Source Code : Java program to demonstrate multidimensional arrays

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Java program to demonstrate multidimensional arrays

     
/*
Java Programming for Engineers
Julio Sanchez
Maria P. Canton


ISBN: 0849308100
Publisher: CRC Press
*/


// File name: MultiArray.java
//Reference: Chapter 6
//
//Java program to demonstrate multidimensional arrays
//Topics:
// 1. Simultaneous declaration and initialization
// 2. Use of the length operator to obtain the size
//    of multidimensional arrays

public class MultiArray {
  // Declare constants
  final static int ROWS = 10;

  final static int COLS = 5;

  public static void main(String[] args) {

    // Local varaibles
    int rowCount;
    int colCount;
    int totalSize;

    // Declare and allocate an array of bytes
    byte[][] screenPix = new byte[ROWS][COLS];

    // Obtain and store array dimensions
    rowCount = screenPix.length;
    colCount = screenPix[COLS].length;
    totalSize = rowCount * colCount;

    // To obtain the total number of elements of a
    // two-dimensional ragged array you need to get the size of
    // each array dimension separately

    // Display array dimensions
    System.out.println("Array row size:    " + rowCount);
    System.out.println("Array column size: " + colCount);
    System.out.println("Total size:        " + totalSize);

    //*************************
    //      ragged arrays
    //*************************
    // First allocate the rows of an array
    byte[][] raggedArray = new byte[5][];

    // Now allocate the columns
    raggedArray[0] = new byte[2];
    raggedArray[1] = new byte[2];
    raggedArray[2] = new byte[4];
    raggedArray[3] = new byte[8];
    raggedArray[4] = new byte[3];

    // The resulting ragged array is as follows:
    //  x x
    //  x x
    //  x x x x
    //  x x x x x x x x
    //  x x x

    //************************************
    //     static array initialization
    //************************************
    byte[][] smallArray = { { 10, 11, 12, 13 }, { 20, 21, 22, 23 },
        { 30, 31, 32, 33 }, { 40, 41, 42, 43 }, };

    // Display the array element at row 2, column 3
    System.out.println(smallArray[1][2]); // Value is 21
  }
}


           
         
    
    
    
    
  

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