public class Activity0D {
   public static void main(String[] args) {
      String[] phoneNumbers = new String[100];
      int[] callDurations = new int[phoneNumbers.length];
      int size = 0;

      size = addCall(phoneNumbers, callDurations, size, "555-555-5555", 137);
      size = addCall(phoneNumbers, callDurations, size, "555-555-0000", 12);
      size = addCall(phoneNumbers, callDurations, size, "555-555-1234", 28);
      size = addCall(phoneNumbers, callDurations, size, "555-555-9876", 12);
      size = addCall(phoneNumbers, callDurations, size, "555-555-5555", 12);
      size = addCall(phoneNumbers, callDurations, size, "555-555-1234", 26);
      size = addCall(phoneNumbers, callDurations, size, "555-555-1234", 26);
      size = addCall(phoneNumbers, callDurations, size, "555-555-9876", 382);
      size = addCall(phoneNumbers, callDurations, size, "555-555-5555", 382);

      System.out.println("Phone numbers (initially):");
      printList(phoneNumbers, callDurations, size);

      /* Calling totalDurations function */
      totalDurations(phoneNumbers, callDurations, size);

      size = removeCall(phoneNumbers, callDurations, size, 1); // middle
      size = removeCall(phoneNumbers, callDurations, size, size - 1); // last
      size = removeCall(phoneNumbers, callDurations, size, 0); // first

      System.out.println("\nPhone numbers (after):");
      printList(phoneNumbers, callDurations, size);

      size = removeCall(phoneNumbers, callDurations, size, 0);

      System.out.println("\nPhone numbers (none left):");
      printList(phoneNumbers, callDurations, size);

      System.out.println("\nEnd of processing.");
   }

   public static int addCall(String[] phoneNumbers, int[] callDurations, int size, String newNumber, int newDuration) {
      if (size >= phoneNumbers.length) {
         System.out.println("Error adding " + newNumber + ": array capacity exceeded.");
      } else {
         phoneNumbers[size] = newNumber;
         callDurations[size] = newDuration;
         size++;
      }

      return size;
   }

   public static void printList(String[] phoneNumbers, int[] callDurations, int size) {
      for (int i = 0; i < size; i++) {
         System.out.println(phoneNumbers[i] + " duration: " + callDurations[i] + "s");
      }
   }

   public static int find(String[] list, int size, int start, String target) {
      int pos = start;

      while (pos < size && !target.equals(list[pos])) {
         pos++;
      }

      if (pos == size)
         pos = -1;

      return pos;
   }

   public static void findAllCalls(String[] phoneNumbers, int[] callDurations, int size, String targetNumber) {
      int matchPos;

      System.out.println("Calls from " + targetNumber + ":");
      matchPos = find(phoneNumbers, size, 0, targetNumber);
      while (matchPos >= 0) {
         System.out.println(phoneNumbers[matchPos] + " duration: " + callDurations[matchPos] + "s");

         // Find the next match, starting after the last one
         matchPos = find(phoneNumbers, size, matchPos + 1, targetNumber);
      }
   }

   public static int removeCall(String[] phoneNumbers, int[] callDurations, int size, int posToRemove) {
      for (int i = posToRemove + 1; i < size; i++) {
         phoneNumbers[i - 1] = phoneNumbers[i];
         callDurations[i - 1] = callDurations[i];
      }
      size--;

      return size;
   }

   /* Method that finds total duration of each phone call */
   public static void totalDurations(String[] phoneNumbers, int[] callDurations, int size)
   {
       int newSize = 0, pos, i;

       //New parallel arrays
       String[] uPhoneNumbers = new String[size];
       int[] uCallDurations = new int[size];

       //Iterating over old list
       for(i=0; i<size; i++)
       {
           //Identifying position of phone number in new list
           pos = find(uPhoneNumbers, newSize, 0, phoneNumbers[i]);

           //If not found ==> New Entry
           if(pos == -1)
           {
               //Adding to new list
               uPhoneNumbers[newSize] = phoneNumbers[i];
               uCallDurations[newSize] = callDurations[i];

               //Incrementing size
               newSize++;
           }
           else
           {
               //Updating duration
               uCallDurations[pos] = uCallDurations[pos] + callDurations[i];
           }
       }

       //Printing list
       System.out.println("\n Total Durations: \n");
       printList(uPhoneNumbers, uCallDurations, newSize);
       System.out.println("\n\n\n");
   }
}

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Sample Output:

https://d2vlcm61l7u1fs.cloudfront.net/media%2F8d8%2F8d8d6c1a-b2ee-4313-afd0-c5ed11bfc4f2%2Fphpo6teZC.png