How to generate different random numbers in java

1.java.lang.Math

In the Math class, the random method returns a double value in the range [0.0,1.0). The following code can get a random number between min and max:

int randomWithMathRandom = (int) ((Math.random() * (max - min)) + min);

2, java.util.Random

Before Java1.7, the most popular random number The generation method is nextInt. This method provides two versions: with parameters and without parameters. When called without parameters, nextInt can return any int value with similar probability, so negative numbers can be obtained:

Random random = new Random();
int randomWithNextInt = random.nextInt();

3. Java 8 introduces a new ints method that returns java.util. stream.IntStream, let's see how to use it.

The ints method without parameters will return an int stream:

IntStream unlimitedIntStream = random.ints();

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