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Overview

The Main class contains the entry point for the Actividad-1 application. It demonstrates array operations, user input handling, and basic statistical calculations in Java.

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Class Declaration

Main.java:3
public class Main {
    public static void main(String[] args) {
        // Implementation
    }
}
The class follows the standard Java application structure with a single public static void main(String[] args) method.

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Imports

Main.java:1
import java.util.Scanner; // Importa scanner para leer datos de entradad del usuario
The program imports the Scanner class from java.util package to handle user input from the console. The Scanner provides methods like nextInt() for reading integer values.

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Variable Declarations

The program declares three integer arrays, each with a fixed size of 7 elements:
Main.java:7-9
int[] array1 = new int[7]; // Se crea el primer arreglo
int[] array2 = new int[7]; // Se crea el segundo arreglo
int[] arrayDiferencia = new int[7];
  • array1: Stores the first set of user inputs
  • array2: Stores the second set of user inputs
  • arrayDiferencia: Stores the calculated differences between corresponding elements
Main.java:5
Scanner sc = new Scanner(System.in);
Creates a Scanner object connected to standard input (System.in) for reading user keyboard input throughout the program.
Main.java:11-12
int sumaTotal = 0;
int totalElementos = array1.length * 2;
  • sumaTotal: Accumulator variable that stores the sum of all elements from both arrays (initialized to 0)
  • totalElementos: Total count of elements across both arrays, calculated as 7 * 2 = 14
These variables are used later to calculate the average of all input values.

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Complete Source Code

Main.java
import  java.util.Scanner; // Importa scanner para leer datos de entradad del usuario

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int[] array1 = new int[7]; // Se crea el primer arreglo
        int[] array2 = new int[7]; // Se crea el segundo arreglo
        int[] arrayDiferencia = new int[7];

        int sumaTotal = 0;
        int totalElementos = array1.length * 2;

        System.out.println("Ingrese 7 valores para el primer arreglo");
        for (int i = 0; i < array1.length; i++) {
            System.out.print("Valor " + (i + 1) + ": ");
            array1[i] = sc.nextInt();
            sumaTotal += array1[i];
        }

        System.out.println("Ingrese 7 valores para el segundo arreglo");
        for (int i = 0; i < array1.length; i++) {
            System.out.print("Valor " + (i + 1) + ": ");
            array2[i] = sc.nextInt();
            sumaTotal += array1[i];
        }

        // Diferencia
        for (int i = 0; i < array1.length; i++) {
            arrayDiferencia[i] = array1[i] - array2[i];
        }

        // Promedio
        double promedio = (double) sumaTotal / totalElementos;

        System.out.printf("El promedio es: %.2f", promedio);

        System.out.println("\nArreglo de diferencias");
        for (int i = 0; i < arrayDiferencia.length; i++) {
            System.out.println("Posición" + i + ":" + arrayDiferencia[i]);
        }
        sc.close();
    }
}

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Line-by-Line Explanation

This section provides a detailed walkthrough of the Main class implementation.
LinesDescription
1Imports the Scanner class for reading console input
3-4Declares the Main class and main method
5Initializes Scanner object for user input
7-9Declares three integer arrays of size 7
11Initializes sum accumulator to 0
12Calculates total element count (14)
14-19First input loop: reads 7 values into array1 and accumulates sum
21-26Second input loop: reads 7 values into array2
29-31Calculates element-wise differences (array1[i] - array2[i])
34Computes average using explicit double casting
36Prints formatted average with 2 decimal places
38-41Displays the difference array elements
42Closes the Scanner resource

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Resource Management

Main.java:42
sc.close();
The Scanner is properly closed at the end of the program to release system resources. This is a best practice when working with I/O resources.

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See Also

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