Java中的Random类

最新推荐文章于 2025-01-08 16:14:42 发布

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#random #java #generator #constructor #float #byte

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博客展示了Java中使用Random类生成随机数的实例。通过创建Random对象，调用其不同方法可生成任意大小的随机整数、布尔值、双精度浮点数、单精度浮点数、长整数等，还能生成指定范围的随机整数，每次运行结果随机。

Constructor Summary
`Random()` Creates a new random number generator.
`Random(long seed)` Creates a new random number generator using a single `long` seed:

Method Summary
`protected int`	`next(int bits)` Generates the next pseudorandom number.
`boolean`	`nextBoolean()` Returns the next pseudorandom, uniformly distributed `boolean` value from this random number generator's sequence.
`void`	`nextBytes(byte[] bytes)` Generates random bytes and places them into a user-supplied byte array.
`double`	`nextDouble()` Returns the next pseudorandom, uniformly distributed `double` value between `0.0` and `1.0` from this random number generator's sequence.
`float`	`nextFloat()` Returns the next pseudorandom, uniformly distributed `float` value between `0.0` and `1.0` from this random number generator's sequence.
`double`	`nextGaussian()` 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.
`int`	`nextInt()` Returns the next pseudorandom, uniformly distributed `int` value from this random number generator's sequence.
`int`	`nextInt(int n)` Returns a pseudorandom, uniformly distributed `int` value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.
`long`	`nextLong()` Returns the next pseudorandom, uniformly distributed `long` value from this random number generator's sequence.
`void`	`setSeed(long seed)` Sets the seed of this random number generator using a single `long` seed.

使用实例：
import java.util.Random;
public class RandomNum{
public static void main(String[] args) {
      Random ran=new Random();
        System.out.println(ran.nextInt());//产生任意大小的随机整数
        System.out.println(ran.nextBoolean());//
        System.out.println(ran.nextDouble());//
        System.out.println(ran.nextFloat());//
        System.out.println(ran.nextLong());//
        System.out.println(ran.nextInt(100));//产生0至100的随机整数
}
}

结果：
-1116918815
false
0.3570466757532643
0.69238234
7423008150361503085
88

由于结果是随记的每次运行的结果不同