Chapter 11, Problem 15E

Explanation of Solution

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

//import the required packages

import java.util.ArrayList;

import java.util.HashMap;

import java.util.HashSet;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

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>(); 

        //add the values to list 1

        stringsSet.add(3);

        stringsSet.add(7);

        stringsSet.add(3);

        stringsSet.add(3);

        stringsSet.add(2);

        stringsSet.add(3);

        stringsSet.add(3);

        //Call the method

        System.out.println(maxOccurrences(stringsSet));

    }

    //Definition of method maxOccurences

    public static int maxOccurrences(List<Integer> list)

    {

        //Create an object counts

Map<Integer, Integer> counts = new HashMap<Integer, Integer>();

        //Traverse the list

        for (int value : list)

        {

        //Check whether the value present in the list

        if (counts...