Explain declaring- allocating and initializing two dimension, JAVA Programming

Assignment Help:

Explain the following terms declaring, Allocating and initializing two dimensional array?

Two dimensional arrays are declared, allocated and initialized much such as one dimensional arrays. Therefore you have to specify two dimensions rather than one, and you classically use two nested for loops to fill the array.

This example fills a two-dimensional array along with the sum of the row and column indexes

class FillArray {
   public static void main (String args[]) {
      int[][] matrix;
    matrix = new int[4][5];
      for (int row=0; row < 4; row++) {
      for (int col=0; col < 5; col++) {
        matrix[row][col] = row+col;
      }
    }
      }
  }

Of course the algorithm you use to fill the array depends fully on the use to that the array is to be put. The further example calculates the identity matrix for a given dimension. The identity matrix of dimension N is a square matrix that contains ones along the diagonal and zeros in all other positions.

class IDMatrix {
   public static void main (String args[]) {
      double[][] id;
    id = new double[4][4];
      for (int row=0; row < 4; row++) {
      for (int col=0; col < 4; col++) {
        if (row != col) {
          id[row][col]=0.0;
        }
        else {
          id[row][col] = 1.0;
        }
      }
    }
      }
  }

In two-dimensional arrays ArrayIndexOutOfBoundsExceptions occur while you exceed the maximum column index or row index.

You can also allocate, declare, and initialize a a two-dimensional array at the similar time through providing a list of the initial values inside nested brackets. For example the three by three identity matrix could be set up like this:

double[][] ID3 = {
  {1.0, 0.0, 0.0},
  {0.0, 1.0, 0.0},
  {0.0, 0.0, 1.0}
};

The spacing and the line breaks used above are purely for the programmer. The compiler doesn't care. The subsequent works equally well:

double[][] ID3 = {{1.0, 0.0, 0.0},{0.0, 1.0, 0.0},{0.0, 0.0, 1.0}};


Related Discussions:- Explain declaring- allocating and initializing two dimension

Relate java with C/C++, Relate Java with C/C++ Very similar C/C++ synta...

Relate Java with C/C++ Very similar C/C++ syntax, operators, etc. Core language is simpler than C++ -- no pointers, no operator overloading, and no multiple inheritance.

Bi-lingual site for the mitzpe apiary, Bi-lingual site for the Mitzpe apiar...

Bi-lingual site for the Mitzpe apiary Project Description: We require a bi-lingual website built in 14 days. The Mitzpe Apiary is a new company that was started by local e

Solve neural network questions, Solve Neural Network Questions Project D...

Solve Neural Network Questions Project Description: You must know  Binary Chop and Kohonen Network, Backpropagation Algorithm. Implementation is required. Can using existi

Differentiate between onload and onunload, Differentiate between onLoad and...

Differentiate between onLoad and onUnload? Onload executes the particular javascript code when a latest document is loaded into a windows. ONUnload executes he particular javas

Describe in brief about the polymorphism, Describe Polymorphism? Polymo...

Describe Polymorphism? Polymorphism can be referred as one name many forms. It's the ability of methods to behave differently, depending upon object who is calling it. Key feat

Applet program, file download from server using applet and tomcat server

file download from server using applet and tomcat server

Java is object oriented programme language, Java is Object oriented program...

Java is Object oriented programme language Java is comprehensively OOP language with robust memory system Memory errors largely disappear due to safe pointers and garbage c

What is bandwidth, What is bandwidth? In a general way Bandwidth is a c...

What is bandwidth? In a general way Bandwidth is a capacity of communication channel of carrying data.

Code, pebble merchant

pebble merchant

Why the number of temporary workers is on the rise, Why the number of tempo...

Why the number of temporary workers is on the rise? Discuss main reasons? Temporary workers: Temporary workers are those workers that a company can hire to perform a certain ta

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd