How To Loop Over Ii Dimensional Array Inwards Java?

You tin flaming loop over a two-dimensional array inwards Java yesteryear using two for loops, likewise known as nested loop. Similarly to loop an n-dimensional array you lot necessitate n loops nested into each other. Though it's non mutual to come across an array of to a greater extent than than three dimension as well as 2D arrays is what you lot volition come across most of the places. It's i of the most useful information construction inwards the programming world. You tin flaming purpose a two-dimensional array to brand finite soil machine (FSM) solve soil based problems, you lot tin flaming purpose a 2D array to create board games similar Chess, Sudoku as well as Tic-Tac-To as well as you lot tin flaming fifty-fifty purpose a two-dimensional array to create 2D arcade games e.g. Tetris, Super Mario Bros as well as hence on. Whatever you lot come across on your covert is nil but a 2D array which is populated using tiles.

In social club to brand purpose of the 2D array, you lot must know how to populate as well as iterate over it as well as that's what you lot volition larn inwards this article. You tin flaming scream upward almost 2 dimensional array as a matrix which has rows as well as columns, this assistance to visualize contents of an array. In social club to loop over a 2D array, nosotros commencement acquire through each row as well as and then i time again nosotros acquire through each column inwards every row. That's why nosotros necessitate 2 loops, nested inwards each other.

Anytime, if you lot desire to come upward out of nested loop, you lot tin flaming purpose the interruption statement. If you lot are an absolute beginner as well as but started alongside programming, I recommend reading Head First Programming first. Once you lot went through the book, most of the programming concept e.g. array, string, vector volition brand feel to you.

Java Program to Loop over 2D Array inwards Java

Here is a Java programme to iterate over a 2 dimensional array inwards Java using traditional for loop. Though it's non necessary to purpose for loop, you lot tin flaming fifty-fifty purpose piece loop or advanced for loop inwards Java, it makes feel to start alongside this simplest of programming construct.

In this example, nosotros convey commencement created a 2 dimensional array of size 4x4, which agency iv rows as well as iv columns. Then nosotros convey looped over it 2 times, commencement fourth dimension to populate the array alongside integer values as well as the instant fourth dimension to acquire through each index as well as impress their values.

It's non necessary to start looping from commencement chemical component division e.g. [0, 0] which is commencement row as well as commencement column but if you lot desire to demeanour upon every chemical component division this is the correct house to start.

Here is the code to loop over 2D array inwards Java :

 for (int row = 0; row < board.length; row++) {     for (int col = 0; col < board[row].length; col++) {        board[row][col] = row * col;     }  }

You tin flaming come across that outer loop is going through each row as well as the inner loop is going through each column, this way nosotros acquire over all elements. In the commencement iteration, all elements of the commencement row are processed, but similar iterating over i dimensional array.

Here is the consummate programme :

Looping over 2D array inwards Java

/**  * Java Program to demonstrate how to loop over two-dimensional array.  * We commencement loop to populate the array as well as after to impress values.   *   * @author WINDOWS 8  */ public class TwoDimensionalArrayDemo{      public static void main(String args[]) {          // let's create board of 4x4         int[][] board = new int[4][4];          // let's loop through array to populate board         for (int row = 0; row < board.length; row++) {             for (int col = 0; col < board[row].length; col++) {                 board[row][col] = row * col;             }         }          // let's loop through array to impress each row as well as column         for (int row = 0; row < board.length; row++) {             for (int col = 0; col < board[row].length; col++) {                 board[row][col] = row * col;                 System.out.print(board[row][col] + "\t");             }             System.out.println();         }     }  }

Output :

0   0   0   0    0   1   2   3    0   2   4   6    0   3   6   9    

BTW, Java doesn't actually convey multi-dimensional arrays, instead, you lot convey arrays of arrays (of arrays ...). So, if you lot desire to loop through the commencement array, you lot enquire for "board[0].length", if you lot desire to loop through the instant array, you lot enquire for "board[1].length".

As I told you, a multi-dimensional array is i of the pop information construction as well as tin flaming locomote used to stand upward for board games e.g. Chess, Ludo, Sudoku, Tetris as well as likewise every bit useful to depict terrains inwards tile based games. In fact, it is i of the most useful information construction inwards game programming. Another natural purpose of a multi-dimensional array is inwards matrix maths e.g. matrix multiplication, adding 2 matrices, transposing matrices etc.

You tin flaming extend this technique to loop through the multi-dimensional array inwards Java. You volition but necessitate as many loops as many dimension your array has. Remember, you lot tin flaming declare a two-dimensional array inwards Java without specifying the length of the instant dimension.

Further Learning
Data Structures as well as Algorithms: Deep Dive Using Java
here)

22 Array concept Interview Questions inwards Java (see here)

How to impress array values inwards Java? (example)

How to compare 2 arrays inwards Java? (example)

Data Structures as well as Algorithm Analysis inwards Java (see here)

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