Package edu.internet2.middleware.grouperClientExt.org.apache.commons.lang3

Class RandomUtils

java.lang.Object
edu.internet2.middleware.grouperClientExt.org.apache.commons.lang3.RandomUtils
public class RandomUtils extends Object

Utility library that supplements the standard Random class.

Caveat: Instances of Random are not cryptographically secure.

Please note that the Apache Commons project provides a component dedicated to pseudo-random number generation, namely Commons RNG, that may be a better choice for applications with more stringent requirements (performance and/or correctness).

Since:
3.3

  • Constructor Summary

    Constructors
    Constructor
    Description
    RandomUtils()
    RandomUtils instances should NOT be constructed in standard programming.

  • Method Summary

    Modifier and Type
    Method
    Description
    static boolean
    nextBoolean()
    Returns a random boolean value
    static byte[]
    nextBytes(int count)
    Creates an array of random bytes.
    static double
    nextDouble()
    Returns a random double within 0 - Double.MAX_VALUE
    static double
    nextDouble(double startInclusive, double endExclusive)
    Returns a random double within the specified range.
    static float
    nextFloat()
    Returns a random float within 0 - Float.MAX_VALUE
    static float
    nextFloat(float startInclusive, float endExclusive)
    Returns a random float within the specified range.
    static int
    nextInt()
    Returns a random int within 0 - Integer.MAX_VALUE
    static int
    nextInt(int startInclusive, int endExclusive)
    Returns a random integer within the specified range.
    static long
    nextLong()
    Returns a random long within 0 - Long.MAX_VALUE
    static long
    nextLong(long startInclusive, long endExclusive)
    Returns a random long within the specified range.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • RandomUtils

      public RandomUtils()

      RandomUtils instances should NOT be constructed in standard programming. Instead, the class should be used as RandomUtils.nextBytes(5);.

      This constructor is public to permit tools that require a JavaBean instance to operate.

  • Method Details

    • nextBoolean

      public static boolean nextBoolean()

      Returns a random boolean value

      Returns:
      the random boolean
      Since:
      3.5

    • nextBytes

      public static byte[] nextBytes(int count)

      Creates an array of random bytes.

      Parameters:
      count - the size of the returned array
      Returns:
      the random byte array
      Throws:
      IllegalArgumentException - if count is negative

    • nextInt

      public static int nextInt(int startInclusive, int endExclusive)

      Returns a random integer within the specified range.

      Parameters:
      startInclusive - the smallest value that can be returned, must be non-negative
      endExclusive - the upper bound (not included)
      Returns:
      the random integer
      Throws:
      IllegalArgumentException - if startInclusive > endExclusive or if startInclusive is negative

    • nextInt

      public static int nextInt()

      Returns a random int within 0 - Integer.MAX_VALUE

      Returns:
      the random integer
      Since:
      3.5
      See Also:

    • nextLong

      public static long nextLong(long startInclusive, long endExclusive)

      Returns a random long within the specified range.

      Parameters:
      startInclusive - the smallest value that can be returned, must be non-negative
      endExclusive - the upper bound (not included)
      Returns:
      the random long
      Throws:
      IllegalArgumentException - if startInclusive > endExclusive or if startInclusive is negative

    • nextLong

      public static long nextLong()

      Returns a random long within 0 - Long.MAX_VALUE

      Returns:
      the random long
      Since:
      3.5
      See Also:

    • nextDouble

      public static double nextDouble(double startInclusive, double endExclusive)

      Returns a random double within the specified range.

      Parameters:
      startInclusive - the smallest value that can be returned, must be non-negative
      endExclusive - the upper bound (not included)
      Returns:
      the random double
      Throws:
      IllegalArgumentException - if startInclusive > endExclusive or if startInclusive is negative

    • nextDouble

      public static double nextDouble()

      Returns a random double within 0 - Double.MAX_VALUE

      Returns:
      the random double
      Since:
      3.5
      See Also:

    • nextFloat

      public static float nextFloat(float startInclusive, float endExclusive)

      Returns a random float within the specified range.

      Parameters:
      startInclusive - the smallest value that can be returned, must be non-negative
      endExclusive - the upper bound (not included)
      Returns:
      the random float
      Throws:
      IllegalArgumentException - if startInclusive > endExclusive or if startInclusive is negative

    • nextFloat

      public static float nextFloat()

      Returns a random float within 0 - Float.MAX_VALUE

      Returns:
      the random float
      Since:
      3.5
      See Also: