Tutorial by Examples: p

String getText(String url) throws IOException { HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection(); //add headers to the connection, or check the status if desired.. // handle error response code it occurs int responseCode = conn.getResponseCod...

One use of SharedPreferences is to implement a "Settings" screen in your app, where the user can set their preferences / options. Like this: A PreferenceScreen saves user preferences in SharedPreferences. To create a PreferenceScreen, you need a few things: An XML file to define the av...

Scanner scanner = new Scanner(System.in); //Scanner obj to read System input String inputTaken = new String(); while (true) { String input = scanner.nextLine(); // reading one line of input if (input.matches("\\s+")) // if it matches spaces/tabs, stop reading b...

Scanner scanner = null; try { scanner = new Scanner(new File("Names.txt")); while (scanner.hasNext()) { System.out.println(scanner.nextLine()); } } catch (Exception e) { System.err.println("Exception occurred!"); } finally { if (scanner != nul...

Needed imports: import javax.sound.sampled.AudioSystem; import javax.sound.sampled.Clip; This code will create a clip and play it continuously once started: Clip clip = AudioSystem.getClip(); clip.open(AudioSystem.getAudioInputStream(new URL(filename))); clip.start(); clip.loop(Clip.LOOP_CO...

Paginations in JavaFX use a callback to get the pages used in the animation. Pagination p = new Pagination(); p.setPageFactory(param -> new Button(param.toString())); This creates an infinite list of buttons numbed 0.. since the zero arg constructor creates an infinite pagination. setPageFac...

ArrayList<String> images = new ArrayList<>(); images.add("some\\cool\\image"); images.add("some\\other\\cool\\image"); images.add("some\\cooler\\image"); Pagination p = new Pagination(3); p.setPageFactory(n -> new ImageView(images.get(n))); Note...

MIDI files can be played by using several classes from the javax.sound.midi package. A Sequencer performs playback of the MIDI file, and many of its methods can be used to set playback controls such as loop count, tempo, track muting, and others. General playback of MIDI data can be done in this wa...

In your build.gradle file of main module(app), define your minimum and target version number. android { //the version of sdk source used to compile your project compileSdkVersion 23 defaultConfig { //the minimum sdk version required by device to run your app minSd...

A simple example of producer-consumer problem solution. Notice that JDK classes (AtomicBoolean and BlockingQueue) are used for synchronization, which reduces the chance of creating an invalid solution. Consult Javadoc for various types of BlockingQueue; choosing different implementation may drastica...

First of all for a JAX-RS application must be set a base URI from which all the resources will be available. For that purpose the javax.ws.rs.core.Application class must be extended and annotated with the javax.ws.rs.ApplicationPath annotation. The annotation accepts a string argument which defines...

Calendar, Date, and LocalDate Java SE 8 before, after, compareTo and equals methods //Use of Calendar and Date objects final Date today = new Date(); final Calendar calendar = Calendar.getInstance(); calendar.set(1990, Calendar.NOVEMBER, 1, 0, 0, 0); Date birthdate = calendar.getTime(); ...

When desired XML format differs from Java object model, an XmlAdapter implementation can be used to transform model object into xml-format object and vice versa. This example demonstrates how to put a field's value into an attribute of an element with field's name. public class XmlAdapterExample { ...

// Required imports import javax.script.ScriptEngineManager; import javax.script.ScriptEngine; import javax.script.ScriptException; import java.io.FileReader; import java.io.FileNotFoundException; // Obtain an instance of the JavaScript engine ScriptEngineManager manager = new ScriptEngineM...

// Obtain an instance of JavaScript engine ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine engine = manager.getEngineByName("nashorn"); // Setup a custom writer StringWriter stringWriter = new StringWriter(); // Modify the engine context so that the custom writ...

A char can store a single 16-bit Unicode character. A character literal is enclosed in single quotes char myChar = 'u'; char myChar2 = '5'; char myChar3 = 65; // myChar3 == 'A' It has a minimum value of \u0000 (0 in the decimal representation, also called the null character) and a maximum valu...

This Activity code will provide basic functionality for including a Google Map using a SupportMapFragment. The Google Maps V2 API includes an all-new way to load maps. Activities now have to implement the OnMapReadyCallBack interface, which comes with a onMapReady() method override that is execute...

Map Style Google Maps come with a set of different styles to be applied, using this code : // Sets the map type to be "hybrid" map.setMapType(GoogleMap.MAP_TYPE_HYBRID); The different map styles are : Normal map.setMapType(GoogleMap.MAP_TYPE_NORMAL); Typical road map. Roads, s...

To add markers to a Google Map, for example from an ArrayList of MyLocation Objects, we can do it this way. The MyLocation holder class: public class MyLocation { LatLng latLng; String title; String snippet; } Here is a method that would take a list of MyLocation Objects and place a M...

You should be careful when comparing floating-point values (float or double) using relational operators: ==, !=, < and so on. These operators give results according to the binary representations of the floating point values. For example: public class CompareTest { public static void main...