A while loop statement in Java programming language repeatedly executes a target statement as long as a given condition is true. acknowledge that you have read and understood our When “i” becomes 11 the condition return false and loop will be terminated printing numbers starting from one to ten in output screen. You will have to close the output window and restart the program execution. ALL RIGHTS RESERVED.

It executes only of the condition is met.According to the condition given in a while loop Boolean values are outputted. The syntax for this is provided below:Below is the workflow diagram of the while loop. The condition may be any expression, and true is any non zero value.

The difference between these loops is of Syntax and the condition checking time. do { // Statements }while(Boolean_expression); Notice that the Boolean expression appears at the end of the loop, so the statements in the loop execute once before the Boolean is tested. If the Boolean expression is true, the control jumps back up to do statement, and the statements in the loop … Here, statement(s) may be a single statement or a block of statements. Here variable “i” is initialized with 1. While loop can be considered as repeated If loop.

Hence we should be very careful when working with a while loop and give proper terminating condition otherwise the loop will run into an infinite loop.Note: You can paste this code in “notepad” with extension .java.This is a simple program to iterate 10 times and print the numbers from 1 to 10. This loop will simply be executed without affecting data in the program. If there is no requirement as such to have a fixed number of iterations then we use while loop instead of other loops. If you have read the previous chapter, about the for loop, you will discover that a while loop is much the same as a for loop, with statement 1 and statement 3 omitted. If the resultant Boolean value is true then the loop will be executed otherwise control will flow out of loop thereby terminating the while loop. The “i” is incremented by one (because of i++) every time the loop is executed. One of the loops provided by JAVA is while loop. This loop will continuously execute until the condition becomes false.Here, after a while keyword, we give condition in brackets. The while loop can be thought of as a repeating if statement. Since we are using System.out.println to print the numbers, here “ln” after print ensures that every number I printed in the next line. Although it can be used in case we deliberately want to delay the execution of the program.6) We should not use a semicolon after the condition in a while loop. “i” is compared as precondition written (which is “i” should be less than or equal to 10). All the loops provide similar functionality. The loop in this example uses a for loop to collect the car names from the cars array:

Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. It is advisable not to have empty while loops since it delays the execution time of the program. However, the reverse is not true.4) While it is an entry controlled loop. In this tutorial, we learn to use it with examples. The condition corresponding to Below are some of the code snippets which demonstrate the use of while loopThis loop is an infinite loop because we have hardcoded True (1) here. In Java, a while loop is used to execute statement(s) until a condition is true. Once the condition returns false in a while loop, the control will come out of the loop. If we would have used print instead of println then the numbers would have printed in the same line without spaces.1) Initialize every variable you are using in a while loop. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS.This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. Syntax: while (test_expression) { // statements update_expression; } This will throw an error.7) Break and continue statements followed by semi-colon can be used under a while loop. Comparing For and While. Attention reader! When the main program is executed and the program encounters a while loop in the program. 2) The while loop in your java program must contain a closing statement for its termination. To have these smaller statements together, we combine these statements to form a big single statement by making a block of curly braces.This is a guide to While Loop in Java. We use different loops to iterate through the program so as to get the desired outcome. Loops in Java come into use when we need to repeatedly execute a block of statements.. Java while loop is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition. Here we discuss the syntax, work Flow along with an example of while loop in java. Otherwise, you will end up with an infinite loop which will waste a lot of memory. First of all, let's discuss its syntax: while (condition(s)) {// Body of loop} 1.

If this condition returns true then the code written under curly braces will be executed. It is advised to declare the variable outside the while loop since declaring a variable inside the loop may lead to an undesirable output.3) While loop can be called as a “universal loop” because any other loop (for, do-while) can be written in the form of while loop. This, in turn, will … We use cookies to ensure you have the best browsing experience on our website. If the condition(s) holds, then the body of the loop is executed after the execution of the loop body condition is tested again. If the expression evaluates to true, the while statement executes the statement(s) in the while block.