Example usage for java.util HashSet add

Introduction

In this page you can find the example usage for java.util HashSet add.

Prototype

public boolean add(E e) 

Source Link

Document

Adds the specified element to this set if it is not already present.

Usage

From source file:Main.java

public static void main(String args[]) {
    HashSet<String> newset = new HashSet<String>();

    // populate hash set
    newset.add("Learning");
    newset.add("from");
    newset.add("java2s.com");

    // check if the has set is empty
    boolean isempty = newset.isEmpty();

    System.out.println("Is the hash set empty: " + isempty);
}

---

From source file:Main.java

public static void main(String args[]) {
    HashSet<String> newset = new HashSet<String>();

    // populate hash set
    newset.add("Learning");
    newset.add("from");
    newset.add("java2s.com");

    // checking elements in hash set
    System.out.println("Hash set values: " + newset);

    // clear set values
    newset.clear();//from www .  j  a  va 2  s  .co  m

    System.out.println("Hash set values after clear: " + newset);
}

---

From source file:Main.java

public static void main(String args[]) {
    HashSet<String> newset = new HashSet<String>();

    // populate hash set
    newset.add("Learning");
    newset.add("from");
    newset.add("java2s.com");

    // create an iterator
    Iterator iterator = newset.iterator();

    // check values
    while (iterator.hasNext()) {
        System.out.println("Value: " + iterator.next() + " ");
    }/*from w ww.  ja  va  2 s.  co m*/
}

---

From source file:Main.java

public static void main(String args[]) {
    // create two hash sets      
    HashSet<String> cloneset = new HashSet<String>();

    HashSet<String> newset = new HashSet<String>();

    // populate hash set
    newset.add("Learning");
    newset.add("from");
    newset.add("java2s.com");

    // clone the hash set
    cloneset = (HashSet) newset.clone();

    System.out.println("Hash set values: " + newset);
    System.out.println("Clone Hash set values: " + cloneset);
}

---

From source file:Main.java

public static void main(String[] args) {
    HashSet<Integer> hSet = new HashSet<Integer>();
    System.out.println("Size of HashSet : " + hSet.size());

    hSet.add(new Integer("1"));
    hSet.add(new Integer("2"));
    hSet.add(new Integer("3"));

    System.out.println(hSet.size());

    hSet.remove(new Integer("1"));
    System.out.println(hSet.size());
}

---

From source file:Main.java

public static void main(String[] arg) throws Exception {
    Runnable parallelCode = () -> {
        HashSet<String> allThreads = new HashSet<>();
        IntStream.range(0, 1_000_000).parallel().filter(i -> {
            allThreads.add(Thread.currentThread().getName());
            return false;
        }).min();//from w  ww . j  a v  a 2s  . c  o  m
        System.out.println("executed by " + allThreads);
    };
    System.out.println("default behavior: ");
    parallelCode.run();
    System.out.println("specialized pool:");
    ForkJoinPool pool = new ForkJoinPool(2);
    pool.submit(parallelCode).get();
}

---

From source file:com.apipulse.bastion.Main.java

public static void main(String[] args) throws IOException, ClassNotFoundException {
    log.info("Bastion starting. Loading chains");
    final File dir = new File("etc/chains");

    final LinkedList<ActorRef> chains = new LinkedList<ActorRef>();
    for (File file : dir.listFiles()) {
        if (!file.getName().startsWith(".") && file.getName().endsWith(".yaml")) {
            log.info("Loading chain: " + file.getName());
            ChainConfig config = new ChainConfig(IOUtils.toString(new FileReader(file)));
            ActorRef ref = BastionActors.getInstance().initChain(config.getName(),
                    Class.forName(config.getQualifiedClass()));
            Iterator<StageConfig> iterator = config.getStages().iterator();
            while (iterator.hasNext())
                ref.tell(iterator.next(), null);
            chains.add(ref);//w  ww.  j  a  v  a 2  s.co  m
        }
    }
    SpringApplication app = new SpringApplication();
    HashSet<Object> objects = new HashSet<Object>();
    objects.add(ApiController.class);
    final ConfigurableApplicationContext context = app.run(ApiController.class, args);
    Runtime.getRuntime().addShutdownHook(new Thread() {
        @Override
        public void run() {
            try {
                log.info("Bastion shutting down");
                Iterator<ActorRef> iterator = chains.iterator();
                while (iterator.hasNext())
                    iterator.next().tell(new StopMessage(), null);
                Thread.sleep(2000);
                context.stop();
                log.info("Bastion shutdown complete");
            } catch (Exception e) {
            }
        }
    });
}

---

From source file:be.dnsbelgium.rdap.client.RDAPCLI.java

public static void main(String[] args) {

    LOGGER.debug("Create the command line parser");
    CommandLineParser parser = new GnuParser();

    LOGGER.debug("Create the options");
    Options options = new RDAPOptions(Locale.ENGLISH);

    try {//w  w  w. j  a v a2 s .co  m
        LOGGER.debug("Parse the command line arguments");
        CommandLine line = parser.parse(options, args);

        if (line.hasOption("help")) {
            printHelp(options);
            return;
        }

        if (line.getArgs().length == 0) {
            throw new IllegalArgumentException("You must provide a query");
        }
        String query = line.getArgs()[0];

        Type type = (line.getArgs().length == 2) ? Type.valueOf(line.getArgs()[1].toUpperCase())
                : guessQueryType(query);

        LOGGER.debug("Query: {}, Type: {}", query, type);

        try {
            SSLContextBuilder sslContextBuilder = SSLContexts.custom();
            if (line.hasOption(RDAPOptions.TRUSTSTORE)) {
                sslContextBuilder.loadTrustMaterial(
                        RDAPClient.getKeyStoreFromFile(new File(line.getOptionValue(RDAPOptions.TRUSTSTORE)),
                                line.getOptionValue(RDAPOptions.TRUSTSTORE_TYPE, RDAPOptions.DEFAULT_STORETYPE),
                                line.getOptionValue(RDAPOptions.TRUSTSTORE_PASS, RDAPOptions.DEFAULT_PASS)));
            }
            if (line.hasOption(RDAPOptions.KEYSTORE)) {
                sslContextBuilder.loadKeyMaterial(
                        RDAPClient.getKeyStoreFromFile(new File(line.getOptionValue(RDAPOptions.KEYSTORE)),
                                line.getOptionValue(RDAPOptions.KEYSTORE_TYPE, RDAPOptions.DEFAULT_STORETYPE),
                                line.getOptionValue(RDAPOptions.KEYSTORE_PASS, RDAPOptions.DEFAULT_PASS)),
                        line.getOptionValue(RDAPOptions.KEYSTORE_PASS, RDAPOptions.DEFAULT_PASS).toCharArray());
            }
            SSLContext sslContext = sslContextBuilder.build();

            final String url = line.getOptionValue(RDAPOptions.URL);
            final HttpHost host = Utils.httpHost(url);

            HashSet<Header> headers = new HashSet<Header>();
            headers.add(new BasicHeader("Accept-Language",
                    line.getOptionValue(RDAPOptions.LANG, Locale.getDefault().toString())));
            HttpClientBuilder httpClientBuilder = HttpClients.custom().setDefaultHeaders(headers)
                    .setSSLSocketFactory(new SSLConnectionSocketFactory(sslContext,
                            (line.hasOption(RDAPOptions.INSECURE) ? new AllowAllHostnameVerifier()
                                    : new BrowserCompatHostnameVerifier())));

            if (line.hasOption(RDAPOptions.USERNAME) && line.hasOption(RDAPOptions.PASSWORD)) {
                BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();
                credentialsProvider.setCredentials(new AuthScope(host.getHostName(), host.getPort()),
                        new UsernamePasswordCredentials(line.getOptionValue(RDAPOptions.USERNAME),
                                line.getOptionValue(RDAPOptions.PASSWORD)));
                httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
            }

            RDAPClient rdapClient = new RDAPClient(httpClientBuilder.build(), url);
            ObjectMapper mapper = new ObjectMapper();

            JsonNode json = null;
            switch (type) {
            case DOMAIN:
                json = rdapClient.getDomainAsJson(query);
                break;
            case ENTITY:
                json = rdapClient.getEntityAsJson(query);
                break;
            case AUTNUM:
                json = rdapClient.getAutNum(query);
                break;
            case IP:
                json = rdapClient.getIp(query);
                break;
            case NAMESERVER:
                json = rdapClient.getNameserver(query);
                break;
            }
            PrintWriter out = new PrintWriter(System.out, true);
            if (line.hasOption(RDAPOptions.RAW)) {
                mapper.writer().writeValue(out, json);
            } else if (line.hasOption(RDAPOptions.PRETTY)) {
                mapper.writer(new DefaultPrettyPrinter()).writeValue(out, json);
            } else if (line.hasOption(RDAPOptions.YAML)) {
                DumperOptions dumperOptions = new DumperOptions();
                dumperOptions.setPrettyFlow(true);
                dumperOptions.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
                dumperOptions.setSplitLines(true);
                Yaml yaml = new Yaml(dumperOptions);
                Map data = mapper.convertValue(json, Map.class);
                yaml.dump(data, out);
            } else {
                mapper.writer(new MinimalPrettyPrinter()).writeValue(out, json);
            }
            out.flush();
        } catch (Exception e) {
            LOGGER.error(e.getMessage(), e);
            System.exit(-1);
        }
    } catch (org.apache.commons.cli.ParseException e) {
        printHelp(options);
        System.exit(-1);
    }
}

---

From source file:com.impetus.kundera.ycsb.benchmark.CouchDBNativeClient.java

public static void main(String[] args) {

    CouchDBNativeClient cli = new CouchDBNativeClient();

    Properties props = new Properties();

    props.setProperty("hosts", "localhost");
    props.setProperty("port", "5984");
    cli.setProperties(props);/* w ww  . ja  va 2 s.  c  om*/

    try {
        cli.init();
    } catch (Exception e) {
        e.printStackTrace();
        System.exit(0);
    }

    HashMap<String, ByteIterator> vals = new HashMap<String, ByteIterator>();
    vals.put("age", new StringByteIterator("57"));
    vals.put("middlename", new StringByteIterator("bradley"));
    vals.put("favoritecolor", new StringByteIterator("blue"));
    int res = cli.insert("usertable", "BrianFrankCooper", vals);
    System.out.println("Result of insert: " + res);

    HashMap<String, ByteIterator> result = new HashMap<String, ByteIterator>();
    HashSet<String> fields = new HashSet<String>();
    fields.add("middlename");
    fields.add("age");
    fields.add("favoritecolor");
    res = cli.read("usertable", "BrianFrankCooper", null, result);
    System.out.println("Result of read: " + res);
    for (String s : result.keySet()) {
        System.out.println("[" + s + "]=[" + result.get(s) + "]");
    }

    res = cli.delete("usertable", "BrianFrankCooper");
    System.out.println("Result of delete: " + res);

}

---

From source file:mase.deprecated.SelectionBenchmark.java

public static void main(String[] args) {

    int L = 100, N = 10000;
    double[] truncationP = new double[] { 0.25, 0.50, 0.75 };
    int[] tournamentP = new int[] { 2, 5, 7, 10 };

    DescriptiveStatistics[] truncationStat = new DescriptiveStatistics[truncationP.length];
    for (int i = 0; i < truncationStat.length; i++) {
        truncationStat[i] = new DescriptiveStatistics();
    }/*from   w ww. j av a2  s  .c  om*/
    DescriptiveStatistics[] tournamentStat = new DescriptiveStatistics[tournamentP.length];
    DescriptiveStatistics[] tournamentStat2 = new DescriptiveStatistics[tournamentP.length];
    for (int i = 0; i < tournamentStat.length; i++) {
        tournamentStat[i] = new DescriptiveStatistics();
        tournamentStat2[i] = new DescriptiveStatistics();
    }
    DescriptiveStatistics rouletteStat = new DescriptiveStatistics();
    DescriptiveStatistics rouletteStat2 = new DescriptiveStatistics();
    DescriptiveStatistics baseStat = new DescriptiveStatistics();

    for (int i = 0; i < N; i++) {
        // generate test vector
        double[] test = new double[L];
        for (int j = 0; j < L; j++) {
            test[j] = Math.random();
        }

        // truncation
        for (int p = 0; p < truncationP.length; p++) {
            double[] v = Arrays.copyOf(test, test.length);
            Arrays.sort(v);
            int nElites = (int) Math.ceil(truncationP[p] * test.length);
            double cutoff = v[test.length - nElites];
            double[] weights = new double[test.length];
            for (int k = 0; k < test.length; k++) {
                weights[k] = test[k] >= cutoff ? test[k] * (1 / truncationP[p]) : 0;
            }
            truncationStat[p].addValue(sum(weights));
        }

        // tournament
        for (int p = 0; p < tournamentP.length; p++) {
            double[] weights = new double[test.length];
            HashSet<Integer> added = new HashSet<Integer>();
            for (int k = 0; k < test.length; k++) {
                int idx = makeTournament(test, tournamentP[p]);
                weights[idx] += test[idx];
                added.add(idx);
            }
            tournamentStat2[p].addValue(added.size());
            tournamentStat[p].addValue(sum(weights));
        }

        // roulette
        double[] weights = new double[test.length];
        HashSet<Integer> added = new HashSet<Integer>();
        for (int k = 0; k < test.length; k++) {
            int idx = roulette(test);
            weights[idx] += test[idx];
            added.add(idx);
        }
        rouletteStat.addValue(sum(weights));
        rouletteStat2.addValue(added.size());

        // base
        baseStat.addValue(sum(test));
    }

    for (int p = 0; p < truncationP.length; p++) {
        System.out.println("Truncation\t" + truncationP[p] + "\t" + truncationStat[p].getMean() + "\t"
                + truncationStat[p].getStandardDeviation() + "\t" + ((int) Math.ceil(L * truncationP[p]))
                + "\t 0");
    }
    for (int p = 0; p < tournamentP.length; p++) {
        System.out.println("Tournament\t" + tournamentP[p] + "\t" + tournamentStat[p].getMean() + "\t"
                + tournamentStat[p].getStandardDeviation() + "\t" + tournamentStat2[p].getMean() + "\t"
                + tournamentStat2[p].getStandardDeviation());
    }
    System.out.println("Roulette\t\t" + rouletteStat.getMean() + "\t" + rouletteStat.getStandardDeviation()
            + "\t" + rouletteStat2.getMean() + "\t" + rouletteStat2.getStandardDeviation());
    System.out.println(
            "Base    \t\t" + baseStat.getMean() + "\t" + baseStat.getStandardDeviation() + "\t " + L + "\t0");
}

---

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