How do these two functions work?

Could someone show me how this code works or add some comments to it?
public String populateTreeAsXML() throws ManagementSupportException {
            StringBuffer buffer = new StringBuffer();
            long[] projectIds = this.getProjects();
            for(long id : projectIds) {
                  buffer.append(this.populateTreeAsXML(id)).append("\n");
            }
            return buffer.toString();
      }

      public String populateTreeAsXML(long nodeId) throws ManagementSupportException {
            TEServiceStub.GetProjectTree request = new TEServiceStub.GetProjectTree();

            request.setNodeID(nodeId);

            TEServiceStub.GetProjectTreeResponse response = null;
            try {
                  response = stub.getProjectTree(request);
            } catch (RemoteException e) {
                  logger.warn("Fail to call TEService :" + e);
                  throw new ManagementSupportException("Fail to call TEService :" + e);
            }

            if(!response.getStatus().getSuccess()) {
                  logger.warn("TEService return failure while call saveTestLog()");
                  throw new ManagementSupportException("TEService return failure while call saveTestLog()");
            }

            return response.getOMElement(TEServiceStub.GetProjectTreeResponse.MY_QNAME, OMAbstractFactory.getOMFactory()).toString();
      }
yankeebushsoftwareAsked:
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Mayank SAssociate Director - Product EngineeringCommented:
public String populateTreeAsXML() throws ManagementSupportException {
            StringBuffer buffer = new StringBuffer(); // create a new string buffer
            long[] projectIds = this.getProjects(); // get the project IDs in an array
            for(long id : projectIds) { // iterate through the array
                  // append the ID after populating the tree as XML, followed by new line
                  buffer.append(this.populateTreeAsXML(id)).append("\n");
            }
            // return the string contents
            return buffer.toString();
      }

      public String populateTreeAsXML(long nodeId) throws ManagementSupportException {
            TEServiceStub.GetProjectTree request = new TEServiceStub.GetProjectTree(); // create a new tree or tree node, I guess

            request.setNodeID(nodeId); // set the node ID for the tree or tree node

            TEServiceStub.GetProjectTreeResponse response = null;
            try {
                  // probably invoke a web service or something with the request
                  // and obtain a response
                  response = stub.getProjectTree(request);
            } catch (RemoteException e) {
                  logger.warn("Fail to call TEService :" + e);
                  throw new ManagementSupportException("Fail to call TEService :" + e);
            }

            // if the status is not success, throw an exception
            if(!response.getStatus().getSuccess()) {
                  logger.warn("TEService return failure while call saveTestLog()");
                  throw new ManagementSupportException("TEService return failure while call saveTestLog()");
            }

            return response.getOMElement(TEServiceStub.GetProjectTreeResponse.MY_QNAME, OMAbstractFactory.getOMFactory()).toString(); // return the OM element
      }
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