Question

Here is my assignment:

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Consider the following client class:

import java.util.Collection;

import java.util.Collections;

import java.util.HashMap;

import java.util.Map;

import java.util.Set;

public class PresidentsMain {

      public static void main(String[] args) {

            Map<String, String> PresidentsOfTheUnitedStates = new HashMap<String, String>();

            PresidentsOfTheUnitedStates.put("George Washington", "Unaffiliated");

            PresidentsOfTheUnitedStates.put("John Adams", "Federalist");

            PresidentsOfTheUnitedStates.put("Thomas Jefferson", "Democratic-Republican");

            PresidentsOfTheUnitedStates.put("James Madison", "Democratic-Republican");

            PresidentsOfTheUnitedStates.put("James Monroe", "Democratic-Republican");

            PresidentsOfTheUnitedStates.put("John Quincy Adams", "Democratic-Republican");

            PresidentsOfTheUnitedStates.put("Andrew Jackson", "Democratic");

            PresidentsOfTheUnitedStates.put("Martin Van Buren", "Democratic");

            PresidentsOfTheUnitedStates.put("William Henry Harrison", "Whig");

            PresidentsOfTheUnitedStates.put("John Tyler", "Whig");

           }

      }

}

Extend given client class:

• Implement a static method called FilterMapByValue, that takes 2 parameters:
  • Map<String, String> InMap;
  • String TargetValue;

Method should print out all map elements, for which Value == TargetValue. Test the implementation by filtering PresidentsOfTheUnitedStates map so that only presidents, affiliated with Democratic-Republican party are printed. Note: use the following to iterate over a map:

              for (Map.Entry<String,String> Entry : InMap.entrySet())   

• Implement a method PrintValues, that prints all values for a given map (use map’s values() function). Test the implementation on PresidentsOfTheUnitedStates map.
• Implement a method PrintKeys, that prints all keys for a given map (use map’s keySet() function). Test the implementation on PresidentsOfTheUnitedStates map.

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I got this today and it's due tomorrow. I'm lost in this class and don't understand how to do this :(

Answer 1

ANSWER:-

CODE:-

import java.util.Collection;

import java.util.Collections;

import java.util.HashMap;

import java.util.Map;

import java.util.Set;

public class PresidentsMain {

      public static void filterMapByValue(Map<String,String> inMap, String targetValue){
            for (Map.Entry<String,String> entry : inMap.entrySet()){
                  if(targetValue.equals(entry.getValue())){
                        System.out.println(entry.getKey()+" - "+entry.getValue());
                  }
            }
      }
      public static void printValues(Map<String,String> map){
            for(String value : map.values()){
                  System.out.println(value);
            }
      }
      public static void printKeys(Map<String,String> map){
            for(String key : map.keySet()){
                  System.out.println(key);
            }
      }
      public static void main(String[] args) {

            Map<String, String> PresidentsOfTheUnitedStates = new HashMap<String, String>();

            PresidentsOfTheUnitedStates.put("George Washington", "Unaffiliated");

            PresidentsOfTheUnitedStates.put("John Adams", "Federalist");

            PresidentsOfTheUnitedStates.put("Thomas Jefferson", "Democratic-Republican");

            PresidentsOfTheUnitedStates.put("James Madison", "Democratic-Republican");

            PresidentsOfTheUnitedStates.put("James Monroe", "Democratic-Republican");

            PresidentsOfTheUnitedStates.put("John Quincy Adams", "Democratic-Republican");

            PresidentsOfTheUnitedStates.put("Andrew Jackson", "Democratic");

            PresidentsOfTheUnitedStates.put("Martin Van Buren", "Democratic");

            PresidentsOfTheUnitedStates.put("William Henry Harrison", "Whig");

            PresidentsOfTheUnitedStates.put("John Tyler", "Whig");

            System.out.println("Presidents of Democratic-Republican party: ");
            filterMapByValue(PresidentsOfTheUnitedStates,"Democratic-Republican");
            System.out.println();
            System.out.println("Keys: ");
            printKeys(PresidentsOfTheUnitedStates);
            System.out.println();
            System.out.println("Values: ");
            printValues(PresidentsOfTheUnitedStates);

      }

}

NOTE:- If you need any modifications in the code,please give positive rating.Please give positive rating.THUMBS UP.

                       THANK YOU!!!

OUTPUT:-