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. Loops can execute a block of code as long as a specified condition is reached. In the following example, we have initialized i to 10, and in the while loop we are decrementing i by one during each The Java do-while loop is executed at least once because condition is checked after loop body. 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. Nested while loop Examples might be simplified to improve reading and learning. 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. Java do-while loop is an Exit control loop. View An example of java while loop is displaying numbers from 1 to 10.docx from CS 1102 at University of the People. Java while loop. One of them is while loop in java. int counter = 1; while (counter <= 5) {. The condition corresponding to while loop is checkedwhich is written in brackets. 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. While loop in java with example There are several looping statements available in java. Simple while Loop Example; The while Loop with No Body; Infinite while Loop Don’t stop learning now. As soon as, the counter reaches 6, the loop terminates. Syntax: while(condition) {. } Java while loop is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition. An example of java while loop is public class loopsss { public static void Consider the example below: "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. Loops in Java come into use when we need to repeatedly execute a block of statements. brightness_4 When the main program is executed and the program encounters a while loop in the program. Note that this while loop will become an Infinite Loop if we do not increment the loop counter variable. Syntax: while( condition ) { //statements //loop counters } Example 1: A simple 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. Example. The do-while loop has ended and the flow has gone outside. 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. Note: Do not forget to increase the variable used in the condition, otherwise the loop will never end! The do/while loop is a variant of the while loop. For Example: int i; for(i=0; in1;i++) do something.. for(i=0;i n2;i+=2) do something. Loops in Java come into use when we need to repeatedly execute a block of statements. code. Java while loop is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition. Syntax: while (test_expression) { // statements update_expression; } Example: Iterating an array using while loop. the loop will never end! Example 2: This program will find the summation of numbers from 1 to 10. Writing code in comment? Example – Java Infinite While Loop while working with Continue Statement. repeat the loop as long as the condition is true. The condition may be any expression, and true is any non zero value 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++; } } } 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. Loops are handy because they save time, reduce errors, and they make code more readable. If the condition is false, the Java while loop … The loop will always be If the number of iteration is not fixed, it is recommended to use while loop. Using for loop you can work with a single variable, as it sets the scope of variable for a current working for loop only. execute the code block once, before checking if the condition is true, then it will The statements inside the body of the loop get executed. Braces are options if there is only one statement to be executed. I am using the while loop here to print the numbers from 0 to 9. The while loop can be thought of as a repeating if statement. close, link Experience. Java While loop start by verifying the condition, if it is true, the code within the while loop will run. 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. 1. While flowchart 3. Java While loop is an iterative loop and used to execute set of statements for a specified number of times. If the textExpression evaluates to true, the code inside the while loop is executed. How to Maintain Insertion Order While Getting Unique Values from ArrayList in Java? Java while loop example Following program asks a user to input an integer and prints it until the user enter 0 (zero). So after 1st loop i=n1-1 at the end. If Condition yields false, the flow goes outside the loop. While loop is used to execute some statements repeatedly until condition returns false. Flow chart while loop (for Control Flow): Example 1: This program will try to print “Hello World” 5 times. 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. 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. while(){;} Block of statements is any valid Java code. 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. The example below uses a do/while loop. We will see now below with example programs. Below is the workflow diagram of the while loop. public class simpleWhileLoopDemo { public static void main(String[] args) { int i=1; while(i<=5) { System.out.println("Value of i is: " + i); i++; } } } If the condition is met to return true then the control enters the loop body. Simple Java While Loop Examples A simple while loop example given below contains the while loop with the condition. Hence, the loop body will run for infinite times. Table of contents. Comparing For and While. while (condition) { //code to be executed } Example: Dry-Running Example 1: The program will execute in the following manner. The while loop can be thought of as a repeating if statement. Syntax: do { // loop body update_expression } while (test_expression); This loop is executed until the condition returns false. While loop in Java. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. Infinite while loop 4. The Java while loop is used to iterate a part of the program several times. Syntax: while loop for Java: This condition will be given and the body of the loop will be executed until the given condition is false The while loop is Java’s most fundamental loop statement. This loop will Please use ide.geeksforgeeks.org, In this chapter, we will learn how to use while loop with examples. // infinite do...while loop const count = 1; do { // body of loop } while(count == 1) In the above programs, the condition is always true. While loops are very important as we cannot know the extent of a loop everytime we define one. a variable (i) is less than 5: Note: Do not forget to increase the variable used in the condition, otherwise 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. 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