![]() Java do while loop executes the statement first and then checks for the condition.Other than that it is similar to the while loop. The value of i became 5 that is why it broke out of the loop 3. ("The value of i became " + i + " that is why it broke out of the loop") If you are still confused about the working flow of the while loop, refer to the flowchart below.Īn example java program to illustrate the use of a while loop: package The body of the loop generally contains a variable which controls the boolean condition mentioned.Īs soon as the condition hits false, the loop terminates. ![]() Hence it is called an entry-controlled loop. The condition of the loop structure is checked at first and then the control proceeds into the loop structure only if the condition evaluates to true. As long as the condition given evaluates to true, the loop iterates. Then we would have to use an enhanced for loop or a while loop.Ī while loop iterates through a set of statements till its boolean condition returns false. 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. While loops are very important as we cannot know the extent of a loop everytime we define one. Java program to illustrate the use of enhanced for-loop: package The syntax for Java enhanced for loop is: You cannot change the values in the collection while using this loop which is easily done by other loops. However there are some limitations to this enhanced for loop.This loop object is immutable which means the values which are retrieved during the execution of the loop are read only. You also need not know the size of the collection. It can be used to iterate over the elements of a collection without knowing the index of each element. This is similar to a for loop except that it has some enhanced features. Observe the value of the loop’s control variable i as it increases from 0 to 10 and then stops because the value of i becomes 11 and the condition becomes false. The control flow can be explained with a flowchart diagram:Īn example Java program explaining the functioning of a for loop: package If a particular variable is declared within this part, then the scope of the variable remains limited within the loop. However this statement is executed only once. This is the value of the control variable when the control shifts into the loop. It contains a variable with some initial value that is defined by the programmer. The initializing statement marks the beginning of the loop structure. The basic syntax of java for loop goes like this:įor(initializing statement testing condition increment/decrement) These are the initialization statement, a testing condition, an increment or decrement part for incrementing/decrementing the control variable. Java for loop consists of 3 primary factors which define the loop itself. In Java there are three primary types of loops:. As soon as this condition is false, the loop stops. The condition is important because we do not want the loop to be running forever. Looping in Java is defined as performing some lines of code in an ordered fashion until a condition is false. Join DataFlair on Telegram!! Loops in Java Stay updated with latest technology trends Loops make it very easy to group all the code that’s needed to be repetitively processed and throw it under scope. The copy paste method would not work because you still would have to go to all these lines and fit a number. Now if there is a different program which requires you to print the first 800 natural numbers. Let us say that you have managed to copy paste the entire thing easily. That would take up a lot of effort which is particularly just copy pasting the same sentence 800 times. Now we all know that the code for writing output is (“Text”) But in order to print this 800 times we will need to write the same line 800 times in the code. Imagine a program which is required to output a particular value of a variable 800 times. In this java tutorial, we will learn about the loops in java. This concept of repetitive actions performed time and again is called a loop. Again the next day, you do the same things in the same order and go to sleep again. Consider your daily routine, you wake up, you brush, you wear clothes and then head off to work, come back, eat and then sleep off. In order to understand what loops are, we have to look at some real life cases of loops. Loops are a fundamental concept in programming. Free Java course with 5 real-time projects Start Now!!
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