List of usage examples for java.lang Math random
public static double random()
From source file:lab.example.service.LotteryService.java
public void run(String... args) { try {/*from w ww. ja v a 2 s.c om*/ while (true) { final UUID uuid = UUID.randomUUID(); final Integer randomPrice = 1 + (int) (Math.random() * 36); Lot lot = new Lot(uuid.toString(), randomPrice); stockSave(lot); Thread.sleep(10 * 1000); } } catch (Exception e) { logger.error(e.getMessage(), e); } }
From source file:com.c123.billbuddy.client.PaymentFeeder.java
@Transactional public void createPayment() { Random random = new Random(); int userId = (int) (userCount * random.nextDouble()); user = gigaSpace.readById(User.class, new Integer(userId)); int merchantId = (int) (merchantCount * random.nextDouble()); merchant = gigaSpace.readById(Merchant.class, new Integer(merchantId)); if (user != null && merchant != null) { Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(System.currentTimeMillis()); Date date = calendar.getTime(); Double paymentAmount = Double.valueOf(Math.random() * 100); paymentAmount = Math.round(paymentAmount * 100.0) / 100.0; // Check If user valid and have credit limit if (user.getStatus() != AccountStatus.ACTIVE) { log.info("User: " + user.getName() + " status is " + user.getStatus()); } else if (user.getBalance() - paymentAmount < user.getCreditLimit()) { log.info("User: " + user.getName() + " doesn't have credit."); Double addUserBalance = Double.valueOf(Math.random() * 1000); addUserBalance = Math.round(addUserBalance * 100.0) / 100.0; log.info("Add " + addUserBalance + " to user balance"); user.setBalance(user.getBalance() + addUserBalance); gigaSpace.write(user);//from w w w .j a va 2 s . co m } else { // Withdraw payment amount from user account updateUserBalance(user, paymentAmount); // Deposit payment amount to merchant account updateMerchantReceipts(merchant, paymentAmount); // Create a Payment POJO and set it up. Payment payment = new Payment(); payment.setPayingAccountId(user.getUserAccountId()); payment.setReceivingMerchantId(merchant.getMerchantAccountId()); payment.setDescription(merchant.getCategory().name()); payment.setCreatedDate(date); payment.setPaymentAmount(Double.valueOf(Math.random() * 100)); payment.setPaymentAmount(Math.round(paymentAmount * 100.0) / 100.0); payment.setStatus(TransactionStatus.NEW); // Write the payment object gigaSpace.write(payment); log.info("TransactionWriterTask wrote new transaction between user: " + user.getName() + " and merchant: " + merchant.getName()); } } }
From source file:com.ciphertool.genetics.algorithms.mutation.GroupMutationAlgorithm.java
/** * Performs a genetic mutation of a random Gene group of the supplied * Chromosome/* w w w .j a v a2 s. com*/ * * @param chromosome * the Chromosome to mutate */ private void mutateRandomGeneGroup(Chromosome chromosome, Map<Integer, Integer> geneIndices) { /* * Choose a random number of genes constrained by the static max and the * total number of genes */ int numGenesToMutate = (int) (Math.random() * Math.min(MAX_GENES_PER_GROUP, chromosome.getGenes().size())) + 1; int randomIndex; // We don't want to reuse an index, so loop until we find a new one int attempts = 0; do { randomIndex = (int) (Math.random() * chromosome.getGenes().size()); attempts++; if (attempts >= MAX_ATTEMPTS_PER_MUTATION) { if (log.isTraceEnabled()) { log.trace("Exceeded " + MAX_ATTEMPTS_PER_MUTATION + " attempts at finding a gene group to mutate. Returning without performing mutation."); } return; } } while (exceedsChromosomeSize(chromosome, randomIndex + numGenesToMutate) || overlapsPreviousMutation(geneIndices, randomIndex, randomIndex + numGenesToMutate)); mutateGeneGroup(chromosome, randomIndex, numGenesToMutate); geneIndices.put(randomIndex, randomIndex + numGenesToMutate - 1); }
From source file:de.fau.amos.FileUpload.java
@Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String pathInfo = request.getPathInfo(); System.out.println("called fileupload: " + pathInfo); boolean isImportProductionData = pathInfo != null && pathInfo.startsWith("/importProductionData"); boolean isImportEnergyData = pathInfo != null && pathInfo.startsWith("/importEnergyData"); if (ServletFileUpload.isMultipartContent(request)) { try {//ww w . j a v a 2 s . co m List<FileItem> list = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request); for (FileItem fi : list) { if (!fi.isFormField()) { String rand = ""; for (int i = 0; i < 6; i++) { rand += (int) (Math.random() * 10); } String plantId = ""; if (isImportEnergyData || isImportProductionData) { plantId = request.getPathInfo().replace((isImportEnergyData ? "/importEnergyData" : (isImportProductionData ? "/importProductionData" : "")), ""); } if (plantId == null || plantId.length() == 0) { plantId = ""; // }else{ // plantId="_"+plantId; } String name = new File(rand + "_" + fi.getName()).getName() + (isImportEnergyData ? "_impED" + plantId : (isImportProductionData ? "_impPD" + plantId : "")); File folder = null; if (isImportEnergyData || isImportProductionData) { folder = new File(System.getProperty("userdir.location"), "import"); } else { folder = new File(System.getProperty("userdir.location"), "uploads"); } if (!folder.exists()) { folder.mkdirs(); } fi.write(new File(folder, name)); } } request.setAttribute("message", "File uploaded successfully"); } catch (Exception e) { request.setAttribute("errorMessage", "File upload failed!"); } } else { request.setAttribute("errorMessage", "Something went wrong."); } if (isImportEnergyData || isImportProductionData) { // request.setAttribute("plant",request.getPathInfo().replace("/import","")); // request.getRequestDispatcher("/intern/import.jsp").forward(request, response); response.sendRedirect(request.getContextPath() + "/intern/import.jsp"); } else { response.sendRedirect(request.getContextPath() + "/intern/funktion3.jsp"); } }
From source file:com.hortonworks.pso.data.generator.fields.StringField.java
public String getPoolValue() { int ran = (int) Math.round((poolSize - 1) * Math.random()); return pool[ran]; }
From source file:nya.miku.wishmaster.http.client.DCP.java
private String getRandom() { return Long.toString((long) Math.floor(Math.random() * 1000000000)); }
From source file:com.btobits.automator.ant.utils.task.RandomTask.java
protected double calculateRandom2(double minD, double maxD) { return minD + Math.random() * (maxD - minD); }
From source file:fr.fg.server.contract.NpcHelper.java
public static String getRandomFaction(String... factions) { return factions[(int) (Math.random() * factions.length)]; }
From source file:JVMRandom.java
/** * <p>Returns a pseudorandom, uniformly distributed long value between * <code>0</code> (inclusive) and the specified value (exclusive), from * the Math.random() sequence.</p> * * @param n the specified exclusive max-value * @return the random long//from w w w . j a v a 2s . co m * @throws IllegalArgumentException when <code>n <= 0</code> */ public static long nextLong(long n) { if (n <= 0) { throw new IllegalArgumentException("Upper bound for nextInt must be positive"); } // TODO: check this cannot return 'n' return (long) (Math.random() * n); }