Display a map

Learn how to create and display a map with a basemap layer.

display a map

A map contains layers of geographic data. A map contains a basemap layer and, optionally, one or more data layers. You can display a specific area of a map by using a map view and setting the location and zoom level.

In this tutorial, you create and display a map of the Santa Monica Mountains in California using the topographic basemap layer.

The map and code will be used as the starting point for other 2D tutorials.

Prerequisites

The following are required for this tutorial:

  1. An ArcGIS account to access your API keys. If you don't have an account, sign up for free.
  2. Confirm that your system meets the minimum system requirements.
  3. An IDE for Java.

Steps

Create a new Java project with Gradle

  1. Open IntelliJ IDEA.

    • In the menu bar, click File > New > Project.

    • In the New Project window, select Gradle from the list on the left and click Next.

    • In the next window, enter a name for your new project and choose a location to save it.

  2. In the project, replace the contents of the build.gradle file with the following script to configure your app and reference the API. Make sure that you import the Gradle changes once you have replaced the contents.

    build.gradle
    Change lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange lineChange line
                                                        
    plugins {
        id 'application'
        id 'org.openjfx.javafxplugin' version '0.0.8'
    }
    
    ext {
        arcgisVersion = '100.10.0'
    }
    
    javafx {
        version = "11.0.2"
        modules = [ 'javafx.controls', 'javafx.fxml', 'javafx.web', 'javafx.media' ]
    }
    
    compileJava.options.encoding = 'UTF-8'
    
    repositories {
        jcenter()
        maven {
            url 'https://esri.jfrog.io/artifactory/arcgis'
        }
    }
    
    configurations {
        natives
    }
    
    dependencies {
        implementation "com.esri.arcgisruntime:arcgis-java:$arcgisVersion"
        natives "com.esri.arcgisruntime:arcgis-java-jnilibs:$arcgisVersion"
        natives "com.esri.arcgisruntime:arcgis-java-resources:$arcgisVersion"
    }
    
    task copyNatives(type: Copy) {
        description = "Copies the arcgis native libraries into the " +
                "project build directory for development."
        group = "build"
        configurations.natives.asFileTree.each {
            from(zipTree(it))
        }
        // store native libraries in a common location shared with other samples
        into "${System.properties.getProperty("user.home")}/.arcgis/$arcgisVersion"
    }
    
    run {
        dependsOn copyNatives
        mainClassName = 'com.example.app.App'
    }
    
    wrapper {
        gradleVersion = '6.5.1'
    }
    
  3. Click View > Tool Windows > Gradle to open the Gradle view, then in Tasks > build, double-click copyNatives. This unpacks the native library dependencies to $USER_HOME/.arcgis.

    You can also run Gradle tasks via the command line. Consult Gradle's documentation to learn how this is done.

  4. In the Project tool window, under src/main, right-click the Java folder, and click New > Package.

  5. Name the package com.example.app.

  6. Right-click this package and click New > Java class.

  7. Name the class App.java.

Add import statements

In App.Java, add import statements to reference the ArcGIS Runtime API and JavaFX classes.

App.java
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//   Copyright 2020 Esri
//   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
//
//   http://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.example.app;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.MapView;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class App extends Application {

  private MapView mapView;

  public static void main(String[] args) {
    Application.launch(args);
  }

  @Override
  public void start(Stage stage) {

    // set the title and size of the stage and show it
    stage.setTitle("Display a map tutorial");
    stage.setWidth(800);
    stage.setHeight(700);
    stage.show();

    // create a JavaFX scene with a stack pane as the root node, and add it to the scene
    StackPane stackPane = new StackPane();
    Scene scene = new Scene(stackPane);

    stage.setScene(scene);

    // Note: it is not best practice to store API keys in source code.
    // The API key is referenced here for the convenience of this tutorial.
    String yourApiKey = "YOUR_API_KEY";
    ArcGISRuntimeEnvironment.setApiKey(yourApiKey);

    // create a map view to display the map and add it to the stack pane
    mapView = new MapView();
    stackPane.getChildren().add(mapView);

    ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);

    // set the map on the map view
    mapView.setMap(map);

    mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 144447.638572));

  }

  /**
   * Stops and releases all resources used in application.
   */
  @Override
  public void stop() {
    if (mapView != null) {
      mapView.dispose();
    }
  }

}

Add a UI for the map view

A map view is a UI component that displays a map. It also handles user interactions with the map. Use JavaFX to add a map view to the UI.

  1. In App.Java, create a new public class named App that extends the JavaFX Application class.

    • Add a member variable for a MapView and a main() method. The main() method constructs an instance of the Application on the JavaFX Application Thread.

      The mapView member variable allows you to easily reference your MapView from other parts of the application.

    • In the start() method, configure the JavaFX Stage with a title and dimensions, and then show it.

      Note that the start method is abstract and must be overridden. It takes a single parameter of the JavaFX type Stage.

    • Create a JavaFX StackPane, and use it to create a JavaFX Scene. Then set the scene on the stage.

      App.java
      Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.
      27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 51 52 52 52 52 52 52 52 52 52 52 52 53
      
      //   Copyright 2020 Esri
      //   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
      //
      //   http://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.example.app;
      
      import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
      import com.esri.arcgisruntime.mapping.ArcGISMap;
      import com.esri.arcgisruntime.mapping.BasemapStyle;
      import com.esri.arcgisruntime.mapping.Viewpoint;
      import com.esri.arcgisruntime.mapping.view.MapView;
      
      import javafx.application.Application;
      import javafx.scene.Scene;
      import javafx.scene.layout.StackPane;
      import javafx.stage.Stage;
      
      public class App extends Application {
      
        private MapView mapView;
      
        public static void main(String[] args) {
          Application.launch(args);
        }
      
        @Override
        public void start(Stage stage) {
      
          // set the title and size of the stage and show it
          stage.setTitle("Display a map tutorial");
          stage.setWidth(800);
          stage.setHeight(700);
          stage.show();
      
          // create a JavaFX scene with a stack pane as the root node, and add it to the scene
          StackPane stackPane = new StackPane();
          Scene scene = new Scene(stackPane);
      
          stage.setScene(scene);
      
          // Note: it is not best practice to store API keys in source code.
          // The API key is referenced here for the convenience of this tutorial.
          String yourApiKey = "YOUR_API_KEY";
          ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
      
          // create a map view to display the map and add it to the stack pane
          mapView = new MapView();
          stackPane.getChildren().add(mapView);
      
          ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
      
          // set the map on the map view
          mapView.setMap(map);
      
          mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 144447.638572));
      
        }
      
        /**
         * Stops and releases all resources used in application.
         */
        @Override
        public void stop() {
          if (mapView != null) {
            mapView.dispose();
          }
        }
      
      }
      
  2. Add the mapView to the UI.

    App.java
    Add line.Add line.Add line.
    44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 45 46 47 48 49 50 50 50 50 50 50 51 52 53 53 52 51 50 49 48 47 46 46 46 45 44 43 42 41 40 39 38 37 36 36
    
    //   Copyright 2020 Esri
    //   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
    //
    //   http://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.example.app;
    
    import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
    import com.esri.arcgisruntime.mapping.ArcGISMap;
    import com.esri.arcgisruntime.mapping.BasemapStyle;
    import com.esri.arcgisruntime.mapping.Viewpoint;
    import com.esri.arcgisruntime.mapping.view.MapView;
    
    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.layout.StackPane;
    import javafx.stage.Stage;
    
    public class App extends Application {
    
      private MapView mapView;
    
      public static void main(String[] args) {
        Application.launch(args);
      }
    
      @Override
      public void start(Stage stage) {
    
        // set the title and size of the stage and show it
        stage.setTitle("Display a map tutorial");
        stage.setWidth(800);
        stage.setHeight(700);
        stage.show();
    
        // create a JavaFX scene with a stack pane as the root node, and add it to the scene
        StackPane stackPane = new StackPane();
        Scene scene = new Scene(stackPane);
    
        stage.setScene(scene);
    
        // Note: it is not best practice to store API keys in source code.
        // The API key is referenced here for the convenience of this tutorial.
        String yourApiKey = "YOUR_API_KEY";
        ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
    
        // create a map view to display the map and add it to the stack pane
        mapView = new MapView();
        stackPane.getChildren().add(mapView);
    
        ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
    
        // set the map on the map view
        mapView.setMap(map);
    
        mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 144447.638572));
    
      }
    
      /**
       * Stops and releases all resources used in application.
       */
      @Override
      public void stop() {
        if (mapView != null) {
          mapView.dispose();
        }
      }
    
    }
    

Add a map

Use the map view to display a map centered on the Santa Monica Mountains in California. The map will contain a topographic basemap layer.

  1. Create a new ArcGISMap with a topographic basemap style.

    App.java
    Add line.
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    //   Copyright 2020 Esri
    //   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
    //
    //   http://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.example.app;
    
    import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
    import com.esri.arcgisruntime.mapping.ArcGISMap;
    import com.esri.arcgisruntime.mapping.BasemapStyle;
    import com.esri.arcgisruntime.mapping.Viewpoint;
    import com.esri.arcgisruntime.mapping.view.MapView;
    
    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.layout.StackPane;
    import javafx.stage.Stage;
    
    public class App extends Application {
    
      private MapView mapView;
    
      public static void main(String[] args) {
        Application.launch(args);
      }
    
      @Override
      public void start(Stage stage) {
    
        // set the title and size of the stage and show it
        stage.setTitle("Display a map tutorial");
        stage.setWidth(800);
        stage.setHeight(700);
        stage.show();
    
        // create a JavaFX scene with a stack pane as the root node, and add it to the scene
        StackPane stackPane = new StackPane();
        Scene scene = new Scene(stackPane);
    
        stage.setScene(scene);
    
        // Note: it is not best practice to store API keys in source code.
        // The API key is referenced here for the convenience of this tutorial.
        String yourApiKey = "YOUR_API_KEY";
        ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
    
        // create a map view to display the map and add it to the stack pane
        mapView = new MapView();
        stackPane.getChildren().add(mapView);
    
        ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
    
        // set the map on the map view
        mapView.setMap(map);
    
        mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 144447.638572));
    
      }
    
      /**
       * Stops and releases all resources used in application.
       */
      @Override
      public void stop() {
        if (mapView != null) {
          mapView.dispose();
        }
      }
    
    }
    
  2. To display the map in the map view, call the mapView's setMap() method, passing the newly created ArcGISMap as a parameter.

    App.java
    Add line.Add line.
    59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 58 57 56 55 54 54 54 54 54 55 56 57 58 59 59 58 58 58 57 56 55 54 53 52 51 50 49 48 48
    
    //   Copyright 2020 Esri
    //   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
    //
    //   http://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.example.app;
    
    import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
    import com.esri.arcgisruntime.mapping.ArcGISMap;
    import com.esri.arcgisruntime.mapping.BasemapStyle;
    import com.esri.arcgisruntime.mapping.Viewpoint;
    import com.esri.arcgisruntime.mapping.view.MapView;
    
    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.layout.StackPane;
    import javafx.stage.Stage;
    
    public class App extends Application {
    
      private MapView mapView;
    
      public static void main(String[] args) {
        Application.launch(args);
      }
    
      @Override
      public void start(Stage stage) {
    
        // set the title and size of the stage and show it
        stage.setTitle("Display a map tutorial");
        stage.setWidth(800);
        stage.setHeight(700);
        stage.show();
    
        // create a JavaFX scene with a stack pane as the root node, and add it to the scene
        StackPane stackPane = new StackPane();
        Scene scene = new Scene(stackPane);
    
        stage.setScene(scene);
    
        // Note: it is not best practice to store API keys in source code.
        // The API key is referenced here for the convenience of this tutorial.
        String yourApiKey = "YOUR_API_KEY";
        ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
    
        // create a map view to display the map and add it to the stack pane
        mapView = new MapView();
        stackPane.getChildren().add(mapView);
    
        ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
    
        // set the map on the map view
        mapView.setMap(map);
    
        mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 144447.638572));
    
      }
    
      /**
       * Stops and releases all resources used in application.
       */
      @Override
      public void stop() {
        if (mapView != null) {
          mapView.dispose();
        }
      }
    
    }
    
  3. Center the mapView at a specific point and scale on the Earth by setting a Viewpoint to it.

    • Provide latitude and longitude coordinates, and a scale value as parameters to a new Viewpoint, and set it to the mapView with setViewpoint().

    The Viewpoint constructor used in this tutorial takes a scale parameter. The scale value 144447.638572 is converted from zoom level 12. Zoom levels are often used as a shorthand for predetermined scale values in Web Mercator maps. Learn more in Zoom levels and scale.

    App.java
    Add line.
    59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 58 57 56 55 54 54 54 54 54 55 56 57 58 59 60 60 60 60 59 58 57 56 55 54 53 52 51 50 50
    
    //   Copyright 2020 Esri
    //   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
    //
    //   http://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.example.app;
    
    import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
    import com.esri.arcgisruntime.mapping.ArcGISMap;
    import com.esri.arcgisruntime.mapping.BasemapStyle;
    import com.esri.arcgisruntime.mapping.Viewpoint;
    import com.esri.arcgisruntime.mapping.view.MapView;
    
    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.layout.StackPane;
    import javafx.stage.Stage;
    
    public class App extends Application {
    
      private MapView mapView;
    
      public static void main(String[] args) {
        Application.launch(args);
      }
    
      @Override
      public void start(Stage stage) {
    
        // set the title and size of the stage and show it
        stage.setTitle("Display a map tutorial");
        stage.setWidth(800);
        stage.setHeight(700);
        stage.show();
    
        // create a JavaFX scene with a stack pane as the root node, and add it to the scene
        StackPane stackPane = new StackPane();
        Scene scene = new Scene(stackPane);
    
        stage.setScene(scene);
    
        // Note: it is not best practice to store API keys in source code.
        // The API key is referenced here for the convenience of this tutorial.
        String yourApiKey = "YOUR_API_KEY";
        ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
    
        // create a map view to display the map and add it to the stack pane
        mapView = new MapView();
        stackPane.getChildren().add(mapView);
    
        ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
    
        // set the map on the map view
        mapView.setMap(map);
    
        mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 144447.638572));
    
      }
    
      /**
       * Stops and releases all resources used in application.
       */
      @Override
      public void stop() {
        if (mapView != null) {
          mapView.dispose();
        }
      }
    
    }
    

Set your API key

An API key is required to enable access to services, web maps, and web scenes hosted in ArcGIS Online.

If you haven't already, go to your developer dashboard to get your API key. For these tutorials, use your default API key. It is scoped to include all of the services demonstrated in the tutorials.

  1. Before running the ArcGIS Java API code, set the API key property on the ArcGISRuntimeEnvironment with your API key.

    App.java
    Add line.Add line.Add line.Add line.
    48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 49 50 51 52 53 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54 54
    
    //   Copyright 2020 Esri
    //   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
    //
    //   http://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.example.app;
    
    import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
    import com.esri.arcgisruntime.mapping.ArcGISMap;
    import com.esri.arcgisruntime.mapping.BasemapStyle;
    import com.esri.arcgisruntime.mapping.Viewpoint;
    import com.esri.arcgisruntime.mapping.view.MapView;
    
    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.layout.StackPane;
    import javafx.stage.Stage;
    
    public class App extends Application {
    
      private MapView mapView;
    
      public static void main(String[] args) {
        Application.launch(args);
      }
    
      @Override
      public void start(Stage stage) {
    
        // set the title and size of the stage and show it
        stage.setTitle("Display a map tutorial");
        stage.setWidth(800);
        stage.setHeight(700);
        stage.show();
    
        // create a JavaFX scene with a stack pane as the root node, and add it to the scene
        StackPane stackPane = new StackPane();
        Scene scene = new Scene(stackPane);
    
        stage.setScene(scene);
    
        // Note: it is not best practice to store API keys in source code.
        // The API key is referenced here for the convenience of this tutorial.
        String yourApiKey = "YOUR_API_KEY";
        ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
    
        // create a map view to display the map and add it to the stack pane
        mapView = new MapView();
        stackPane.getChildren().add(mapView);
    
        ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
    
        // set the map on the map view
        mapView.setMap(map);
    
        mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 144447.638572));
    
      }
    
      /**
       * Stops and releases all resources used in application.
       */
      @Override
      public void stop() {
        if (mapView != null) {
          mapView.dispose();
        }
      }
    
    }
    
  2. Run the app. Ensure to run the app as a Gradle task and not as an application in your IDE. In the Gradle tool window, under Tasks > application, click run.

You should see a map with the topographic basemap layer centered on the Santa Monica Mountains in California. Click, drag, and scroll the mouse wheel on the map view to explore the map.

Stop the app

To ensure that ArcGIS Runtime API resources used in the application are released when it is closed, override the JavaFX stop method and call dispose() on the mapView:

App.java
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//   Copyright 2020 Esri
//   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
//
//   http://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.example.app;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.MapView;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class App extends Application {

  private MapView mapView;

  public static void main(String[] args) {
    Application.launch(args);
  }

  @Override
  public void start(Stage stage) {

    // set the title and size of the stage and show it
    stage.setTitle("Display a map tutorial");
    stage.setWidth(800);
    stage.setHeight(700);
    stage.show();

    // create a JavaFX scene with a stack pane as the root node, and add it to the scene
    StackPane stackPane = new StackPane();
    Scene scene = new Scene(stackPane);

    stage.setScene(scene);

    // Note: it is not best practice to store API keys in source code.
    // The API key is referenced here for the convenience of this tutorial.
    String yourApiKey = "YOUR_API_KEY";
    ArcGISRuntimeEnvironment.setApiKey(yourApiKey);

    // create a map view to display the map and add it to the stack pane
    mapView = new MapView();
    stackPane.getChildren().add(mapView);

    ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);

    // set the map on the map view
    mapView.setMap(map);

    mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 144447.638572));

  }

  /**
   * Stops and releases all resources used in application.
   */
  @Override
  public void stop() {
    if (mapView != null) {
      mapView.dispose();
    }
  }

}

What's next?

Learn how to use additional API features, ArcGIS platform services, and ArcGIS tools in these tutorials: