Starting Code Given for this application Models a list of

Starting Code Given for this application:

/**
* Models a list of vocabulary words
*/
public class Vocab
{

@Override
public String toString()
{
return words.toString();
}
}

Tester File:

Solve using java for an intro to java class

Solution

Vocab.java

import java.util.ArrayList;
import java.util.Collections;

public class Vocab
{
   ArrayList<String> words = new ArrayList<String>();
   public Vocab(ArrayList<String> list){
       words = list;
   }
   public String longest(){
       if(words == null || words.size() == 0)
           return null;
       String maxString = words.get(0);
       for(int i=1; i<words.size(); i++){
           if(maxString.length() < words.get(i).length()){
               maxString = words.get(i);
           }
       }
       return maxString;
   }
   public double averageLength(){
       if(words == null || words.size() == 0){
           return 0;
       }
       double average;
       int sum = 0;
       for(int i=0; i<words.size(); i++){
           sum = sum + words.get(i).length();
       }
       average = sum/(double)words.size();
       return average;
   }
   public void remove(String target){
       words.removeAll(Collections.singleton(target));
   }
@Override
public String toString()
{
return words.toString();
}
}

VocabTester.java

import java.util.ArrayList;

public class VocabTester
{

public static void main(String[] args)
{
ArrayList<String> theList = new ArrayList<String>();
Vocab empty = new Vocab(theList);
System.out.println(empty.longest());
System.out.println(\"Expected: null\");
System.out.println(empty.averageLength());
System.out.println(\"Expected: 0.0\");
empty.remove(\"interface\");
System.out.println(empty);
System.out.println(\"Expected: []\");

theList.add(\"polymorphism\");
theList.add(\"interface\");
theList.add(\"encapsulation\");
theList.add(\"interface\");
theList.add(\"object-oriented\");
theList.add(\"java\");
theList.add(\"programming\");
Vocab vocab = new Vocab(theList);
  
System.out.println(vocab.longest());
System.out.println(\"Expected: object-oriented\");
System.out.printf(\"%.2f\ \", vocab.averageLength());
System.out.println(\"Expected: 10.43\");
vocab.remove(\"interface\");
vocab.remove(\"java\");
System.out.println(vocab);
System.out.println(\"Expected: [polymorphism, encapsulation, object-oriented, programming]\");
  
  
}
}

Output:

null
Expected: null
0.0
Expected: 0.0
[]
Expected: []
object-oriented
Expected: object-oriented
10.43
Expected: 10.43
[polymorphism, encapsulation, object-oriented, programming]
Expected: [polymorphism, encapsulation, object-oriented, programming]