// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.maps;

import com.google.maps.model.LatLng;
import com.google.maps.model.PlaceType;
import com.google.gson.Gson;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/** Servlet that returns all PlaceTypes from Places API. */
@WebServlet("/places")
public final class PlacesServlet extends HttpServlet {

  private final Gson gson = new Gson();

  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
    ArrayList<String> places = new ArrayList<>();
    for(PlaceType location: PlaceType.values()) {
      String place = formatLocation(location);
      places.add(place);
    }
    response.setContentType("application/json;");
    response.getWriter().println(gson.toJson(places));
  }

  /** 
   * Format string by capitalizing and adding spaces in-between words.
   * @param location is a PlaceType that indicates a type of location/interest.
   * @return is the modified location name.
   */
  private String formatLocation(PlaceType location) {
    place = place.substring(0,1).toUpperCase() + place.substring(1);
    place = place.replace('_', ' ');
    return place;
  }
}

// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.maps;

import com.google.maps.model.LatLng;
import com.google.maps.model.PlaceType;
import com.google.gson.Gson;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/** Servlet that returns all PlaceTypes from Places API. */
@WebServlet("/places")
public final class PlacesServlet extends HttpServlet {

  private final Gson gson = new Gson();

  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
    ArrayList<String> places = new ArrayList<>();
    for(PlaceType location: PlaceType.values()) {
      String place = formatLocation(location);
      places.add(place);
    }
    response.setContentType("application/json;");
    response.getWriter().println(gson.toJson(places));
  }

  /** 
   * Format string by capitalizing and adding spaces in-between words.
   * @param location is a PlaceType that indicates a type of location/interest.
   * @return is the modified location name.
   */
  private String formatLocation(PlaceType location) {
    String place = location.toString();
    place = place.substring(0,1).toUpperCase() + place.substring(1);
    place = place.replace('_', ' ');
    return place;
  }
}

Fix variable reference issues