Introduction to Arrays

By: aathishankaran Emailed: 1765 times Printed: 2515 times    

Latest comments
By: rohit kumar - how this program is work
By: Kirti - Hi..thx for the hadoop in
By: Spijker - I have altered the code a
By: ali mohammed - why we use the java in ne
By: ali mohammed - why we use the java in ne
By: mizhelle - when I exported the data
By: raul - no output as well, i'm ge
By: Rajesh - thanx very much...
By: Suindu De - Suppose we are executing

Introduction to Arrays


            Variables are used to hold data in memory. For every variable used, there should be and appropriate declaration. If 100 numbers are to be accepted, then 100 different variable declarations are required.


For example:


Integer a1,a2,a3.a4,…a100;


In many applications, more than 100 variables are required, in such cases, the entire task of variable declaration and working with the variables becomes quite inconvenient.


Arrays are the solution to this problem. They play an important role in problem-solving wherever a large number of variables are to be used.


An array is a group of elements that has a common name, and array elements are differentiated from one another by their positions within the array


Declaration Arrays


Arrays, like variable, should also be declared before being used, an array containing five elements, all of which are integers, can be declared as follow:


integer  Num_array[5];


The name of the array cannot be the same as that of any other variable declared within the same program the size of the array, specified by the number 5 within square brackets, indicates how many elements are to be allocated to the array Num_array.


As with regular variables, the declaration does not assign values; it reserves memory for the array, the dimension used to declare an array must always be a positive integer constant.


The array subscript number starts from 0. Thus, the elements in the array Num_array are:








The following statements assign values to each element of integer array called Num_array:


            Num_array[0] = 10;

            Num_array[1] = 20;

            Num_array[2] = 30;

            Num_array[3] = 40;

            Num_array[4] = 50;


Each element of an array can be referred anywhere in a program just like a variable.


An array name must be chosen according to the rules used for naming other variables.



Java Home | All Java Tutorials | Latest Java Tutorials

Sponsored Links

If this tutorial doesn't answer your question, or you have a specific question, just ask an expert here. Post your question to get a direct answer.

Bookmark and Share


Be the first one to add a comment

Your name (required):

Your email(required, will not be shown to the public):

Your sites URL (optional):

Your comments:

More Tutorials by aathishankaran
Web Security Issues
The Web User's Perspective
Server-side plug-Ins
The best way to avoid security vulnerabilities with new server
JavaScript Security
Window Object
Working with Status Bar Messages
Retrieving a Portion of a String
Referencing Windows
Math Object
Frame Object
Document Object
Closing Windows
Built-in Object in Javascript
Textarea Object

More Tutorials in Java
Update contents of a file within a jar file
Tomcat and httpd configured in port 8080 and 80
Java File
Java String
Count number of vowels, consonants and digits in a String in Java
Reverse a number in Java
Student marks calculation program in Java
Handling Fractions in Java
Calculate gross salary in Java
Calculate average sale of the week in Java
Vector in Java - Sample Program
MultiLevel Inheritance sample in Java
Multiple Inheritance sample in Java
Java program using Method Overriding
Java program to check if user input is an even number

More Latest News
Most Viewed Articles (in Java )
A Serialization Example in Java
Using One-Dimensional Arrays in Java
Method Overriding in Java
indexOf( ) and lastIndexOf( ) in Java
The java Buzzwords
Write to a file in Java - Sample Program
XML and Java - Parsing XML using Java Tutorial
Student marks calculation program in Java
Handling Fractions in Java
Calculate average sale of the week in Java
How to create an array and method in JSP
Type Casting in Java
How to use set, get basic and nested properties for Spring framework
How to access instance from an inner class and accessing outer class variables in java
Converting a number into its equalant value in words in Java
Most Emailed Articles (in Java)
Converting a number into its equalant value in words in Java
java.lang.reflect package
Disadvantages of using Native methods in Java
What is UCS? What is ISO 10646?
Generating Your Key Pair example using keytool in Java
Operator Precedence in Java
PushbackReader sample program in Java
concat(), replace(), and trim() Strings in Java
instanceof sample program in Java
Use of - new - in Java
The Benefits of OOP
Increment and Decrement Operator
Characters in java
The continuing Revolution of java
Why java is important to the Internet