The Boolean expression is now evaluated again. A loop statement allows us to execute a statement or group of statements multiple times and following is the general form of a loop statement in most of the programming languages − Java programming language provides the following types of loop to handle looping requirements. Iterator loop. String[] strArray3 = {“R”,”S”,”T”}; //iterating all elements in the array for (int i = 0; i < strArray3.length; i++) { System.out.print(strArray3[i]); } The code starts from index 0, and continues up to length – 1, which is the last element of the array. For more practice with string processing, see the Free Response Question in the Practice and Summary section of this unit. This will just replace the first sentence in the example below but you can add other sentences to test. substring ( i , i + 1 ); // Process the string … For loops with strings usually start at 0 and use the string’s length() for the ending condition to step through the string character by character. Total Questions: 45. for (int i = 0; i < 3; i++) { for (int y = 0; y < 3; y++) { System.out.println (i + "," + y); } } } } 0,0 0,1 0,2 1,0 1,1 1,2 2,0 2,1 2,2. Java for Loop The initialExpression initializes and/or declares variables and executes only once. In the comment section below, Govardhan asked a question: He asked, how to iterate an ArrayList using Enumeration.Govardhan here is the code: In Java 8, with the introduction of Functional Interface & Lambda’s, Java architects have provided us with an Internal Iterator (forEach loop) supported by Collection framework and can be used with the collections object. What would happen if you started the loop at 1 instead? In java, objects of String are immutable which means a constant and cannot be changed once created. Components of For loop. Statement 3 increases a value (i++) each time the … You can use for each loop in Java to iterate through array, Collections(Set, List) or … Super-common string for-loop Loop to hit each index number once: 0, 1, 2, ... length-1 for (int i = 0; i < str.length(); i++) {for (int i = 0; i . We can use a simple for loop to process each character of the String in reverse direction. You can watch it in action in this Java visualizer. Java program that uses nested for-loops. An example of such usage is the regular-expression package java.util.regex. Therefore, unlike for or while loop, a do-while check for the condition after executing the statements or the loop body. If the condition is true, the body of the for loop is executed. : The Java while loop is a control flow statement that executes a part of the programs repeatedly on the basis of given boolean condition. The Java provides simple as well as “enhanced” for statement that is used with arrays and other collections. Watch Now. Here is a simple Java for loop example: . Normally, a Java loop exits when the specified condition evaluates to false. The updateExpression updates the value of initialExpression. Java 5 introduced an for-each loop, which is called a enhanced for each loop.It is used to iterate over elements of an array and the collection.. for-each loop is a shortcut version of for-loop which skips the need to get the iterator and loop over iterator using it’s hasNext() and next() method.. 1. For loops are used when you know you want to visit every character. It’s more readable and reduces a chance to get a bug in your loop. It is mainly used to traverse the array or collection elements. Break and Continue are also tested. In Java 8, the new forEach statement is provided that can be used to loop the maps or list etc. The condition is evaluated again. for/of lets you loop over data structures that are iterable such as Arrays, Strings, Maps, NodeLists, and more. package com.mkyong.core; import java.util.Arrays; import java.util.Iterator; import java.util.List; public class ArrayToList { public static void main(String [] argv) { String sArray [] = new String [] { "Array 1", "Array 2", "Array 3" }; // convert array to list List lList = Arrays.asList (sArray); // iterator loop System.out.println ( "#1 iterator" ); Iterator