Click here to watch in Youtube :
https://www.youtube.com/watch?v=LiBK0ZZljt0&list=UUhwKlOVR041tngjerWxVccw

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ArrayDemo.java

class ArrayDemo
{
    public static void main(String[] args)
    {
        int[][] intArray = new int[2][3];

        intArray[0][0] = 10;
        intArray[0][1] = 20;
        intArray[0][2] = 30;

        intArray[1][0] = 100;
        intArray[1][1] = 200;
        intArray[1][2] = 300;

        System.out.println("Element at intArray[0][0] : " + intArray[0][0]);
        System.out.println("Element at intArray[0][1] : " + intArray[0][1]);
        System.out.println("Element at intArray[0][2] : " + intArray[0][2]);

        System.out.println();

        System.out.println("Element at intArray[1][0] : " + intArray[1][0]);
        System.out.println("Element at intArray[1][1] : " + intArray[1][1]);
        System.out.println("Element at intArray[1][2] : " + intArray[1][2]);

    }
}

Output

Element at intArray[0][0] : 10
Element at intArray[0][1] : 20
Element at intArray[0][2] : 30

Element at intArray[1][0] : 100
Element at intArray[1][1] : 200
Element at intArray[1][2] : 300

public class ArrayLoopDemo
{

    public static void main(String[] args)
    {
        int[][] intArray = new int[2][3];

        intArray[0][0] = 10;
        intArray[0][1] = 20;
        intArray[0][2] = 30;

        intArray[1][0] = 100;
        intArray[1][1] = 200;
        intArray[1][2] = 300;

        int rows = intArray.length;

        System.out.println("Number of rows : " + rows+"\n");
        
        for (int i = 0; i < rows; i++)
        {
            int columns = intArray[i].length;
            
            System.out.println("Number of columns in row "+ i +" is : " + columns);
            
            for (int j = 0; j < columns; j++)
            {
                System.out.println("Element at " + "intArray[" + i + "]" + "["
                        + j + "] : " + intArray[i][j]);

            }
            System.out.println();
        }

    }

}