Example 1 – Iterate Java Array using While Loop In the following program, we initialize an array of integers, and traverse the array from start to end using while loop. Syntax. If the textExpression evaluates to true, the code inside the while loop is executed. Example – Java Infinite While Loop while working with Continue Statement. However this is not possible in while loop. Consider the example below: While loop in java with example There are several looping statements available in java. do-while loop is similar to while loop, however there is a difference between them: In while loop, condition is evaluated before the execution of loop’s body but in do-while loop condition is evaluated after the execution of loop’s body. Java do-while loop is an Exit control loop. close, link If the number of iteration is not fixed and you must have to execute the loop at least once, it is recommended to use do-while loop. executed at least once, even if the condition is false, because the code block Java while loop is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition. Note that this while loop will become an Infinite Loop if we do not increment the loop counter variable. The loop will always be If the number of iteration is not fixed, it is recommended to use while loop. But while using second loop you can set i again to 0. The syntax of the while loop is: while (testExpression) { // body of loop } Here, A while loop evaluates the textExpression inside the parenthesis (). Dry-Running Example 1: The program will execute in the following manner. Java Program to Check Array Bounds while Inputing Elements into the Array. Here we are iterating and displaying array elements using while loop. repeat the loop as long as the condition is true. This loop will While loop in Java. Loops in Java come into use when we need to repeatedly execute a block of statements. The statements inside the body of the loop get executed. Java while loop example Following program asks a user to input an integer and prints it until the user enter 0 (zero). As soon as, the counter reaches 6, the loop terminates. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. The do/while loop is a variant of the while loop. Example: Iterating an array using while loop. Print all numbers from 1 to N. To print all integers between 1 and 5 using a while-loop, we can create a condition on a local variable counter which must not be less than or equal to 5. When the main program is executed and the program encounters a while loop in the program. Loops in Java come into use when we need to repeatedly execute a block of statements. Flow chart while loop (for Control Flow): Example 1: This program will try to print “Hello World” 5 times. In Java, a number is not converted to a boolean constant. The example below uses a do/while loop. A while loop statement in Java programming language repeatedly executes a target statement as long as a given condition is true. In this quick article, we will discuss how to use a do-while loop with examples. This loop is executed until the condition returns false. One of them is while loop in java. We start with an index of zero, condition that index is less than the length of array, and increment index inside while loop. Simple java while loop example Below is a simple code that demonstrates a java while loop. Syntax: while( condition ) { //statements //loop counters } Example 1: A simple while loop. A while statement looks like below. the loop will never end! How to fix java.lang.ClassCastException while using the TreeMap in Java? In Java, a while loop consists of the keyword while followed by a Boolean expression within parentheses, followed by the body of the loop, which can be a single statement or a block of statements surrounded by curly braces. While loop evaluates the boolean expression, and if it is true, it executes the block of statements. Don’t stop learning now. Nested while loop By using our site, you While loop executes the code inside the bracket if the condition statement returns to true, but in the Do-While loop, the code inside the do statement will always be called. If Condition yields true, the flow goes into the Body. // infinite do...while loop const count = 1; do { // body of loop } while(count == 1) In the above programs, the condition is always true. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Beginning Java programming with Hello World Example, Decision Making in Java (if, if-else, switch, break, continue, jump), StringBuilder Class in Java with Examples. Example. Once this condition returns false then while loop i… An example of java while loop is public class loopsss { public static void while (condition) { //code to be executed } Example: The Java while loop is used to iterate a part of the program several times. Remove an Entry using key from HashMap while Iterating over it, Remove an Entry using value from HashMap while Iterating over it, Hello World Program : First program while learning Programming, Flatten a Stream of Lists in Java using forEach loop, Flatten a Stream of Arrays in Java using forEach loop, Flatten a Stream of Map in Java using forEach loop, Data Structures and Algorithms – Self Paced Course, Ad-Free Experience – GeeksforGeeks Premium, We use cookies to ensure you have the best browsing experience on our website. The do-while loop has ended and the flow has gone outside. The condition may be any expression, and true is any non zero value Syntax: while(condition) {. } int counter = 1; while (counter <= 5) {. So after 1st loop i=n1-1 at the end. While using W3Schools, you agree to have read and accepted our. int i = 0; while (i < 5) { System.out.println(i); i++; } Try it Yourself ». The while loop can be thought of as a repeating if statement. We will see now below with example programs. Parameter Passing Techniques in Java with Examples, Different ways of Method Overloading in Java, Constructor Chaining In Java with Examples, Private Constructors and Singleton Classes in Java, Difference between Abstract Class and Interface in Java, Comparator Interface in Java with Examples, Collection vs Collections in Java with Example, Java | Implementing Iterator and Iterable Interface, SortedSet Interface in Java with Examples, SortedMap Interface in Java with Examples, File Handling in Java with CRUD operations, Split() String method in Java with examples, Write Interview The Java do-while loop is executed at least once because condition is checked after loop body. View An example of java while loop is displaying numbers from 1 to 10.docx from CS 1102 at University of the People. 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. A "While" Loop is used to repeat a specific block of code an unknown number of times, until a condition is met. Hence, the loop body will run for infinite times. Braces are options if there is only one statement to be executed. Infinite while loop 4. Below is the workflow diagram of the while loop. Example 2: This program will find the summation of numbers from 1 to 10. If Condition yields false, the flow goes outside the loop. 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. In the last tutorial, we discussed while loop.In this tutorial we will discuss do-while loop in java. How to Maintain Insertion Order While Getting Unique Values from ArrayList in Java? Please use ide.geeksforgeeks.org, The while loop can be thought of as a repeating if statement. While loop is used to execute some statements repeatedly until condition returns false. edit the loop will never end! 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. Using for loop you can work with a single variable, as it sets the scope of variable for a current working for loop only. The condition corresponding to while loop is checkedwhich is written in brackets. Table of contents. Syntax: do { // loop body update_expression } while (test_expression); "until both operands are 0", so you can just loop out on the condition "x+y != 0", for example, x=5,y=-5,you can't just loop out. Syntax: while (test_expression) { // statements update_expression; } Note: Do not forget to increase the variable used in the condition, otherwise the loop will never end! Java while loop. while loop for Java: This condition will be given and the body of the loop will be executed until the given condition is false class WhileLoopExample3 { public static void main(String args[]) { int arr[]= {2,11,45,9}; //i starts with 0 as array index starts with 0 too int i=0; while(i<4) { System.out.println(arr[i]); i++; } } } execute the code block once, before checking if the condition is true, then it will For example, if we want to ask a user for a number between 1 and 10, we don't know how many times the user may enter a larger number, so we keep asking "while the number is not between 1 and 10". Simple while Loop Example; The while Loop with No Body; Infinite while Loop The Java while loop is to iterate a code block for a given number of times till the condition inside a loop is False. The condition given in the while loop will execute the code inside the while loop for 10 times. If the condition is false, the Java while loop … However The Java Do-While Loop The Java Do-While loop is almost the same in While Loop. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. Writing code in comment? While loop syntax 2. "repeat" means you should assign new int value to the x and y variable in the while loop. The "While" Loop . Loops can execute a block of code as long as a specified condition is reached. This also is a typical scenario where we use a continue statement in the while loop body, but forget to modify the control variable. generate link and share the link here. While flowchart 3. a variable (i) is less than 5: Note: Do not forget to increase the variable used in the condition, otherwise Simple Java While Loop Examples A simple while loop example given below contains the while loop with the condition. You can implement an infinite loop using the while statement as follows: while (true) { // your code goes here } The Java programming language also provides a do-while statement, which can be expressed as follows: do { statement (s) } while (expression); Loops are handy because they save time, reduce errors, and they make code more readable. Java do-while Loop. Examples might be simplified to improve reading and learning. The loop in this example uses a for loop to collect the car names from the cars array: Experience. For example if we are asked to take a dynamic collection and asked to iterate through every element, for loops would be impossible to use because we do not know the size of the collection. For example, // infinite while loop while(true) { // body of loop } Here is an example of an infinite do...while loop. The syntax of a while loop is − while(Boolean_expression) { // Statements } Here, statement(s) may be a single statement or a block of statements. The Java do-while loop is used to iterate a part of the program several times. If the Boolean expression is true, the control jumps back up to do statement, and the statements in the loop execute again. brightness_4 Comparing For and While. Boolean condition is any valid Java expression that evaluates to boolean value. Syntax: while loop example. The while loop loops through a block of code as long as a specified condition is true: In the example below, the code in the loop will run, over and over again, as long as I am using the while loop here to print the numbers from 0 to 9. While loop syntax. It repeats a statement or block while its controlling expression is true. In the following example, we have initialized i to 10, and in the while loop we are decrementing i by one during each A while loop in Java does not work with integers. while(){;} Block of statements is any valid Java code. Java while loop is used to run a specific code until a certain condition is met. The do-while loop is similar to while loop, however, there is a difference between them: In a while loop, a condition is evaluated before the execution of loop’s body but in a do-while loop, a condition is evaluated after the execution of loop’s body. How while Loop Works? For Example: int i; for(i=0; in1;i++) do something.. for(i=0;i n2;i+=2) do something. Java while loop is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition. public class simpleWhileLoopDemo { public static void main(String[] args) { int i=1; while(i<=5) { System.out.println("Value of i is: " + i); i++; } } } In this chapter, we will learn how to use while loop with examples. is executed before the condition is tested: Do not forget to increase the variable used in the condition, otherwise If the condition is met to return true then the control enters the loop body. Attention reader! Java While loop start by verifying the condition, if it is true, the code within the while loop will run. Loops in Java come into use when we need to repeatedly execute a block of statements. Java While loop is an iterative loop and used to execute set of statements for a specified number of times. 1. Another example of While Loop in Java: // Java While Loop example package Loops; import java.util.Scanner; public class WhileLoop { private static Scanner sc; public static void main(String[] args) { int number, sum = 0; sc = new Scanner(System.in); System.out.println("n Please Enter any integer Value below 10: "); number = sc.nextInt(); while (number <= 10) { sum = sum + number; number++; } System.out.format(" Sum of the Numbers From the While Loop … While loops are very important as we cannot know the extent of a loop everytime we define one. code. 2. Difference between while and do-while loop in C, C++, Java, Difference between for and do-while loop in C, C++, Java, Difference between for and while loop in C, C++, Java, Java Program to Reverse a Number and find the Sum of its Digits Using do-while Loop, Java Program to Find Sum of Natural Numbers Using While Loop, Java Program to Compute the Sum of Numbers in a List Using While-Loop, Difference Between for loop and Enhanced for loop in Java. here's the code, may help you How to convert an Array to String in Java? Therefore, unlike for or while loop, a do-while check for the condition after executing the statements or the loop body. The while loop is Java’s most fundamental loop statement. We discussed while loop.In this tutorial we will discuss do-while loop is used to run a specific until... Use a do-while check for the condition given in the while loop Java come use... Control jumps back up to do statement, and examples are constantly reviewed to errors... 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