JAVA EE: Java Tutorial : Java Array (Types Of Array)

Tuesday 27 October 2015

Java Tutorial : Java Array (Types Of Array)

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Java Tutorial : Java Array (Types Of Array)

SingleDimensionalArrayDemo1.java

class SingleDimensionalArrayDemo1
{
    public static void main(String[] args)
    {
        int[] intArray = new int[5];// declaration and instantiation

        intArray[0] = 110;// initialization
        intArray[1] = 220;
        intArray[2] = 750;
        intArray[3] = 130;
        intArray[4] = 150;

        for (int i = 0; i < intArray.length; i++)
        {
            System.out.println("Element at index position " + i + " : " + intArray[i]);
        }
    }

}

Output

Element at index position 0 : 110
Element at index position 1 : 220
Element at index position 2 : 750
Element at index position 3 : 130
Element at index position 4 : 150

SingleDimensionalArrayDemo2.java

public class SingleDimensionalArrayDemo2
{

    public static void main(String[] args)
    {
        int intArray[] =
        { 51, 61, 89 };// declaration, instantiation and initialization

        for (int i = 0; i < intArray.length; i++)
        {
            System.out.println("Element at index position " + i + " : "
                    + intArray[i]);
        }
    }

}

Output

Element at index position 0 : 51
Element at index position 1 : 61
Element at index position 2 : 89

MultidimensionalArrayDemo1.java

public class MultidimensionalArrayDemo1
{

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

        intArray[0][0] = 1;
        intArray[0][1] = 2;
        intArray[0][2] = 3;
        intArray[1][0] = 4;
        intArray[1][1] = 5;
        intArray[1][2] = 6;
        
        int rows = intArray.length;

        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();
        }

    }

}

Output

Number of columns in row 0 is : 3
Element at intArray[0][0] : 1
Element at intArray[0][1] : 2
Element at intArray[0][2] : 3

Number of columns in row 1 is : 3
Element at intArray[1][0] : 4
Element at intArray[1][1] : 5
Element at intArray[1][2] : 6

MultidimensionalArrayDemo2.java

public class MultidimensionalArrayDemo2
{
    public static void main(String[] args)
    {
        /*
         * declare, instantiate, initialize
         */
        int[][] intArray =
        {
        { 1, 2, 3 },
        { 4, 5, 6 } };// 2 rows and 3 columns

        int rows = intArray.length;

        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();
        }

    }
}

Output

Number of columns in row 0 is : 3
Element at intArray[0][0] : 1
Element at intArray[0][1] : 2
Element at intArray[0][2] : 3

Number of columns in row 1 is : 3
Element at intArray[1][0] : 4
Element at intArray[1][1] : 5
Element at intArray[1][2] : 6