Multi dimension array java

Multi Dimensional Array In Java – Tutorial & Program

Multi-dimensional Array in Java Programming – In this article, we will brief in on all the possible ways to evaluate multi-dimensional arrays in Java Programming with sample program. In case if you have any doubts about this tutorial do leave a comment here.

All the methods will be explained with sample programs and suitable examples. The compiler has also been added so that you understand the whole thing clearly.

The methods used in this article are as follows:

An array, as we all know, is a collection of multiple elements of the same data type. Arrays are normally used to store information of one particular type of variable.

As the name of the title suggests, multi-dimensional means any particular entity having 3 or more than 3 dimensions in reality.

Similarly, a multi-dimensional array in Java usually has 3 or more defined indexes, but in reality, one particular row of elements have another multitude of elements defined on their names.

Basically, you can have a 3×3 or a bigger matrix of elements to define a multi-dimensional array.

As you can see as per the image uploaded above, firstly, you need to specify the number of rows and columns respectively.

The example roughly explains the structure of a 3×4 matrix.

So, the total number of elements that will be entered is 12.

The elements that are entered are as follows:

1 2 3 4 5 6 7 8 9 10 11 12

These elements will be arranged accordingly and the multi-dimensional array will be printed for you.

Thus, the numerous methods that are used to carry out the same task in Java are:

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Multi dimension array java

• Introduction to Java
• The complete History of Java Programming Language
• C++ vs Java vs Python
• How to Download and Install Java for 64 bit machine?
• Setting up the environment in Java
• How to Download and Install Eclipse on Windows?
• JDK in Java
• How JVM Works – JVM Architecture?
• Differences between JDK, JRE and JVM
• Just In Time Compiler
• Difference between JIT and JVM in Java
• Difference between Byte Code and Machine Code
• How is Java platform independent?

• Decision Making in Java (if, if-else, switch, break, continue, jump)
• Java if statement with Examples
• Java if-else
• Java if-else-if ladder with Examples
• Loops in Java
• For Loop in Java
• Java while loop with Examples
• Java do-while loop with Examples
• For-each loop in Java
• Continue Statement in Java
• Break statement in Java
• Usage of Break keyword in Java
• return keyword in Java

• Object Oriented Programming (OOPs) Concept in Java
• Why Java is not a purely Object-Oriented Language?
• Classes and Objects in Java
• Naming Conventions in Java
• Java Methods
• Access Modifiers in Java
• Java Constructors
• Four Main Object Oriented Programming Concepts of Java
• Inheritance in Java
• Abstraction in Java
• Encapsulation in Java
• Polymorphism in Java
• Interfaces in Java
• ‘this’ reference in Java

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Java Multidimensional Arrays

Before we learn about the multidimensional array, make sure you know about Java array.

A multidimensional array is an array of arrays. Each element of a multidimensional array is an array itself. For example,

Here, we have created a multidimensional array named a . It is a 2-dimensional array, that can hold a maximum of 12 elements,

Remember, Java uses zero-based indexing, that is, indexing of arrays in Java starts with 0 and not 1.

Let’s take another example of the multidimensional array. This time we will be creating a 3-dimensional array. For example,

String[][][] data = new String[3][4][2];

Here, data is a 3d array that can hold a maximum of 24 (3*4*2) elements of type String .

How to initialize a 2d array in Java?

Here is how we can initialize a 2-dimensional array in Java.

As we can see, each element of the multidimensional array is an array itself. And also, unlike C/C++, each row of the multidimensional array in Java can be of different lengths.

Example: 2-dimensional Array

class MultidimensionalArray < public static void main(String[] args) < // create a 2d array int[][] a = < , , , >; // calculate the length of each row System.out.println("Length of row 1: " + a[0].length); System.out.println("Length of row 2: " + a[1].length); System.out.println("Length of row 3: " + a[2].length); > >

Length of row 1: 3 Length of row 2: 4 Length of row 3: 1

In the above example, we are creating a multidimensional array named a . Since each component of a multidimensional array is also an array ( a[0] , a[1] and a[2] are also arrays).

Here, we are using the length attribute to calculate the length of each row.

Example: Print all elements of 2d array Using Loop

class MultidimensionalArray < public static void main(String[] args) < int[][] a = < , , , >; for (int i = 0; i < a.length; ++i) < for(int j = 0; j < a[i].length; ++j) < System.out.println(a[i][j]); >> > >

We can also use the for. each loop to access elements of the multidimensional array. For example,

class MultidimensionalArray < public static void main(String[] args) < // create a 2d array int[][] a = < , , , >; // first for. each loop access the individual array // inside the 2d array for (int[] innerArray: a) < // second for. each loop access each element inside the row for(int data: innerArray) < System.out.println(data); >> > >

In the above example, we are have created a 2d array named a . We then used for loop and for. each loop to access each element of the array.

How to initialize a 3d array in Java?

Let’s see how we can use a 3d array in Java. We can initialize a 3d array similar to the 2d array. For example,

// test is a 3d array int[][][] test = < < , >, < , , > >;

Basically, a 3d array is an array of 2d arrays. The rows of a 3d array can also vary in length just like in a 2d array.

Example: 3-dimensional Array

class ThreeArray < public static void main(String[] args) < // create a 3d array int[][][] test = < < , >, < , , > >; // for..each loop to iterate through elements of 3d array for (int[][] array2D: test) < for (int[] array1D: array2D) < for(int item: array1D) < System.out.println(item); >> > > >

1 -2 3 2 3 4 -4 -5 6 9 1 2 3

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