Chapter 11, Problem 7E

Explanation of Solution

Method “countCommon()” to return the number of common integers in the two list:

//import the required packages

import java.util.ArrayList;

import java.util.HashSet;

import java.util.Iterator;

import java.util.List;

import java.util.Set;

//define the class

public class Test

{

    //define the static method

    public static void main(String[] args)

    {

          //create a set

List<Integer> stringsSet=new ArrayList<Integer>(); 

List<Integer> stringsSet1=new ArrayList<Integer>();

        //add the values to list 1

        stringsSet.add(3);

        stringsSet.add(7);

        stringsSet.add(3);

        stringsSet.add(-1);

        stringsSet.add(2);

        stringsSet.add(3);

        stringsSet.add(7);

        stringsSet.add(2);

        stringsSet.add(15);

        stringsSet.add(15);

        //Add the values to list 2

        stringsSet1.add(-5);

        stringsSet1.add(15);

        stringsSet1.add(2);

        stringsSet1.add(-1);

        stringsSet1.add(7);

        stringsSet1.add(15);

        stringsSet1...