Chapter 12, Problem 6E

Method definition for “getCommonStrings”:

/* Method definition for "getCommonStrings"

public static ArrayList<String> getCommonStrings(ArrayList<String> list1, ArrayList<String> list2)

{

    /* Create array for store resultant strings */       

ArrayList<String> resultantStrings = new ArrayList<String>();

    for(int i = 0; i < list1.size(); i++)

    {

        for(int j = 0; j < list2.size(); j++)

        {

/* Check if the string in "list1" is equal to string in "list2", then */

            if(list1.get(i).equals(list2.get(j)))

/* Add the given string to "resultantStrings" */

resultantStrings.add(list1.get(i));

        }

    }

    /* Removing duplicate strings using "for" loop */

for(int index = 0; index < resultantStrings.size(); index++)

    {

        int idx = index+1;

/*This loop will performs "idx" is less than "data.size()"  */

        while(idx < resultantStrings.size())

        {

/* If the character "resultantStrings.get(index)" is equal to "resultantStrings.get(idx)", then */

if(resultantStrings.get(index) == resultantStrings.get(idx))

/* Remove the character by using "remove" method */

                resultantStrings.remove(idx);

            //Otherwise

            else

                //Increment the value of "idx"

                idx++;

        }

    }

    return resultantStrings;

}

Complete code:

The complete code for after implementing “getCommonStrings” method is given below:

//Import required package

import java.io.*;

import java.util.*;

//Define "CommonStringsTest" class

public class CommonStringsTest

{

    //Define main function

    public static void main(String[] args)

    {

        //Create an array list for list 1

ArrayList<String> list1 = new ArrayList<String>();

        //Create an array list for list 2

ArrayList<String> list2 = new ArrayList<String>();

        /* Add string to list 1 using "add" method */

        list1.add("John");

        list1.add("Merry");

        list1.add("Rose");

        list1.add("Jansi");

        /* Add string to list 2 using "add" method */

        list2.add("Rose");

        list2.add("Watson");

        list2.add("John");

        list2...