How to create an array of 100 random numbers Java?

Here's how to create an array of 100 random numbers in Java, along with explanations and an example based on the provided reference:

Approach

The basic approach involves the following steps:

Declare and initialize an array of integers with a size of 100.
Use a loop to iterate through each element of the array.
Generate a random number within the desired range in each iteration.
Assign the random number to the current element of the array.

Example Code and Explanation

import java.util.Random;

public class RandomArray {
    public static void main(String[] args) {
        // 1. Declare and initialize an array of 100 integers.
        int[] array = new int[100];

        // 2. Create a Random object to generate random numbers.
        Random random = new Random();

        // 3. Loop through the array and assign random numbers.
        for (int i = 0; i < 100; i++) {
            // Generate a random integer between 0 (inclusive) and 1000 (exclusive). You can adjust this as needed.
            int randomNumber = random.nextInt(1000);  //Generates numbers from 0-999

            // Assign the random number to the array element.
            array[i] = randomNumber;
        }

        // 4. Print the array (optional, for verification).
        System.out.println("Array of 100 Random Numbers:");
        for (int i = 0; i < 100; i++) {
            System.out.print(array[i] + " ");
        }
        System.out.println();
    }
}

Explanation

import java.util.Random;: This line imports the Random class, which is necessary for generating random numbers.
int[] array = new int[100];: This line declares an integer array named array and initializes it with a size of 100. This means the array can hold 100 integer values. This is point 5 in the referenced material.
Random random = new Random();: This line creates an instance of the Random class. You'll use this random object to generate your random numbers.
for (int i = 0; i < 100; i++) { ... }: This for loop iterates 100 times, once for each element in the array. This is point 6 in the referenced material.
int randomNumber = random.nextInt(1000);: This line generates a random integer between 0 (inclusive) and 1000 (exclusive). The nextInt(1000) method returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and 1000 (exclusive). You can change the 1000 to any other number to change the range of random numbers generated.
array[i] = randomNumber;: This line assigns the generated randomNumber to the i-th element of the array.

Customizing the Range

To generate random numbers within a specific range (e.g., between min and max inclusive), you can use the following formula:

int randomNumber = random.nextInt(max - min + 1) + min;

For example, to generate random numbers between 1 and 999 (inclusive):

int min = 1;
int max = 999;
int randomNumber = random.nextInt(max - min + 1) + min;

Important Notes

The Random class generates pseudorandom numbers. These are suitable for most general-purpose tasks.
For security-sensitive applications, consider using java.security.SecureRandom for generating cryptographically secure random numbers.

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