How to generate random integers in Java using nextInt() function of Random class

How to use the nextInt() function of the Random class in Java to generate random integers

Introduction:
In programming, we often encounter the need to generate random integers. Java provides the Random class to help us achieve this function. The nextInt() function can generate a random integer within a specified range. This article will introduce readers to how to use the nextInt() function of the Random class to generate random integers and give corresponding code examples.

1. Introduction to Random class:
   Random class is a core class in Java, which is used to generate pseudo-random numbers. The constructor of the Random class can accept a long type seed as a parameter to initialize the random number seed. If you do not set a seed, the default seed is used, usually the current system time.
2. How to use the nextInt() function:
   nextInt() function is a function in the Random class used to generate random integers. It has two overloaded versions:
   1) nextInt(): Generate a random integer of type int, ranging from -2^31 to 2^31-1.
   2) nextInt(int n): Generate a random integer of type int, ranging from 0 to n-1.
3. Code example of nextInt() function:
   The following is a code example of using the nextInt() function of the Random class to generate random integers:

import java.util.Random;

public class RandomExample {
    public static void main(String[] args) {
        // 创建一个 Random 类的实例
        Random random = new Random();

        // 生成一个范围在 -100 到 100 之间的随机整数
        int randomInt1 = random.nextInt(201) - 100;
        System.out.println("随机整数1：" + randomInt1);
        
        // 生成一个大于等于 0 小于 100 的随机整数
        int randomInt2 = random.nextInt(100);
        System.out.println("随机整数2：" + randomInt2);

        // 生成一个范围在 1 到 6 之间的随机整数，模拟掷骰子
        int randomInt3 = random.nextInt(6) + 1;
        System.out.println("随机整数3：" + randomInt3);
    }
}

4. Example analysis:
   In the above example, we first created an instance random of the Random class. Then three different random integers are generated through the random.nextInt() function and printed out. The first random integer range is between -100 and 100, that is, 201 - 100; the second random integer range is between 0 and 100; the third random integer range is between 1 and 6, simulating the dice rolling. scene.
5. Conclusion:
   By using the nextInt() function of the Random class, we can easily generate random integers within a specified range. In actual programming, we can select the appropriate range and parameters according to specific needs to generate random integers.

Summary:
This article introduces readers to how to use the nextInt() function of Java's Random class to generate random integers. After reading this article, readers should have a certain understanding of the basic usage of the Random class and be able to use the nextInt() function in their own code to generate random integers as needed. I hope this article can be helpful to readers.

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