How To Generate Random Integer Within A Specific Range In Java

nextDouble()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

random.nextDouble() 生成0-1的随机数. 所以我们已知：生成0 到1 的小数我们可以采用 // 2.判断在范围内if(v < 0.3 && v > 0.1) 让数据生成更加集中。

The method nextDouble is implemented by class Random as if by: public double nextDouble() { return (((long)next(26) << 27) + next(27)) / (double)(1L << 53); }. Uses of Class java.util.Random · Math · ThreadLocalRandom · Fra

Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.

Random.NextDouble 方法 定義 傳回大於或等於 0.0,且小於 1.0 的隨機浮點數。 public: virtual double NextDouble();

If you are using JDK version 17 or later, you will find the method you're referring to. This method isn't mentioned in the JDK 8 ...

The nextDouble() method of Random class returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator ...

java.util 類別Random ; double, nextDouble() 返回下一個偽隨機數(亂數)，它是取自此隨機數產生器序列的、在 0.0 和 1.0 之間均勻分佈的 double 值。 ; float, nextFloat()

Reports calls to java.util.Random.nextDouble() that are used to create a positive integer number by multiplying the call by a factor and casting to an integer.

The java Random nextDouble() method is used to get the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number ...