How to use Random.nextInt() method to generate random numbers in Java?

How to use the Random.nextInt() method to generate random numbers in Java?

Random numbers are widely used in computer science and can be used to generate passwords, random events in games, random sampling in data science, etc. Java provides the Random class to generate random numbers, and the nextInt() method can be used to generate a random integer.

Below I will introduce how to use the Random.nextInt() method to generate random numbers and provide specific code examples.

First, we need to import the java.util.Random class:

import java.util.Random;

Next, we need to create a Random object in order to generate random numbers using its nextInt() method:

Random random = new Random();

Now, we can use the nextInt() method to generate random integers. This method can be used in two different ways.

1. If no parameters are passed in, the nextInt() method will generate a random number ranging from the minimum integer value to the maximum integer value (including the minimum and maximum values):

int randomNum1 = random.nextInt();

2. If an integer parameter n is passed in, the nextInt(n) method will generate a random number ranging from 0 to n-1:

int randomNum2 = random.nextInt(10);  // 生成一个0到9之间的随机数

Below is a complete sample code that will generate 5 random numbers ranging from 1 to 10 and print them out:

import java.util.Random;

public class RandomNumberGenerator {
    public static void main(String[] args) {
        Random random = new Random();

        for (int i = 0; i < 5; i++) {
            int randomNum = random.nextInt(10) + 1;  // 生成一个1到10之间的随机数
            System.out.println("随机数 #" + (i + 1) + ": " + randomNum);
        }
    }
}

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

随机数 #1: 7
随机数 #2: 4
随机数 #3: 10
随机数 #4: 3
随机数 #5: 6

In this way, we successfully generated random numbers using the Random.nextInt() method.

Summary:

The Random class in Java provides the nextInt() method for generating random integers. By creating a Random object and calling its nextInt() method, we can generate random numbers in different ranges. The nextInt() method without parameters will generate a random number between the minimum and maximum value of the integer; the nextInt(n) method with parameter n will generate a random number between 0 and n-1.

I hope this article can help you understand how to use the Random.nextInt() method to generate random numbers in Java and provide specific code examples. Happy programming!

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