Package Summary Overview Summary

### class:ThreadLocalRandom [NONE]
All Implemented Interfaces: `Serializable`, `RandomGenerator` public final class ThreadLocalRandom extends Random A random number generator (with period 264) isolated to the current thread. Like the global `Random` generator used by the `Math` class, a `ThreadLocalRandom` is initialized with an internally generated seed that may not otherwise be modified. When applicable, use of `ThreadLocalRandom` rather than shared `Random` objects in concurrent programs will typically encounter much less overhead and contention. Use of `ThreadLocalRandom` is particularly appropriate when multiple tasks (for example, each a `ForkJoinTask`) use random numbers in parallel in thread pools. Usages of this class should typically be of the form: `ThreadLocalRandom.current().nextX(...)` (where `X` is `Int`, `Long`, etc). When all usages are of this form, it is never possible to accidentally share a `ThreadLocalRandom` across multiple threads. This class also provides additional commonly used bounded random generation methods. Instances of `ThreadLocalRandom` are not cryptographically secure. Consider instead using `SecureRandom` in security-sensitive applications. Additionally, default-constructed instances do not use a cryptographically random seed unless the system property `java.util.secureRandomSeed` is set to `true`. Since: 1.7 See Also: Serialized Form

### method:current() [NONE]
### current public static ThreadLocalRandom current() Returns the current thread's `ThreadLocalRandom` object. Methods of this object should be called only by the current thread, not by other threads. Returns: the current thread's `ThreadLocalRandom`

### method:setSeed(long) [NONE]
### setSeed public void setSeed (long seed) Throws `UnsupportedOperationException`. Setting seeds in this generator is not supported. Overrides: `setSeed` in class `Random` Parameters: `seed` - the initial seed Throws: `UnsupportedOperationException` - always

### method:next(int) [NONE]
### next protected int next (int bits) Generates a pseudorandom number with the indicated number of low-order bits. Because this class has no subclasses, this method cannot be invoked or overridden. Overrides: `next` in class `Random` Parameters: `bits` - random bits Returns: the next pseudorandom value from this random number generator's sequence

### method:nextInt(int) [NONE]
### nextInt public int nextInt (int bound) Returns a pseudorandom, uniformly distributed `int` value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence. The general contract of `nextInt` is that one `int` value in the specified range is pseudorandomly generated and returned. All `bound` possible `int` values are produced with (approximately) equal probability. Specified by: `nextInt` in interface `RandomGenerator` Overrides: `nextInt` in class `Random` Parameters: `bound` - the upper bound (exclusive). Must be positive. Returns: the next pseudorandom, uniformly distributed `int` value between zero (inclusive) and `bound` (exclusive) from this random number generator's sequence Throws: `IllegalArgumentException` - if bound is not positive

### method:nextInt(int,int) [NONE]
### nextInt public int nextInt (int origin, int bound) Returns a pseudorandomly chosen `int` value between the specified origin (inclusive) and the specified bound (exclusive). Parameters: `origin` - the least value that can be returned `bound` - the upper bound (exclusive) for the returned value Returns: a pseudorandomly chosen `int` value between the origin (inclusive) and the bound (exclusive) Throws: `IllegalArgumentException` - if `origin` is greater than or equal to `bound`

### method:nextLong(long) [NONE]
### nextLong public long nextLong (long bound) Returns a pseudorandomly chosen `long` value between zero (inclusive) and the specified bound (exclusive). Parameters: `bound` - the upper bound (exclusive) for the returned value. Must be positive. Returns: a pseudorandomly chosen `long` value between zero (inclusive) and the bound (exclusive) Throws: `IllegalArgumentException` - if `bound` is not positive

### method:nextLong(long,long) [NONE]
### nextLong public long nextLong (long origin, long bound) Returns a pseudorandomly chosen `long` value between the specified origin (inclusive) and the specified bound (exclusive). Parameters: `origin` - the least value that can be returned `bound` - the upper bound (exclusive) for the returned value Returns: a pseudorandomly chosen `long` value between the origin (inclusive) and the bound (exclusive) Throws: `IllegalArgumentException` - if `origin` is greater than or equal to `bound`

### method:nextFloat(float) [NONE]
### nextFloat public float nextFloat (float bound) Returns a pseudorandomly chosen `float` value between zero (inclusive) and the specified bound (exclusive). Implementation Note: Parameters: `bound` - the upper bound (exclusive) for the returned value. Must be positive and finite Returns: a pseudorandomly chosen `float` value between zero (inclusive) and the bound (exclusive) Throws: `IllegalArgumentException` - if `bound` is not both positive and finite

### method:nextFloat(float,float) [NONE]
### nextFloat public float nextFloat (float origin, float bound) Returns a pseudorandomly chosen `float` value between the specified origin (inclusive) and the specified bound (exclusive). Implementation Note: Parameters: `origin` - the least value that can be returned `bound` - the upper bound (exclusive) Returns: a pseudorandomly chosen `float` value between the origin (inclusive) and the bound (exclusive) Throws: `IllegalArgumentException` - if `origin` is not finite, or `bound` is not finite, or `origin` is greater than or equal to `bound`

### method:nextDouble(double) [NONE]
### nextDouble public double nextDouble (double bound) Returns a pseudorandomly chosen `double` value between zero (inclusive) and the specified bound (exclusive). Implementation Note: Parameters: `bound` - the upper bound (exclusive) for the returned value. Must be positive and finite Returns: a pseudorandomly chosen `double` value between zero (inclusive) and the bound (exclusive) Throws: `IllegalArgumentException` - if `bound` is not both positive and finite

### method:nextDouble(double,double) [NONE]
### nextDouble public double nextDouble (double origin, double bound) Returns a pseudorandomly chosen `double` value between the specified origin (inclusive) and the specified bound (exclusive). Implementation Note: Parameters: `origin` - the least value that can be returned `bound` - the upper bound (exclusive) for the returned value Returns: a pseudorandomly chosen `double` value between the origin (inclusive) and the bound (exclusive) Throws: `IllegalArgumentException` - if `origin` is not finite, or `bound` is not finite, or `origin` is greater than or equal to `bound`

### method:ints(long) [NONE]
### ints public IntStream ints (long streamSize) Returns a stream producing the given `streamSize` number of pseudorandom `int` values. A pseudorandom `int` value is generated as if it's the result of calling the method `Random.nextInt()`. Specified by: `ints` in interface `RandomGenerator` Overrides: `ints` in class `Random` Parameters: `streamSize` - the number of values to generate Returns: a stream of pseudorandom `int` values Throws: `IllegalArgumentException` - if `streamSize` is less than zero Since: 1.8

### method:ints() [NONE]
### ints public IntStream ints() Returns an effectively unlimited stream of pseudorandom `int` values. A pseudorandom `int` value is generated as if it's the result of calling the method `Random.nextInt()`. Specified by: `ints` in interface `RandomGenerator` Overrides: `ints` in class `Random` Implementation Note: This method is implemented to be equivalent to `ints(Long.MAX_VALUE)`. Returns: a stream of pseudorandom `int` values Since: 1.8

### method:ints(long,int,int) [NONE]
### ints public IntStream ints (long streamSize, int randomNumberOrigin, int randomNumberBound) Returns a stream producing the given `streamSize` number of pseudorandom `int` values, each conforming to the given origin (inclusive) and bound (exclusive). A pseudorandom `int` value is generated as if it's the result of calling the following method with the origin and bound:
     int nextInt(int origin, int bound) {
       int n = bound - origin;
       if (n > 0) {
         return nextInt(n) + origin;
       }
       else {  // range not representable as int
         int r;
         do {
           r = nextInt();
         } while (r < origin || r >= bound);
         return r;
       }
     }
Specified by: `ints` in interface `RandomGenerator` Overrides: `ints` in class `Random` Parameters: `streamSize` - the number of values to generate `randomNumberOrigin` - the origin (inclusive) of each random value `randomNumberBound` - the bound (exclusive) of each random value Returns: a stream of pseudorandom `int` values, each with the given origin (inclusive) and bound (exclusive) Throws: `IllegalArgumentException` - if `streamSize` is less than zero, or `randomNumberOrigin` is greater than or equal to `randomNumberBound` Since: 1.8

### method:ints(int,int) [NONE]
### ints public IntStream ints (int randomNumberOrigin, int randomNumberBound) Returns an effectively unlimited stream of pseudorandom `int` values, each conforming to the given origin (inclusive) and bound (exclusive). A pseudorandom `int` value is generated as if it's the result of calling the following method with the origin and bound:
     int nextInt(int origin, int bound) {
       int n = bound - origin;
       if (n > 0) {
         return nextInt(n) + origin;
       }
       else {  // range not representable as int
         int r;
         do {
           r = nextInt();
         } while (r < origin || r >= bound);
         return r;
       }
     }
Specified by: `ints` in interface `RandomGenerator` Overrides: `ints` in class `Random` Implementation Note: This method is implemented to be equivalent to `ints(Long.MAX_VALUE, randomNumberOrigin, randomNumberBound)` . Parameters: `randomNumberOrigin` - the origin (inclusive) of each random value `randomNumberBound` - the bound (exclusive) of each random value Returns: a stream of pseudorandom `int` values, each with the given origin (inclusive) and bound (exclusive) Throws: `IllegalArgumentException` - if `randomNumberOrigin` is greater than or equal to `randomNumberBound` Since: 1.8

### method:longs(long) [NONE]
### longs public LongStream longs (long streamSize) Returns a stream producing the given `streamSize` number of pseudorandom `long` values. A pseudorandom `long` value is generated as if it's the result of calling the method `Random.nextLong()`. Specified by: `longs` in interface `RandomGenerator` Overrides: `longs` in class `Random` Parameters: `streamSize` - the number of values to generate Returns: a stream of pseudorandom `long` values Throws: `IllegalArgumentException` - if `streamSize` is less than zero Since: 1.8

### method:longs() [NONE]
### longs public LongStream longs() Returns an effectively unlimited stream of pseudorandom `long` values. A pseudorandom `long` value is generated as if it's the result of calling the method `Random.nextLong()`. Specified by: `longs` in interface `RandomGenerator` Overrides: `longs` in class `Random` Implementation Note: This method is implemented to be equivalent to `longs(Long.MAX_VALUE)`. Returns: a stream of pseudorandom `long` values Since: 1.8

### method:longs(long,long,long) [NONE]
### longs public LongStream longs (long streamSize, long randomNumberOrigin, long randomNumberBound) Returns a stream producing the given `streamSize` number of pseudorandom `long`, each conforming to the given origin (inclusive) and bound (exclusive). A pseudorandom `long` value is generated as if it's the result of calling the following method with the origin and bound:
     long nextLong(long origin, long bound) {
       long r = nextLong();
       long n = bound - origin, m = n - 1;
       if ((n & m) == 0L)  // power of two
         r = (r & m) + origin;
       else if (n > 0L) {  // reject over-represented candidates
         for (long u = r >>> 1;            // ensure nonnegative
              u + m - (r = u % n) < 0L;    // rejection check
              u = nextLong() >>> 1) // retry
             ;
         r += origin;
       }
       else {              // range not representable as long
         while (r < origin || r >= bound)
           r = nextLong();
       }
       return r;
     }
Specified by: `longs` in interface `RandomGenerator` Overrides: `longs` in class `Random` Parameters: `streamSize` - the number of values to generate `randomNumberOrigin` - the origin (inclusive) of each random value `randomNumberBound` - the bound (exclusive) of each random value Returns: a stream of pseudorandom `long` values, each with the given origin (inclusive) and bound (exclusive) Throws: `IllegalArgumentException` - if `streamSize` is less than zero, or `randomNumberOrigin` is greater than or equal to `randomNumberBound` Since: 1.8

### method:longs(long,long) [NONE]
### longs public LongStream longs (long randomNumberOrigin, long randomNumberBound) Returns an effectively unlimited stream of pseudorandom `long` values, each conforming to the given origin (inclusive) and bound (exclusive). A pseudorandom `long` value is generated as if it's the result of calling the following method with the origin and bound:
     long nextLong(long origin, long bound) {
       long r = nextLong();
       long n = bound - origin, m = n - 1;
       if ((n & m) == 0L)  // power of two
         r = (r & m) + origin;
       else if (n > 0L) {  // reject over-represented candidates
         for (long u = r >>> 1;            // ensure nonnegative
              u + m - (r = u % n) < 0L;    // rejection check
              u = nextLong() >>> 1) // retry
             ;
         r += origin;
       }
       else {              // range not representable as long
         while (r < origin || r >= bound)
           r = nextLong();
       }
       return r;
     }
Specified by: `longs` in interface `RandomGenerator` Overrides: `longs` in class `Random` Implementation Note: This method is implemented to be equivalent to `longs(Long.MAX_VALUE, randomNumberOrigin, randomNumberBound)` . Parameters: `randomNumberOrigin` - the origin (inclusive) of each random value `randomNumberBound` - the bound (exclusive) of each random value Returns: a stream of pseudorandom `long` values, each with the given origin (inclusive) and bound (exclusive) Throws: `IllegalArgumentException` - if `randomNumberOrigin` is greater than or equal to `randomNumberBound` Since: 1.8

### method:doubles(long) [NONE]
### doubles public DoubleStream doubles (long streamSize) Returns a stream producing the given `streamSize` number of pseudorandom `double` values, each between zero (inclusive) and one (exclusive). A pseudorandom `double` value is generated as if it's the result of calling the method `Random.nextDouble()`. Specified by: `doubles` in interface `RandomGenerator` Overrides: `doubles` in class `Random` Parameters: `streamSize` - the number of values to generate Returns: a stream of `double` values Throws: `IllegalArgumentException` - if `streamSize` is less than zero Since: 1.8

### method:doubles() [NONE]
### doubles public DoubleStream doubles() Returns an effectively unlimited stream of pseudorandom `double` values, each between zero (inclusive) and one (exclusive). A pseudorandom `double` value is generated as if it's the result of calling the method `Random.nextDouble()`. Specified by: `doubles` in interface `RandomGenerator` Overrides: `doubles` in class `Random` Implementation Note: This method is implemented to be equivalent to `doubles(Long.MAX_VALUE)`. Returns: a stream of pseudorandom `double` values Since: 1.8

### method:doubles(long,double,double) [NONE]
### doubles public DoubleStream doubles (long streamSize, double randomNumberOrigin, double randomNumberBound) Returns a stream producing the given `streamSize` number of pseudorandom `double` values, each conforming to the given origin (inclusive) and bound (exclusive). A pseudorandom `double` value is generated as if it's the result of calling the following method with the origin and bound:
     double nextDouble(double origin, double bound) {
       double r = nextDouble();
       r = r * (bound - origin) + origin;
       if (r >= bound) // correct for rounding
         r = Math.nextDown(bound);
       return r;
     }
Specified by: `doubles` in interface `RandomGenerator` Overrides: `doubles` in class `Random` Parameters: `streamSize` - the number of values to generate `randomNumberOrigin` - the origin (inclusive) of each random value `randomNumberBound` - the bound (exclusive) of each random value Returns: a stream of pseudorandom `double` values, each with the given origin (inclusive) and bound (exclusive) Throws: `IllegalArgumentException` - if `streamSize` is less than zero, or `randomNumberOrigin` is not finite, or `randomNumberBound` is not finite, or `randomNumberOrigin` is greater than or equal to `randomNumberBound` Since: 1.8

### method:doubles(double,double) [NONE]
### doubles public DoubleStream doubles (double randomNumberOrigin, double randomNumberBound) Returns an effectively unlimited stream of pseudorandom `double` values, each conforming to the given origin (inclusive) and bound (exclusive). A pseudorandom `double` value is generated as if it's the result of calling the following method with the origin and bound:
     double nextDouble(double origin, double bound) {
       double r = nextDouble();
       r = r * (bound - origin) + origin;
       if (r >= bound) // correct for rounding
         r = Math.nextDown(bound);
       return r;
     }
Specified by: `doubles` in interface `RandomGenerator` Overrides: `doubles` in class `Random` Implementation Note: This method is implemented to be equivalent to `doubles(Long.MAX_VALUE, randomNumberOrigin, randomNumberBound)` . Parameters: `randomNumberOrigin` - the origin (inclusive) of each random value `randomNumberBound` - the bound (exclusive) of each random value Returns: a stream of pseudorandom `double` values, each with the given origin (inclusive) and bound (exclusive) Throws: `IllegalArgumentException` - if `randomNumberOrigin` is greater than or equal to `randomNumberBound` Since: 1.8