Example usage for java.lang String isEmpty

Introduction

In this page you can find the example usage for java.lang String isEmpty.

Prototype

public boolean isEmpty() 

Source Link

Document

Returns true if, and only if, #length() is 0 .

Usage

From source file:StringDemo.java

public static void main(String[] args) {
    String myString = "";
    if (myString.isEmpty()) {
        System.out.println("Empty");
    } else {/*from  w  ww .  jav a  2s .  co m*/
        System.out.println("Not empty");
    }
}

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From source file:com.skynetcomputing.skynettools.Main.java

/**
 * @param args the command line arguments
 *///from ww  w. j  ava 2  s. c  om
public static void main(String[] args) throws IOException {
    Scanner s = new Scanner(System.in);
    boolean isRunning = true;
    while (isRunning) {
        System.out.println("Enter file path for MD5 hash. Leave empty to quit");
        String input = s.nextLine();
        isRunning = !input.isEmpty();
        if (isRunning) {
            File inputFile = new File(input);
            if (inputFile.length() > 0) {
                try (FileInputStream fis = new FileInputStream(inputFile)) {
                    String md5 = org.apache.commons.codec.digest.DigestUtils.md5Hex(fis);
                    System.out.println("MD5: " + md5);
                }
            }
        }
    }

}

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From source file:web.ui.WebApplication.java

public static void main(String[] args) throws Exception {
    String webPort = System.getenv("PORT");
    if (webPort == null || webPort.isEmpty()) {
        webPort = "8080";
    }/*from  w w  w  . j a v  a 2 s  .co  m*/
    System.setProperty("server.port", webPort);
    SpringApplication.run(WebApplication.class, args);
}

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From source file:example.ToCommonsEmpty.java

public static void main(String[] args) {
    String s = "";

    boolean a = s == null || s.length() == 0;
    boolean b = s == null || s.isEmpty();
    boolean c = s != null && s.isEmpty();
    boolean d = s != null && s.length() == 0;
}

---

From source file:Main.java

public static void main(String[] args) {
    String str1 = "Hello";
    String str2 = "";

    // Using the isEmpty() method
    boolean empty1 = str1.isEmpty(); // Assigns false to empty1
    boolean empty2 = str2.isEmpty(); // Assigns true to empty1

    // Using the equals() method
    boolean empty3 = "".equals(str1); // Assigns false to empty3
    boolean empty4 = "".equals(str2); // Assigns true to empty4

    // Comparing length of the string with 0
    boolean empty5 = str1.length() == 0; // Assigns false to empty5
    boolean empty6 = str2.length() == 0; // Assigns true to empty6

}

---

From source file:cc.vidr.datum.tools.Console.java

public static void main(String[] args) throws IOException {
    System.out.print("Warming up... ");
    System.out.flush();/* w  w  w .  ja  v a  2 s.co  m*/
    QA.query("");
    System.out.println("Ready.");
    System.out.println("Ask me a question. Leave a blank line to exit.");
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    while (true) {
        int numServers = Server.getNumServers();
        int numFacts = Server.getNumFacts();
        System.out.print("> ");
        String q = in.readLine();
        if (q == null || q.isEmpty()) {
            System.out.println("Bye.");
            break;
        }
        Literal[] facts;
        if (q.startsWith("?-")) {
            try {
                Program program = new Program(q.substring(2));
                Clause[] query = program.parse();
                facts = Server.query(query[0].getHead());
            } catch (RecognitionException e) {
                facts = new Literal[0];
            }
        } else {
            facts = QA.query(q);
        }
        for (Literal fact : facts)
            printFact(fact, 0);
        if (facts.length == 0)
            System.out.println("I don't know.");
        if (DEBUG) {
            System.err.println((Server.getNumServers() - numServers) + " servers spawned");
            System.err.println((Server.getNumFacts() - numFacts) + " facts retrieved/generated");
        }
    }
}

---

From source file:com.asual.lesscss.LessEngineCli.java

public static void main(String[] args) throws LessException, URISyntaxException {
    Options cmdOptions = new Options();
    cmdOptions.addOption(LessOptions.CHARSET_OPTION, true, "Input file charset encoding. Defaults to UTF-8.");
    cmdOptions.addOption(LessOptions.COMPRESS_OPTION, false, "Flag that enables compressed CSS output.");
    cmdOptions.addOption(LessOptions.CSS_OPTION, false, "Flag that enables compilation of .css files.");
    cmdOptions.addOption(LessOptions.LESS_OPTION, true, "Path to a custom less.js for Rhino version.");
    try {/*ww  w.j a va2s  .  co  m*/
        CommandLineParser cmdParser = new GnuParser();
        CommandLine cmdLine = cmdParser.parse(cmdOptions, args);
        LessOptions options = new LessOptions();
        if (cmdLine.hasOption(LessOptions.CHARSET_OPTION)) {
            options.setCharset(cmdLine.getOptionValue(LessOptions.CHARSET_OPTION));
        }
        if (cmdLine.hasOption(LessOptions.COMPRESS_OPTION)) {
            options.setCompress(true);
        }
        if (cmdLine.hasOption(LessOptions.CSS_OPTION)) {
            options.setCss(true);
        }
        if (cmdLine.hasOption(LessOptions.LESS_OPTION)) {
            options.setLess(new File(cmdLine.getOptionValue(LessOptions.LESS_OPTION)).toURI().toURL());
        }
        LessEngine engine = new LessEngine(options);
        if (System.in.available() != 0) {
            BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
            StringWriter sw = new StringWriter();
            char[] buffer = new char[1024];
            int n = 0;
            while (-1 != (n = in.read(buffer))) {
                sw.write(buffer, 0, n);
            }
            String src = sw.toString();
            if (!src.isEmpty()) {
                System.out.println(engine.compile(src, null, options.isCompress()));
                System.exit(0);
            }
        }
        String[] files = cmdLine.getArgs();
        if (files.length == 1) {
            System.out.println(engine.compile(new File(files[0]), options.isCompress()));
            System.exit(0);
        }
        if (files.length == 2) {
            engine.compile(new File(files[0]), new File(files[1]), options.isCompress());
            System.exit(0);
        }

    } catch (IOException ioe) {
        System.err.println("Error opening input file.");
    } catch (ParseException pe) {
        System.err.println("Error parsing arguments.");
    }
    String[] paths = LessEngine.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath()
            .split(File.separator);
    HelpFormatter formatter = new HelpFormatter();
    formatter.printHelp("java -jar " + paths[paths.length - 1] + " input [output] [options]", cmdOptions);
    System.exit(1);
}

---

From source file:com.floragunn.searchguard.tools.Hasher.java

public static void main(final String[] args) {

    final Options options = new Options();
    final HelpFormatter formatter = new HelpFormatter();
    options.addOption(//from  www.j  av a  2  s.  c  om
            Option.builder("p").argName("password").hasArg().desc("Cleartext password to hash").build());
    options.addOption(Option.builder("env").argName("name environment variable").hasArg()
            .desc("name environment variable to read password from").build());

    final CommandLineParser parser = new DefaultParser();
    try {
        final CommandLine line = parser.parse(options, args);

        if (line.hasOption("p")) {
            System.out.println(hash(line.getOptionValue("p").getBytes("UTF-8")));
        } else if (line.hasOption("env")) {
            final String pwd = System.getenv(line.getOptionValue("env"));
            if (pwd == null || pwd.isEmpty()) {
                throw new Exception("No environment variable '" + line.getOptionValue("env") + "' set");
            }
            System.out.println(hash(pwd.getBytes("UTF-8")));
        } else {
            final Console console = System.console();
            if (console == null) {
                throw new Exception("Cannot allocate a console");
            }
            final char[] passwd = console.readPassword("[%s]", "Password:");
            System.out.println(hash(new String(passwd).getBytes("UTF-8")));
        }
    } catch (final Exception exp) {
        System.err.println("Parsing failed.  Reason: " + exp.getMessage());
        formatter.printHelp("hasher.sh", options, true);
        System.exit(-1);
    }
}

---

From source file:edu.mit.fss.tutorial.part4.ElementGUI.java

/**
 * The main method./* ww w . ja  va 2  s .  c  o m*/
 *
 * @param args the arguments
 * @throws RTIexception the RTI exception
 */
public static void main(String[] args) throws RTIexception {
    // Configure the logger and set it to display info messages.
    BasicConfigurator.configure();
    logger.setLevel(Level.INFO);

    // Use an input dialog to request the element's name.
    String name = null;
    while (name == null || name.isEmpty()) {
        name = JOptionPane.showInputDialog("Enter element name:");
    }

    // Create a MobileElement object instance. The "final" keyword allows 
    // it to be referenced in the GUI thread below.
    final MobileElement element = new MobileElement(name, new Vector3D(0, 0, 0));

    // Create an OnlineTutorialFederate object instance. The "final" 
    // keyword allows it to be referenced in the GUI thread below.
    final OnlineTutorialFederate fed = new OnlineTutorialFederate(element);

    // Create the graphical user interface using the Event Dispatch Thread.
    try {
        SwingUtilities.invokeAndWait(new Runnable() {
            @Override
            public void run() {
                // Create a new ControlPanel object instance.
                ControlPanel controlPanel = new ControlPanel();

                // Bind it to the element above.
                controlPanel.setBoundElement(element);

                // Add the control panel as an object change listener.
                fed.addObjectChangeListener(controlPanel);

                // Create a new frame to display the panel. Add the panel
                // as the content, pack it, and make it visible.
                JFrame frame = new JFrame();
                frame.setContentPane(controlPanel);
                frame.pack();
                frame.setVisible(true);

                // Add a new WindowAdapter object instance to exit the
                // federate when the window is closing.
                frame.addWindowListener(new WindowAdapter() {
                    @Override
                    public void windowClosing(WindowEvent e) {
                        fed.exit();
                    }
                });
            }
        });
    } catch (InvocationTargetException | InterruptedException e) {
        logger.error(e);
    }

    // Execute the federate.
    fed.execute(0, Long.MAX_VALUE, 1000);
}

---

From source file:com.example.main.Main.java

/**
 * @param args/*from w w w . j a va2 s . c  o m*/
 */
public static void main(String[] args) throws Exception {
    String webappDirLocation = "src/main/webapp/";

    // The port that we should run on can be set into an environment variable
    // Look for that variable and default to 8080 if it isn't there.
    String webPort = System.getenv("PORT");
    if (webPort == null || webPort.isEmpty()) {
        webPort = "8082";
    }

    Server server = new Server(Integer.valueOf(webPort));
    WebAppContext root = new WebAppContext();

    root.setContextPath("/");
    root.setDescriptor(webappDirLocation + "/WEB-INF/web.xml");
    root.setResourceBase(webappDirLocation);

    PersistenceManager.getInstance().getEntityManagerFactory();

    // Parent loader priority is a class loader setting that Jetty accepts.
    // By default Jetty will behave like most web containers in that it will
    // allow your application to replace non-server libraries that are part of the
    // container. Setting parent loader priority to true changes this behavior.
    // Read more here: http://wiki.eclipse.org/Jetty/Reference/Jetty_Classloading
    root.setParentLoaderPriority(true);

    try {
        JSONObject datos = new JSONObject();
        datos.put("nombrePagina", "Competencias");
        datos.put("urlPagina", "localHost:8082");
        JSONObject datos2 = new JSONObject();
        datos2.put("nombrePagina", "Competencias");
        datos2.put("nuevoEstado", "Activo");
        JSONObject datos3 = new JSONObject();
        datos3.put("nombrePagina", "Competencias");
        datos3.put("nombreServicio", "Competencias");
        datos3.put("rutaServicio", "Competencias");
        JSONObject datos4 = new JSONObject();
        datos4.put("nombrePagina", "Competencias");
        datos4.put("nombreServicio", "Ganadores");
        datos4.put("rutaServicio", "Competencias/winners/{name}");

        Client client = Client.create();
        WebResource target = client.resource(SERVIDOR_ZK + "inscribirPagina");
        target.post(JSONObject.class, datos);
        target = client.resource(SERVIDOR_ZK + "estadoPagina");
        target.post(JSONObject.class, datos2);
        target = client.resource(SERVIDOR_ZK + "servicioPagina");
        target.post(JSONObject.class, datos3);
        target = client.resource(SERVIDOR_ZK + "servicioPagina");
        target.post(JSONObject.class, datos4);

        client.destroy();

    } catch (Exception e) {
        e.printStackTrace();
    }

    server.setHandler(root);

    server.start();
    server.join();
}

---

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