Chapter 11, Problem 13E

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.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 map

        Map map1=new HashMap();

        //map the values

        map1.put("MArty","Stepp");

        map1.put("Stuart", "Reges");

        map1.put("Jessica", "Miller");

        map1.put("Amanda", "Camp");

        map1.put("Hal", "Perkins");

        //Call the method

        System.out.println(isUnique(map1));

    }

    //Definition of method countCommon()

public static boolean isUnique(Map<String, String> map)

    {

        //Create an object

        Set<String> values = new HashSet();

        //Traverse the map values

        for (String value : map...