Arrays

Arrays are used to store multiple values in a single variable, instead of declaring separate variables for each value.

To declare an array, define the variable type with square brackets:

Example:

String[] cars = {"Volvo", "BMW", "Ford", "Mazda"};

//or

int[] myNum = {10, 20, 30, 40};

Access the Elements of an Array:

public class Main {

  public static void main(String[] args) {

    String[] cars = {"Volvo", "BMW", "Ford", "Mazda"};

    System.out.println(cars[0]);

  }

}

Loop Through an Array:

public class Main {

  public static void main(String[] args) {

    String[] cars = {"Volvo", "BMW", "Ford", "Mazda"};

    for (String i : cars) {

      System.out.println(i);

    }    

  }

}

Access Elements

public class Main {

  public static void main(String[] args) {

    int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} };

    System.out.println(myNumbers[1][2]);  

  }

}//output is 7

Change Element Values

public class Main {

  public static void main(String[] args) {

    int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} };

    myNumbers[1][2] = 9;

    System.out.println(myNumbers[1][2]); // Outputs 9 instead of 7

  }

}

Loop Through a Multi-Dimensional Array:

public class Main {

   public static void main(String[] args) {

     int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} };

     for (int i = 0; i < myNumbers.length; ++i) {

        for(int j = 0; j < myNumbers[i].length; ++j) {

           System.out.println(myNumbers[i][j]);

        }

     }

   }

}