final_exam_03

package final_exam_03;
import java.util.*;

interface Condition
{
    public abstract boolean satisfies(String s);
}

class WordsLen implements Condition
{
    int length;

    public WordsLen(int length)
    {
        this.length = length;
    }

    public boolean satisfies(String s)
    {
        if(this.length==s.length())
        {
            return true;
        }
        return false;
    }
}

class WordsTwiceInRow implements Condition
{
    public boolean satisfies(String s)
    {
        int count = 0;
        for(int i=0;i<s.length()-1;i++)
        {
            if(s.charAt(i) == s.charAt(i+1))
            {
                count++;
            }
        }

        if(count==0) return false;
        else return true;
    }
}



public class final_exam_03
{
    public static ArrayList<String> countWords(String arr[] , Condition f)
    {
        ArrayList<String> r = new ArrayList<String>();
        for(int i=0;i<arr.length;i++)
        {
            if(f.satisfies(arr[i]))
            {
                r.add(arr[i]);
            }
        }
        return r;
    }

    public static void main(String[] args)
    {
        String arr[] = {"hello","world","this","if","that","too"};
        System.out.println(countWords(arr,new WordsLen(5)));
        System.out.println(countWords(arr,new WordsTwiceInRow()));
    }
}