stanford.cs106.util

Class RandomGenerator

java.lang.Object

java.util.Random

acm.util.RandomGenerator

stanford.cs106.util.RandomGenerator

All Implemented Interfaces:

Serializable

public class RandomGenerator
extends RandomGenerator

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
RandomGenerator()
RandomGenerator(long seed)

Method Summary

Modifier and Type	Method and Description
static RandomGenerator	getInstance()
boolean	nextBoolean() Returns a random boolean value that is true or false with equal probability.
boolean	nextBoolean(double probability) Returns a random boolean value with the specified probability.
double	nextDouble()
double	nextDouble(double min, double max) Returns the next random real number in the specified range.
int	nextInt() Returns the next random integer, which can be any legal integer value.
int	nextInt(int max) Returns the next random integer between 0 and n-1, inclusive.
int	nextInt(int min, int max) Returns the next random integer in the specified range.
static void	rigBoolean(Boolean value)
static void	rigDouble(Double value)
static void	rigInt(Integer value)
static void	setAllSeed(Long seed)

Methods inherited from class acm.util.RandomGenerator

clearFixedIntegers, feedFixedIntegers, feedFixedIntegers, nextChoice, nextChoice, nextChoice, nextColor, setSharedSeed

Methods inherited from class java.util.Random

doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs, next, nextBytes, nextFloat, nextGaussian, nextLong, setSeed

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomGenerator

public RandomGenerator()

RandomGenerator

public RandomGenerator(long seed)

Method Detail

setAllSeed

public static void setAllSeed(Long seed)

getInstance

public static RandomGenerator getInstance()

rigBoolean

public static void rigBoolean(Boolean value)

rigDouble

public static void rigDouble(Double value)

rigInt

public static void rigInt(Integer value)

nextBoolean

public boolean nextBoolean()

Description copied from class: RandomGenerator

Returns a random boolean value that is true or false with equal probability. This method is in modern implementations of the Random class, but is missing from JDK 1.1.

Overrides:

nextBoolean in class RandomGenerator

nextBoolean

public boolean nextBoolean(double probability)

Description copied from class: RandomGenerator

Returns a random boolean value with the specified probability. You can use this method to simulate an event that occurs with a particular probability. For example, you could simulate the result of tossing a coin like this:

 
      String coinFlip = rgen.nextBoolean(0.5) ? "HEADS" : "TAILS";
 
 

Overrides:

nextBoolean in class RandomGenerator

Parameters:

probability - A value between 0 (impossible) and 1 (certain) indicating the probability

Returns:

The value true with probability p

nextDouble

public double nextDouble()

Overrides:

nextDouble in class Random

nextDouble

public double nextDouble(double min,
                         double max)

Description copied from class: RandomGenerator

Returns the next random real number in the specified range. The resulting value is always at least low but always strictly less than high. You can use this method to generate continuous random values. For example, you can set the variables x and y to specify a random point inside the unit square as follows:

 
      double x = rgen.nextDouble(0.0, 1.0);
      double y = rgen.nextDouble(0.0, 1.0);
 
 

Overrides:

nextDouble in class RandomGenerator

Parameters:

min - The low end of the range

max - The high end of the range

Returns:

A random double value d in the range low ≤ d < high

nextInt

public int nextInt()

Description copied from class: RandomGenerator

Returns the next random integer, which can be any legal integer value.

Overrides:

nextInt in class RandomGenerator

nextInt

public int nextInt(int max)

Description copied from class: RandomGenerator

Returns the next random integer between 0 and n-1, inclusive. This method is in modern implementations of the Random class, but is missing from JDK 1.1.

Overrides:

nextInt in class RandomGenerator

nextInt

public int nextInt(int min,
                   int max)

Description copied from class: RandomGenerator

Returns the next random integer in the specified range. For example, you can generate the roll of a six-sided die by calling

 
      rgen.nextInt(1, 6);
 
 

or a random decimal digit by calling

 
      rgen.nextInt(0, 9);
 
 

Overrides:

nextInt in class RandomGenerator

Parameters:

min - The low end of the range

max - The high end of the range

Returns:

The next random int between low and high, inclusive