(Object o);

}

Modify FilteredData to optionally take a Filter on its constructor(s). A FilteredData object that has a Filter ignores Measurable objects that its filter does not accept.

Write a method to test your FilteredData object. Your tests should include

multiple FilteredData objects, at least one with no filter, others using a filter

at least two different Filter implementations

Measurable objects that both pass and don't pass the Filters.

FilteredData class and Measurable interface are below:

import java.util.ArrayList;

public class FilteredData {

   private ArrayList<Measurable> ds;
   private Measurable min;
   private Measurable max;

   public FilteredData() {
       ds = new ArrayList<>();
       min = null;
       max = null;
   }

   public void add(Measurable ele) {
       if ((min == null) || (min.getMeasure() > ele.getMeasure())) {
           min = ele;
       }

       if ((max == null) || (max.getMeasure() < ele.getMeasure())) {
           max = ele;
       }

       ds.add(ele);
   }

   public Measurable getMin() {
       return min;
   }

   public Measurable getMax() {
       return max;
   }

}

public interface Measurable {

   int getMeasure();

}

Explanation / Answer

public interface Filter
{
boolean accept(Object o);
}
public class ShortWordFilter implements Filter
{
public boolean accept(Object o)
{
return x.toString().length() < 5;
}
public static ArrayList<Object> collectAll(ArrayList<Object> objects, Filter f)
{
ArrayList<Object> collected = new ArrayList<Object>();
for (Object object : collected)
{
if (f.accept(object))
{
collected.add(object);
}
}
return collected;
}
}

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