Example usage for java.util Random nextBoolean

Introduction

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

Prototype

public boolean nextBoolean() 

Source Link

Document

Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.

Usage

From source file:org.hellojavaer.testcase.generator.TestCaseGenerator.java

private static void convertNum(long num, Character[] baseChar, Random random, StringBuilder result) {
    if (num <= 0 && result.length() == 0) {
        result.insert(0, baseChar[0]);/*w  w  w. j a v  a2 s  .co m*/
    } else if (num > 0) {
        int i = (int) (num % baseChar.length);
        Character ch = random.nextBoolean() ? baseChar[i] : Character.toLowerCase(baseChar[i]);
        result.insert(0, ch);
        convertNum(num / baseChar.length, baseChar, random, result);
    }
}

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From source file:org.brekka.stillingar.example.FieldTypesDOMTest.java

private static Testing writeConfig() {
    Random r = new Random();
    ConfigurationDocument doc = ConfigurationDocument.Factory.newInstance();
    Configuration newConfiguration = doc.addNewConfiguration();
    FeatureFlagType featureFlag = newConfiguration.addNewFeatureFlag();
    featureFlag.setKey("turbo");
    featureFlag.setBooleanValue(true);//from   w w  w.ja  v a2  s  . c o m
    Testing testing = newConfiguration.addNewTesting();
    testing.setAnyURI("http://brekka.org/" + RandomStringUtils.randomAlphanumeric(10));
    testing.setBoolean(r.nextBoolean());
    testing.setByte((byte) r.nextInt());
    Calendar cal = Calendar.getInstance();
    testing.setDate(cal);
    testing.setDateTime(cal);
    testing.setDecimal(BigDecimal.valueOf(r.nextDouble()));
    testing.setDouble(r.nextDouble());
    testing.setFloat(r.nextFloat());
    testing.setInt(r.nextInt());
    testing.setInteger(BigInteger.valueOf(r.nextLong()));
    testing.setLanguage("en");
    testing.setLong(r.nextLong());
    testing.setShort((short) r.nextInt());
    testing.setString(RandomStringUtils.randomAlphanumeric(24));
    testing.setTime(cal);
    testing.setUUID(UUID.randomUUID().toString());
    testing.setPeriod(new GDuration("P5Y2M10DT15H"));
    byte[] binary = new byte[32];
    r.nextBytes(binary);
    testing.setBinary(binary);
    TestSupport.write(doc);
    return testing;
}

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From source file:org.apache.hadoop.hive.ql.exec.vector.RandomRowObjectSource.java

public static HiveDecimal getRandHiveDecimal(Random r, DecimalTypeInfo decimalTypeInfo) {
    while (true) {
        StringBuilder sb = new StringBuilder();
        int precision = 1 + r.nextInt(18);
        int scale = 0 + r.nextInt(precision + 1);

        int integerDigits = precision - scale;

        if (r.nextBoolean()) {
            sb.append("-");
        }//from  w ww  . j  a v  a2 s  . c om

        if (integerDigits == 0) {
            sb.append("0");
        } else {
            sb.append(getRandString(r, DECIMAL_CHARS, integerDigits));
        }
        if (scale != 0) {
            sb.append(".");
            sb.append(getRandString(r, DECIMAL_CHARS, scale));
        }

        HiveDecimal bd = HiveDecimal.create(sb.toString());
        if (bd.scale() > bd.precision()) {
            // Sometimes weird decimals are produced?
            continue;
        }

        return bd;
    }
}

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From source file:org.apache.solr.response.transform.TestSubQueryTransformer.java

static String[] daveMultiValueSearchParams(Random random, int peopleMult, int deptMult) {
    return new String[] { "q", "name_s:dave", "indent", "true", "fl",
            (random().nextBoolean() ? "name_s_dv" : "*") + //"dept_ss_dv,
                    ",subq1:[subquery " + ((random.nextBoolean() ? "" : "separator=,")) + "]",
            "rows", "" + peopleMult, "subq1.q",
            "{!terms f=dept_id_s v=$row.dept_ss_dv " + ((random.nextBoolean() ? "" : "separator=,")) + "}",
            "subq1.fl", "text_t", "subq1.indent", "true", "subq1.rows", "" + (deptMult * 2),
            "subq1.logParamsList", "q,fl,rows,row.dept_ss_dv" };
}

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From source file:juicebox.tools.utils.common.MatrixTools.java

/**
 * Generate a matrix with randomly initialized 1s and 0s
 *
 * @param rows//from  w w w . j  a  v a2  s.  c  o  m
 * @param cols
 * @return randomized binary matrix
 */
private static RealMatrix randomUnitMatrix(int rows, int cols) {
    Random generator = new Random();
    RealMatrix matrix = cleanArray2DMatrix(rows, cols);
    for (int r = 0; r < rows; r++)
        for (int c = 0; c < cols; c++)
            if (generator.nextBoolean())
                matrix.setEntry(r, c, 1);
    return matrix;
}

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From source file:org.apache.hadoop.hive.serde2.binarysortable.MyTestPrimitiveClass.java

public static HiveDecimal getRandHiveDecimal(Random r, ExtraTypeInfo extraTypeInfo) {
    while (true) {
        StringBuilder sb = new StringBuilder();
        int precision = 1 + r.nextInt(18);
        int scale = 0 + r.nextInt(precision + 1);

        int integerDigits = precision - scale;

        if (r.nextBoolean()) {
            sb.append("-");
        }//from   w  w w. ja v a  2s.co  m

        if (integerDigits == 0) {
            sb.append("0");
        } else {
            sb.append(getRandString(r, DECIMAL_CHARS, integerDigits));
        }
        if (scale != 0) {
            sb.append(".");
            sb.append(getRandString(r, DECIMAL_CHARS, scale));
        }

        HiveDecimal dec = HiveDecimal.create(sb.toString());
        extraTypeInfo.precision = dec.precision();
        extraTypeInfo.scale = dec.scale();
        return dec;
    }
}

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From source file:org.apache.hadoop.hive.ql.exec.vector.VectorRandomRowSource.java

public static HiveDecimal getRandHiveDecimal(Random r, DecimalTypeInfo decimalTypeInfo) {
    while (true) {
        StringBuilder sb = new StringBuilder();
        int precision = 1 + r.nextInt(18);
        int scale = 0 + r.nextInt(precision + 1);

        int integerDigits = precision - scale;

        if (r.nextBoolean()) {
            sb.append("-");
        }// w  ww .  j av  a  2 s  . c o  m

        if (integerDigits == 0) {
            sb.append("0");
        } else {
            sb.append(RandomTypeUtil.getRandString(r, DECIMAL_CHARS, integerDigits));
        }
        if (scale != 0) {
            sb.append(".");
            sb.append(RandomTypeUtil.getRandString(r, DECIMAL_CHARS, scale));
        }

        HiveDecimal bd = HiveDecimal.create(sb.toString());
        if (bd.scale() > bd.precision()) {
            // Sometimes weird decimals are produced?
            continue;
        }

        return bd;
    }
}

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From source file:org.latticesoft.util.common.NumeralUtil.java

/**
 * Generates next random boolean/*w  w w  .  j  ava2 s .c o m*/
 * @return the generated boolean
 */
public static boolean getRandomBoolean() {
    Random rand = new Random(System.currentTimeMillis());
    return rand.nextBoolean();
}

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From source file:org.apache.hadoop.fs.TestAppendStress.java

private static void writeToFile(Random random, FSDataOutputStream out, int len, DataChecksum checksum)
        throws IOException {
    if (len == 0) {
        return;//w w  w  .  ja  v a2  s.  co m
    }

    LOG.info("Write " + len + " bytes to file.");
    int bufferSize = 1024 * 1024;
    byte[] buffer = new byte[bufferSize];
    int toLen = len;
    while (toLen > 0) {
        random.nextBytes(buffer);
        int numWrite = Math.min(toLen, buffer.length);
        out.write(buffer, 0, numWrite);
        checksum.update(buffer, 0, numWrite);
        toLen -= numWrite;

        // randomly do sync or not.
        if (random.nextBoolean()) {
            out.sync();
        }
    }
}

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From source file:truco.plugin.utils.Utils.java

public static void spawnRandomFirework(Location loc) {
    Firework fw = (Firework) loc.getWorld().spawnEntity(loc, EntityType.FIREWORK);
    FireworkMeta fwm = fw.getFireworkMeta();
    Random r = CardWarsPlugin.random;
    int rt = r.nextInt(4) + 1;
    FireworkEffect.Type type = FireworkEffect.Type.BALL;
    if (rt == 1) {
        type = FireworkEffect.Type.BALL;
    }//from w  ww  .j av  a  2 s .  c  om
    if (rt == 2) {
        type = FireworkEffect.Type.BALL_LARGE;
    }
    if (rt == 3) {
        type = FireworkEffect.Type.BURST;
    }
    if (rt == 4) {
        type = FireworkEffect.Type.CREEPER;
    }
    if (rt == 5) {
        type = FireworkEffect.Type.STAR;
    }
    Color c1 = Color.fromRGB(170, 0, 0);
    Color c2 = Color.WHITE;
    Color c3 = Color.GRAY;
    FireworkEffect effect = FireworkEffect.builder().flicker(r.nextBoolean()).withColor(c1).withColor(c2)
            .withFade(c3).with(type).trail(r.nextBoolean()).build();
    fwm.addEffect(effect);
    int rp = r.nextInt(2) + 1;
    fwm.setPower(rp);
    fw.setFireworkMeta(fwm);
}

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