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📜  Java.util.Random类

📅  最后修改于: 2020-11-14 06:22:02             🧑  作者: Mango

介绍

java.util.Random类实例用于生成伪随机数流。以下是有关Random的要点-

  • 该类使用48位种子，可以使用线性同余公式对其进行修改。

  • 由Random类实现的算法使用一种受保护的实用程序方法，该方法在每次调用时最多可以提供32个伪随机生成的位。

类声明

以下是java.util.Random类的声明-

public class Random
   extends Object
   implements Serializable

类的构造函数

Sr.No. Constructor & Description
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.

类方法

Sr.No. Method & Description
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.

方法继承

此类从以下类继承方法-

  • java.util.Object