while loop java multiple conditions

First, We'll start by looking at how to apply the single filter condition to java streams. SyntaxError: Unexpected '#' used outside of class body, SyntaxError: unparenthesized unary expression can't appear on the left-hand side of '**', SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. It repeats the above steps until i=5. This type of while loop is called an indefinite loop, because it's a loop where you don't know when the condition will be true. This means that a do-while loop is always executed at least once. The second condition is not even evaluated. To unlock this lesson you must be a Study.com Member. Use a while loop to print the value of both numbers as long as the large number is larger than the small number. I would definitely recommend Study.com to my colleagues. If the condition (s) holds, then the body of the loop is executed after the execution of the loop body condition is tested again. In this tutorial, we learn to use it with examples. Why does Mister Mxyzptlk need to have a weakness in the comics? Iteration 1 when i=0: condition:true, sum=20, i=1, Iteration 2 when i=1: condition:true, sum=30, i=2, Iteration 3 when i=2: condition:true, sum =70, i=3, Iteration 4 when i=3: condition:true, sum=120, i=4, Iteration 5 when i=4: condition:true, sum=150, i=5, Iteration 6 when i=5: condition:false -> exits while loop. It would also be good if you had some experience with conditional expressions. copyright 2003-2023 Study.com. The following examples show how to use the while loop to perform one or more operations as long a the condition is true. How do I generate random integers within a specific range in Java? The while loop is considered as a repeating if statement. is printed to the console. Lets walk through an example to show how the while loop can be used in Java. He has experience in range of programming languages and extensive expertise in Python, HTML, CSS, and JavaScript. How can I use it? Study the syntax and examples of the while loop, the indefinite while loop, and the infinite loop. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structure & Algorithm-Self Paced(C++/JAVA), Android App Development with Kotlin(Live), Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Similarities and Difference between Java and C++, Decision Making in Java (if, if-else, switch, break, continue, jump), StringBuilder Class in Java with Examples, Object Oriented Programming (OOPs) Concept in Java, Constructor Chaining In Java with Examples, Private Constructors and Singleton Classes in Java, Comparison of Inheritance in C++ and Java, Dynamic Method Dispatch or Runtime Polymorphism in Java, Different ways of Method Overloading in Java, Difference Between Method Overloading and Method Overriding in Java, Difference between Abstract Class and Interface in Java, Comparator Interface in Java with Examples, Flow control in try catch finally in Java, SortedSet Interface in Java with Examples, SortedMap Interface in Java with Examples, Importance of Thread Synchronization in Java, Thread Safety and how to achieve it in Java. First of all, let's discuss its syntax: while (condition (s)) { // Body of loop } 1. We first initialize a variable num to equal 0. When condition After the increment operator has executed, our program calculates the remaining capacity of tables by subtracting orders_made from limit. A while loop is like a loop on a roller coaster, except that it won't stop going around until the operator flips a switch. class BreakWhileLoop { public static void main(String[] args) { int n; Scanner input = new Scanner(System.in); while (true) { // Condition in while loop is always true here System.out.println("Input an integer"); n = input.nextInt(); if (n == 0) { break; } System.out.println("You entered " + n); } }}, class BreakContinueWhileLoop { public static void main(String[] args) { int n; Scanner input = new Scanner(System.in); while (true) { System.out.println("Input an integer"); n = input.nextInt(); if (n != 0) { System.out.println("You entered " + n); continue; } else { break; } } }}. Best suited when the number of iterations of the loop is not fixed. If your code, if the user enters 'X' (for instance), when you reach the while condition evaluation it will determine that 'X' is differente from 'n' (nChar != 'n') which will make your loop condition true and execute the code inside of your loop. The program will thus print the text line Hello, World! But for that purpose, it is usually easier to use the for loop that we will see in the next article. No "do" is required in this case. Similar to for loop, we can also use a java while loop to fetch array elements. Then we define a class called GuessingGame in which our code exists. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning and training. Don't overpay for pet insurance. In this example, we will use the random class to generate a random number. An optional statement that is executed as long as the condition evaluates to true. To put it simply, were going to read text typed by the player. As you can imagine, the same process will be repeated several more times. In fact, a while loop body is repeated as long as the loop condition stays true you can think of them as if statements where the body of the statement can be repeated. I will cover both while loop versions in this text.. when we do not use the condition in while loop properly. How can I use it? Now, it continues the execution of the inner while loop completely until the condition j>=5 returns false. That was just a couple of common mistakes, there are of course more mistakes you can make. Once the input is valid, I will use it. Software developer, hardware hacker, interested in machine learning, long distance runner. Visit Mozilla Corporations not-for-profit parent, the Mozilla Foundation.Portions of this content are 19982023 by individual mozilla.org contributors. to true. What are the differences between a HashMap and a Hashtable in Java? I want to exit the while loop when the user enters 'N' or 'n'. What is \newluafunction? In the while condition, we have the expression as i<=5, which means until i value is less than or equal to 5, it executes the loop. Thewhile loop evaluatesexpression, which must return a booleanvalue. If the number of iterations not is fixed, its recommended to use a while loop. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? I highly recommend you use this site! When there are no tables in-stock, we want our while loop to stop. If the number of iterations not is fixed, it's recommended to use a while loop. Sometimes these infinite loops will crash, especially if the result overflows an integer, float, or double data type. So, its important to make sure that, at some point, your while loop stops running. It then again checks if i<=5. However, the loop only works when the user inputs a non-integer value. repeat the loop as long as the condition is true. Based on the result of the evaluation, the loop either terminates or a new iteration is started. This example prints out numbers from 0 to 9. test_expression This is the condition or expression based on which the while loop executes. If you have a while loop whose statement never evaluates to false, the loop will keep going and could crash your program. Instead of having to rewrite your code several times, we can instead repeat a code block several times. Linear regulator thermal information missing in datasheet. Heres the syntax for a Java while loop: The while loop will test the expression inside the parenthesis. We can also have an infinite java while loop in another way as you can see in the below example. Also each call for nextInt actually requires next int in the input. For example, if you want to continue executing code until the user hits a specific key or a specified threshold is reached, you would use a while loop. Add Answer . This means that when fewer than five orders have been made, a message will be printed saying, There are [tables_left] tables in stock. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Psychological Research & Experimental Design, All Teacher Certification Test Prep Courses, Financial Accounting for Teachers: Professional Development, Public Speaking for Teachers: Professional Development, Workplace Communication for Teachers: Professional Development, Business Ethics: Skills Development & Training, Business Math: Skills Development & Training, Quantitative Analysis: Skills Development & Training, Organizational Behavior: Skills Development & Training, MTTC Marketing Education (036): Practice & Study Guide, WEST Business & Marketing Education (038): Practice & Study Guide, While Loop: Definition, Example & Results, While Loops in Python: Definition & Examples, Unique Selling Proposition (USP): Examples & Definition, What Is Product Placement? This means the code will run forever until it's killed or until the computer crashes. This article will look at the while loop in Java which is a conditional loop that repeats a code sequence until a certain condition is met. A do-while loop first executes the loop body and then evaluates the loop condition. Since the while statement runs only while a certain condition or conditions are true, there's the very real possibility that you end up creating an infinite loop. How do/should administrators estimate the cost of producing an online introductory mathematics class? All rights reserved. So, better use it only once like this: I am not completly sure about this, but an issue might be calling scnr.nextInt() several times (hence you might give the value to a field to avoid this). We want our user to first be asked to enter a number before checking whether they have guessed the right number. The syntax for the while loop is similar to that of a traditional if statement. In other words, you repeat parts of your program several times, thus enabling general and dynamic applications because code is reused any number of times. An expression evaluated before each pass through the loop. "while" works fine by itself. The Java do while loop is a control flow statement that executes a part of the programs at least . 1. Again control points to the while statement and repeats the above steps. succeed. ?` unparenthesized within `||` and `&&` expressions, SyntaxError: for-in loop head declarations may not have initializers, SyntaxError: function statement requires a name, SyntaxError: identifier starts immediately after numeric literal, SyntaxError: invalid assignment left-hand side, SyntaxError: invalid regular expression flag "x", SyntaxError: missing ) after argument list, SyntaxError: missing ] after element list, SyntaxError: missing } after function body, SyntaxError: missing } after property list, SyntaxError: missing = in const declaration, SyntaxError: missing name after .