Java generates random double precision floating point numbers using nextDouble() function of Random class

Java uses the nextDouble() function of the Random class to generate random double-precision floating-point numbers

The Random class in Java is a pseudo-random number generator that can be used to generate different types of random numbers. Among them, the nextDouble() function is used to generate a random double-precision floating point number.

Before using the Random class, we need to import the java.util package first. Next we can create a Random object and use the nextDouble() function to generate a random double-precision floating point number. The following is a sample code:

import java.util.Random;

public class RandomDemo {
    public static void main(String[] args) {
        Random random = new Random();
        double randomDouble = random.nextDouble();
        System.out.println("随机双精度浮点数: " + randomDouble);
    }
}

In this example, we first imported the java.util package, and then created a Random object random. Then call the nextDouble() function of random and assign the generated double-precision floating point number to the randomDouble variable. Finally, we use the System.out.println() function to print out the random number.

Run the above code and you will get an output similar to the following:

随机双精度浮点数: 0.725983783

Every time you run the program, you will get a different random double precision floating point number.

It should be noted that the random number generated by the nextDouble() function is a double-precision floating point number greater than or equal to 0 and less than 1. If we want to generate a random double precision floating point number within a specified range, we can use some simple mathematical operations. For example, if we want to generate a random double precision floating point number between 10 and 20, we can use the following code:

import java.util.Random;

public class RandomDemo {
    public static void main(String[] args) {
        Random random = new Random();
        double randomDouble = 10 + (20 - 10) * random.nextDouble();
        System.out.println("随机双精度浮点数: " + randomDouble);
    }
}

Run the above code and you will get a random double precision floating point number between 10 and 20 Double precision floating point number.

To summarize, the nextDouble() function of Java's Random class can generate random double-precision floating-point numbers, and the random numbers can be adapted to the required range through simple mathematical operations. By using the Random class properly, we can easily generate the random numbers we need in the program.

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