Question

Write a java program that create a 2 dimensional array of type double of size 10 by 10.

Fill the array with random numbers using a random number generator.

Print the array contents.

Write a java program that creates a file called data.txt that uses the PrintWriter class.

Write the numbers 1 to 42 into the file. Close the file. Attach both files.

Thank you in advance

Answer 1

import java.util.Random;

public class RandomMatric {

    public static void main(String[] args) {
        Random random = new Random();
        int[][] matrix = new int[10][10];
        for (int i = 0; i < 10; i++) {
            for (int j = 0; j < 10; j++) {
                matrix[i][j] = random.nextInt(1000);
            }
        }
        // print array
        for (int i = 0; i < 10; i++) {
            for (int j = 0; j < 10; j++) {
                System.out.print(matrix[i][j] + " ");
            }
            System.out.println();
        }
    }
}

import java.io.FileNotFoundException;
import java.io.PrintWriter;

public class WriteFile42 {

    public static void main(String[] args) throws FileNotFoundException {
        PrintWriter pw = new PrintWriter("data.txt");
        for (int i = 1; i <= 42; i++) {
            pw.println(i);
        }
        pw.close();
    }
}