The java.util.Random class instance is used to generate a stream of pseudorandom numbers.Following are the important points about Random:
The class uses a 48-bit seed, which is modified using a linear congruential formula.
The algorithms implemented by class Random use a protected utility method that on each invocation can supply up to 32 pseudorandomly generated bits.
類聲明
以下是聲明java.util.Random class:
public class Random
extends Object
implements Serializable
類構造方法
| S.N. | 構造方法 & 詳細描述 |
|---|---|
| 1 | Random() This creates a new random number generator. |
| 2 | Random(long seed) This creates a new random number generator using a single long seed. |
類方法
| S.N. | 方法 & 描述 |
|---|---|
| 1 | protected int next(int bits) This method generates the next pseudorandom number. |
| 2 | boolean nextBoolean() This method returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence. |
| 3 | void nextBytes(byte[] bytes) This method generates random bytes and places them into a user-supplied byte array. |
| 4 | double nextDouble() This method returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence. |
| 5 | float nextFloat() This method returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence. |
| 6 | double nextGaussian() This method returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence. |
| 7 | int nextInt() This method returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence. |
| 8 | int nextInt(int n) This method returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence. |
| 9 | long nextLong() This method returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence. |
| 10 | void setSeed(long seed) This method sets the seed of this random number generator using a single long seed. |
方法繼承
此類從以下類繼承了上麵列出的方法
java.util.Object
