Question

Write a public static method called getPIDs that has a parameter of type Map called nameToPID (keys are student names and values are student PIDs). It should return a HashSet containing all PIDs in nameToPID.

Answer 1

Answer:

Java program is explained below

Explanation:

import java.util.HashSet;

import java.util.Map;

import java.util.TreeMap;

public class TruckRace1 {

   public static HashSet<String> getPIDs (Map<String,String>nameToPID ){

       HashSet<String> pidSet = new HashSet<>();

       for(String ids: nameToPID.values()){

           pidSet.add(ids);

       }

       return pidSet;

   }

   public static void main(String[] args) {

       Map<String,String> pids = new TreeMap<>();

       pids.put("John","123");

       pids.put("Jason","124");

       pids.put("Peter","125");

       pids.put("Alice","126");

       pids.put("Peny","129");

       HashSet<String> ids = getPIDs(pids);

       for(String id:ids){

           System.out.println(id);

       }

   }

}