Iterations can be done in java

By: aathishankaran Emailed: 1769 times Printed: 2516 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

Iterations can be done in java


One of the most important characteristics of a computer is its ability to execute a series of instructions repeatedly. This cycle introduces the concept of loops, which allow the user great flexibility in controlling the number of times a specific task is to be repeated.



The while loop:


            A segment of coded that is executed repeatedly is called a loop. The loop concept is essential to good problem solving techniques. A few examples of repetitions are:


1        Adding the marks in three subjects for 150 students

2        Counting even numbers from a list of 2000 numbers


The following code accepts ten numbers, finds their sum and display result:




            integer Counter;

            integer Sum;

            integer Number;

            Counter = 0;

            Sum =0;

            while (Counter <10)


                        accept Number;

                        Sum =Sum + Number;

                        Counter = Counter+1;


            display Sum;

            display “Execution completed successfully.”;



How can Counter ever be equal to Counter+1? From an algebraic point of view, this makes no sense. But this is an assignment statement, not an algebraic statement. The same variable name Counter appears on both sides of the assignment operator. This means that each time the statement is executed, the old value (the one on the right)is incremented by 1. The result is stored in the same variable, the one that appears on the left of the assignment operator.


The general form of a while loop is as follows:








The loop operates in the following fashion:


The condition enclosed in parenthesis is evaluated, if the result is true, then the body of the loop is executed, then the condition is evaluated again, if it is again true, the body of the loop is executed again.


This process continues until the test condition becomes false. At hat point, the loop is terminated immediately, and program execution continues with the statement (if any) following the while loop, if there are no more statements, the program terminates. The condition specified in a while loop can be a compound condition using logical operators.


Consider the following program sequence:




                        integer Counter;

                        Counter = 1;

                        while (Counter<11)


                                    display ”This is line number”;

                                    display Counter;

                                    Counter = Counter+1;




The output of this program will be:


            This is line number            1

            This is line number            2

            This is line number            3

            This is line number            4

            This is line number            5

            This is line number            6

            This is line number            7

            This is line number            8

            This is line number            9

            This is line number            10


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 )
InetAddress Example program in Java
Read from a COM port using Java program
Stack example in Java - push(), pop(), empty(), search()
How to use ArrayList in Java
The Basic Structure of a Simple Java program
Using StringTokenizer in Java
FileReader and FileWriter example program in Java
Transient vs Volatile modifiers in Java
Vector example in Java
Method Overriding in Java
Method Overloading (function overloading) in Java
instanceof sample program in Java
append() in Java
Student marks calculation program in Java
Reading from a file and writing to a file using Java program
Most Emailed Articles (in Java)
Text to Speech conversion program in Java
inheritance in Java
How to initialize an Array and how to copy the array
Using Charts in JasperReports
What is Unicode?
Operator Precedence in Java
Of Object, equals (), == and hashCode ()
DateFormat sample program in Java
A Simple whois program in Java
PushbackReader sample program in Java
CharArrayReader example program in Java
ByteArrayOutputStream - sample program in Java
Vector example in Java
Arrays example in Java - asList(), binarySearch(), fill(), sort(), equals()
HashSet Sample program in Java