![]() Java for loops are structured to follow this order of execution:Ģ) boolean condition – if true, continue to next step if false, exit loopĥ) repeat from step 2 (boolean condition) ![]() For example, when looping over an array of numbers you will need to loop over as many times as there are elements in the array. For Loopįor loops are best used when you know how many times you have to loop over something. Throughout this tutorial, we’ll be referring to these concepts as we introduce each loop. loop body – execute the main part of the loop that does the processing.step value (update value) – an update to the loop variable(s).boolean condition – this is a boolean expression that determines whether to continue looping for one more iteration.loop initialization – setting the initial value of variable(s) to be used in the loop.Loops ConceptsĪll loops in Java use the same building blocks that we’re going to define here. And sometimes the programmer won’t know in advance how many pieces of data the program will encounter so looping will be necessary.įor example, loops can be used to iterate over a list of returned database records, to sort a list of numbers, or to read a file line by line. It’s better and more efficient to use loops than having to explicitly write the code to process each action. The basic reason for using loops is when a repetitive action needs to be taken over and over. for(int i = 0 i < arrayVar.Loops are used in most programs for a variety of reasons. int i = 0 Īnd doing this, will make the code harder to read than for loop that contains initialization of index (i), validation of value of i and increments of i all inside the for header. To work for this disadvantage, you will add new integer index(i) and set value to zero (0) int i = 0 out side the for each and adding increment inside the loop. ![]() ![]() But the disadvantage of using this loop, you will loose track of the index (i) of the selected array. This code will surely avoid ArrayIndexOutOfBoundsException because for each loop will make sure that it will only loop for the exact amount/length of the array. any thing you want to do with the value of the array int arrayNumber = new int // or some constant value if there is. But is is easier to use for each loop for most of the time. You start with i = 0 cause 0 is the first part of the array and the condition while i > array cause it can’t exceed the array and i++ to access the next part of the array.īecause as I know, your i should always be less (<) than the length of the array to avoid ArrayIndexOutOfBoundsException.īut is there a specific reason why you have to use a for loop and is there any other way to read values from an array?Īctually, you can use any loop that you know depending on what you need. The Array: int array = ĭisplay Array with the typical for loop: for (int i = 0 i (e + System.lineSeparator())) ĭisplay Array using IntStream (Java8+): IntStream.range(0, array.length).mapToObj(index -> array).forEach(System.out::println) In a lot of cases, it's simply the best to use for speed, ease of use, and readability. The better question might be: Why wouldn't you want to use a FOR loop to iterate through an array? There are many ways to iterate through an Array or a collection and there is no law that states you have to use the FOR loop.
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