Answer:
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);
}
}
Explanation:
See the code above
