Discussion of Activity 5.3 - Completing the coding of the LinkingInfo class

Here is our sample solution for the class LinkingInfo:

import java.util.ArrayList;
 
public class LinkingInfo
{
   private String computer;
   private ArrayList linkedComputers;

   public LinkingInfo(String computerName, int capacity)
   {
      linkedComputers = new ArrayList(capacity);
      computer = computerName;
   }

   public LinkingInfo(String computerName)
   {
      linkedComputers = new ArrayList();
      computer = computerName;
   }

   public String getComputerName()
   {
      return computer;
   }

   public int getNumberOfLinks()
   {
      return linkedComputers.size();
   }
 
   public boolean isLinked(String comp1)
   {
      return linkedComputers.contains(comp1);
   }

   public void addComputer(String comp1)
      throws ComputerErrorException
   {
      if (!this.isLinked(comp1))
      {
         linkedComputers.add(comp1);
      }
      else
      {
         throw new ComputerErrorException("Computer " + comp1 + " already in links.");
      }
   }

   public void removeComputer(String comp1)
      throws ComputerErrorException
   {
      if (this.isLinked(comp1))
      {
         linkedComputers.remove(comp1);
      }
      else
      {
         throw new ComputerErrorException("Computer " + comp1 + " not in links.");
      }
   }

   public void listLinkedComputers()
   // Method to print a list of linked computers.
   {
      System.out.println("Computers linked to node " + this.getComputerName() + ":");
      for (int i = 0; i < this.getNumberOfLinks(); i++)
      {
         System.out.println(linkedComputers.get(i));
      }
      System.out.println("End of list.");
      System.out.println();
   }
}