Example usage for java.util Random nextFloat

Introduction

In this page you can find the example usage for java.util Random nextFloat.

Prototype

public float nextFloat() 

Source Link

Document

Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.

Usage

From source file:services.SecurityService.java

public String getOtp() {
    String SALTCHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
    StringBuilder salt = new StringBuilder();
    Random rnd = new Random();
    while (salt.length() < 6) { // length of the random string.
        int index = (int) (rnd.nextFloat() * SALTCHARS.length());
        salt.append(SALTCHARS.charAt(index));
    }//  w w w .ja  v a2  s.co m
    String saltStr = salt.toString();
    return saltStr;
}

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From source file:com.ms.commons.lang.RangeBuilderTest.java

@Test
public void testPrimitive() {
    List<Person> data = new ArrayList<Person>();
    for (int i = 0; i < 5; i++) {
        Random r = new Random(System.nanoTime());
        Person p = new Person();
        p.setSalary(r.nextFloat());
        p.setAge((r.nextInt(10)));/*from ww  w  .  j ava2s.c om*/
        p.setId(r.nextLong());
        p.setSex(r.nextInt(10));
        p.setName("name" + r.nextInt(10));
        data.add(p);
    }
    println(data);
    Range range = RangeBuilder.data(data).property("age").range();
    println(range);
    range = RangeBuilder.data(data).property("name").keyName("newName").range();
    println(range);
    range = RangeBuilder.data(data).property("salary").desc().range();
    println(range);
    range = RangeBuilder.data(data).property("id").asc().range();
    println(range);
}

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From source file:org.apache.solr.cloud.TestRandomFlRTGCloud.java

/** 
 * Randomly chooses to do a commit, where the probability of doing so increases the longer it's been since 
 * a commit was done./*w  w  w  . j a  v a2 s .c  o m*/
 *
 * @returns <code>0</code> if a commit was done, else <code>itersSinceLastCommit + 1</code>
 */
private static int maybeCommit(final Random rand, final int itersSinceLastCommit, final int numIters)
        throws IOException, SolrServerException {
    final float threshold = itersSinceLastCommit / numIters;
    if (rand.nextFloat() < threshold) {
        log.info("COMMIT");
        assertEquals(0, getRandClient(rand).commit().getStatus());
        return 0;
    }
    return itersSinceLastCommit + 1;
}

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From source file:org.diorite.commons.math.DioriteRandomUtils.java

public static float getRandomFloat(Random random, float min, float max) throws IllegalArgumentException {
    if (Float.compare(min, max) == 0) {
        return max;
    }// w  ww  .j  a v  a  2 s  .co m
    Validate.isTrue(max > min, "Max can't be smaller than min!");
    return (random.nextFloat() * (max - min)) + min;
}

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From source file:org.apache.edgent.samples.utils.sensor.PeriodicRandomSensor.java

/**
 * Create a periodic sensor stream with readings from {@link Random#nextFloat()}.
 * @param t the topology to add the sensor stream to
 * @param periodMsec how frequently to generate a reading
 * @return the sensor value stream/*from  www.  j  a  v a2  s.co m*/
 */
public TStream<Pair<Long, Float>> newFloat(Topology t, long periodMsec) {
    Random r = newRandom();
    return t.poll(() -> new Pair<Long, Float>(System.currentTimeMillis(), r.nextFloat()), periodMsec,
            TimeUnit.MILLISECONDS);

}

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From source file:se.llbit.chunky.world.entity.PlayerEntity.java

private void randomLook(Random random) {
    yaw = (random.nextFloat() - 0.5) * QuickMath.TAU;
    headYaw = 0.4 * (random.nextFloat() - 0.5) * QuickMath.HALF_PI;
    pitch = (random.nextFloat() - 0.5) * QuickMath.HALF_PI;
}

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From source file:de.brendamour.jpasskit.server.PKRestletServerResourceFactory.java

public PKPassResource getPKPassResource() {
    return new PKPassResource("passes/coupons.raw") {

        @Override/*ww w.  j  a  va  2s .co m*/
        protected GetPKPassResponse handleGetLatestVersionOfPass(final String passTypeIdentifier,
                final String serialNumber, final String authString, final Date modifiedSince)
                throws PKAuthTokenNotValidException, PKPassNotModifiedException {
            PKPass pass = new PKPass();
            try {
                pass = jsonObjectMapper.readValue(new File("passes/coupons.raw/pass2.json"), PKPass.class);

                float newAmount = getNewRandomAmount();
                PKStoreCard storeCard = pass.getStoreCard();
                List<PKField> primaryFields = storeCard.getPrimaryFields();
                for (PKField field : primaryFields) {
                    if ("balance".equals(field.getKey())) {
                        field.setValue(newAmount);
                        field.setChangeMessage("Amount changed to %@");
                        break;
                    }

                }
                List<PKField> headerFields = storeCard.getHeaderFields();
                for (PKField field : headerFields) {
                    if ("balanceHeader".equals(field.getKey())) {
                        field.setValue(newAmount);
                        break;
                    }

                }

            } catch (Exception e) {
                throw new RuntimeException(e);
            }
            GetPKPassResponse getPKPassResponse = new GetPKPassResponse(pass, new Date());

            return getPKPassResponse;
        }

        private float getNewRandomAmount() {
            Random random = new Random();
            float amount = random.nextInt(100) + random.nextFloat();
            BigDecimal bigDecimalForRounding = new BigDecimal(amount).setScale(2, RoundingMode.HALF_EVEN);
            return bigDecimalForRounding.floatValue();
        }

        @Override
        protected PKSigningInformation getSingingInformation() {
            try {
                return PKSigningUtil.loadSigningInformationFromPKCS12FileAndIntermediateCertificateFile(
                        PKCS12_FILE_PATH, PKCS12_FILE_PASSWORD, APPLE_WWDRCA_CERT_PATH);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }

    };
}

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From source file:se.llbit.chunky.world.entity.PlayerEntity.java

private void randomPose(Random random) {
    leftLegPose = (random.nextFloat() - 0.5) * QuickMath.HALF_PI;
    rightLegPose = -leftLegPose;//from   w w w .ja  v a  2 s .  co m
    leftArmPose = (random.nextFloat() - 0.5) * QuickMath.HALF_PI;
    rightArmPose = -leftArmPose;
}

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From source file:appeng.block.misc.BlockCharger.java

@Override
@SideOnly(Side.CLIENT)/*from  w w w .ja  v  a  2 s  . c  o  m*/
public void randomDisplayTick(final IBlockState state, final World w, final BlockPos pos, final Random r) {
    if (!AEConfig.instance().isEnableEffects()) {
        return;
    }

    if (r.nextFloat() < 0.98) {
        return;
    }

    final AEBaseTile tile = this.getTileEntity(w, pos);
    if (tile instanceof TileCharger) {
        final TileCharger tc = (TileCharger) tile;

        if (AEApi.instance().definitions().materials().certusQuartzCrystalCharged()
                .isSameAs(tc.getStackInSlot(0))) {
            final double xOff = 0.0;
            final double yOff = 0.0;
            final double zOff = 0.0;

            for (int bolts = 0; bolts < 3; bolts++) {
                if (CommonHelper.proxy.shouldAddParticles(r)) {
                    final LightningFX fx = new LightningFX(w, xOff + 0.5 + pos.getX(), yOff + 0.5 + pos.getY(),
                            zOff + 0.5 + pos.getZ(), 0.0D, 0.0D, 0.0D);
                    Minecraft.getMinecraft().effectRenderer.addEffect(fx);
                }
            }
        }
    }
}

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From source file:br.unicamp.cst.behavior.glas.ActionSelectionCodelet.java

@Override
public void proc() {
    if (enabled) {

        //Update Solution Tree if needed
        Object new_solution_tree_string = SOLUTION_TREE_MO.getI();
        if (!new_solution_tree_string.equals(this.current_solution_tree_jsonarray.toString())) {
            //         System.out.println("Action Selection Found a new Solution Tree: "+new_solution_tree_string);
            JSONArray new_solution_tree_jsonarray;
            try {
                new_solution_tree_jsonarray = new JSONArray(new_solution_tree_string);
                int[] new_solution_tree_phenotype = new int[new_solution_tree_jsonarray.length()];

                for (int i = 0; i < new_solution_tree_phenotype.length; i++) {
                    new_solution_tree_phenotype[i] = new_solution_tree_jsonarray.getInt(i);
                }/*  www . ja v  a  2s  .  c om*/
                current_solution_tree_jsonarray = new_solution_tree_jsonarray;

                sm = new GlasActionSelection(new_solution_tree_phenotype);
            } catch (JSONException e) {
                e.printStackTrace();
            }
            solution_tree_fitness = SOLUTION_TREE_MO.getEvaluation();
            //            exp_factor=1-(1/(1+Math.exp(-solution_tree_fitness)));
            //1/(1+EXP(AB3*10))
            if (dynamicExplorationOn) {
                exp_factor = (1 / (1 + Math.exp(10 * solution_tree_fitness)));
            }

        }

        //Selects action based on stimulus

        boolean new_stim = (NEW_STIM_MO.getI().equals(String.valueOf(true)));
        boolean new_action = (NEW_ACTION_MO.getI().equals(String.valueOf(true)));
        boolean new_reward = (NEW_REWARD_MO.getI().equals(String.valueOf(true)));

        if (!STIMULUS_MO.getI().equals("") && new_stim && !new_action && !new_reward) {

            int[] stimulus = { Integer.valueOf((String) STIMULUS_MO.getI()) };
            int[] selected_action = sm.runStimuli(stimulus); //TODO Ugly solution

            //TODO Add an exploratory element here?

            Random rnd_exp = new Random();

            if (rnd_exp.nextFloat() <= exp_factor) {
                int[] actions = sm.getActions();
                selected_action[0] = actions[rnd_exp.nextInt(actions.length)];

            }

            ACTION_MO.updateI(Integer.toString(selected_action[0])); //TODO is [0] correct?
            //         System.out.println("ACTION_MO.updateInfo("+selected_action[0]+")");

            new_action = true;
            //         System.out.println("new_action=true;");
        }

        NEW_ACTION_MO.updateI(String.valueOf(new_action));

    } //end if(enabled)
}

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