Implementing Arrays in Java.

MatrixAddition.java

//Implementing Matrix Addition 

class MatrixMultiplication{
    public static void main(String[] args) {
        //Creating two matrices
        int[][] a = {{1,2,3},{2,3,4}};
        int[][] b = {{1,2,3},{2,3,4}};
        //Creating empty matrix to store the result
        int[][] sum = new int[2][3];

        //Printig the elements of the two dimensional array
        for (int i = 0; i < 2; i++) {
            for (int j = 0; j < 3; j++) {                
                sum[i][j] = a[i][j] + b[i][j];
                System.out.print(sum[i][j]+" ");
            }
            System.out.println(); //To go to new line
        }                            
    }
}

MultiDimensionalArray.java

//Implementing Two-Dimension Array 

class MultidimensionalArray{
    public static void main(String[] args) {
        //Defining two dimensional array
        int[][] array = new int[3][3]; 

        //Inserting elements into two dimensional array
        array[0][0] = 1;
        array[0][1] = 2;
        array[0][2] = 3;
        array[1][0] = 4;
        array[1][1] = 5;
        array[1][2] = 6;
        array[2][0] = 7;
        array[2][1] = 8;
        array[2][2] = 9;

        //Printig the elements of the two dimensional array
        for (int i = 0; i < array.length; i++) {
            for (int j = 0; j < array.length; j++) {
                System.out.print(array[i][j]+" ");        
            }
            System.out.println(); //To go to new line
        }    
    }
}

OneDimensionalArray.java

//Implementing Single-Dimension Array 

class Arrays{
    public static void main(String[] args) {
        //Defining an array of 5 elements
        int arr[] = new int[5]; 

        //Inserting elements into array
        arr[0] = 05; 
        arr[1] = 10;
        arr[2] = 15;
        arr[3] = 20;
        arr[4] = 25;
        //You can also define and insert elements into the element like below
        //int arr[] = {5,10,15,20,25}

        //Printing all the elements of the array
        //length is a pre-defined method of array class in Java which returns the length of an array.        
        for(int i=0; i<arr.length; i++){ 
            System.out.println(arr[i]);
        }
    }
}