The while loop can be thought of as a repeating if statement. “i” is compared as precondition written (which is “i” should be less than or equal to 10). We use different loops to iterate through the program so as to get the desired outcome.

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. However, the reverse is not true.4) While it is an entry controlled loop. 2) The while loop in your java program must contain a closing statement for its termination. 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. Otherwise, you will end up with an infinite loop which will waste a lot of memory.

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. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Web development, programming languages, Software testing & othersWeb development, programming languages, Software testing & others40 Online Courses | 29 Hands-on Projects | 285+ Hours | Verifiable Certificate of Completion | Lifetime Access | 4 Quizzes with Solutions The while statement evaluates expression, which must return a boolean value. If the condition is met, then only the code inside the while loop will be executed, otherwise while loop will be terminated, and statement after 5) We can also write empty while loop. If the condition(s) holds, then the body of the loop is executed after the execution of the loop body condition is tested again. So as to terminate the while loop the condition needs to be updated every time the loop is executed. First of all, let's discuss its syntax: while (condition(s)) {// Body of loop} 1.

You will have to close the output window and restart the program execution. When “i” becomes 11 the condition return false and loop will be terminated printing numbers starting from one to ten in output screen. 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 … For example:Considering x is initialized with 1. 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.

By using our site, you It is advisable not to have empty while loops since it delays the execution time of the program. All the loops provide similar functionality. Here we discuss the syntax, work Flow along with an example of while loop in java. If the Boolean expression is true, the control jumps back up to do statement, and the statements in the loop … The difference between these loops is of Syntax and the condition checking time. Attention reader!

If there is no requirement as such to have a fixed number of iterations then we use while loop instead of other loops. Here variable “i” is initialized with 1.

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. The loop in this example uses a for loop to collect the car names from the cars array: We use cookies to ensure you have the best browsing experience on our website. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.

Here, statement(s) may be a single statement or a block of statements. 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. Once the condition returns false in a while loop, the control will come out of the loop.

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When the main program is executed and the program encounters a while loop in the program. In Java, a while loop is used to execute statement(s) until a condition is true.