![]() ![]() Here, the test expression, i <= 10, is never false and Hello is printed repeatedly until the memory runs out. If we set the test expression in such a way that it never evaluates to false, the for loop will run forever. In the first iteration of the loop, number will be 3, number will be 7 in second iteration and so on. Here, we have used the for-each loop to print each element of the numbers array one by one. The Java for loop has an alternative syntax that makes it easy to iterate through arrays and collections. for-each loop enhances the code readability and is less prone to errors.The output of this program is the same as the Example 3.We can use the break keyword in Java to terminate(stop) the for-each loop for some condition.for-each loop can not be used to modify the iterable or collection. ![]() for-each loop can not be executed in reverse order.for-each loop does not require the index of iterable elements.To specify that the number shouldn’t go above 5, the termination condition. This looks like this: int i 1 is the initialization. After that the for-loop should be stopped. In our example, the program is to count until we reach 5. for-each loop can be used to iterate over iterables such as arrays, hashmaps and lists in Java. The easiest way to explain how a for-loop works in Java is to use the appropriate source code.for-each loop is an alternative approach for traversing an iterable. ![]() for-each loop is also called 'enhanced for loop'.The for loop is index based hence the iterable elements are accessed using their indices.įor-each loop is element based hence the iterable elements are accessed directly using the assigned variable.įor loop can perform forward as well as backward iteration.įor-each loop can only perform forward iteration.ĭata manipulation of the iterable is possible by using for loop.ĭata manipulation of the iterable is not possible by using for-each loop as only the values of the iterable elements are passed, not the reference of iterable elements. When we need to access the indices of the elements in the iterable, we cannot use for-each loop.ĭifference Between For Loop and for-each Loop in Java.Also note that for-each loop can not be executed in a reverse order, unlike for loop which is able to execute the code in the reverse order as well.Whenever we just want to loop or iterate over a specific portion of the iterable instead of the whole iterable or we want to modify the iterable, we use a for loop instead of the for-each loop.It is also important to know when we can not use a for-each loop? It enhances the readability of code : As the syntax of the for-each loop is very simple and short, the code in the for-each loop's body becomes more readable.ĭecreases the chances of errors : The chances of getting errors also get reduced while using the for-each loop as it is generally less prone to errors. More convenient : When we want to iterate through the whole iterable, for-each loop is an easier and simpler way of doing this as we do not have to provide the index of the elements. As we added three elements( Pen, Pencil and Paper) in the list, when we used for-each loop for traversing through the list, all the three elements were printed in the output.Then when you reach the next fourth element you have the value from the previous one in your temporary variable, which sounds similar to what you are looking for from your response to patrick dw's answer below. In the above given example, the for-each loop is used for traversing a list called 'myList'. Here the more broadly scoped previousTop is then being set every fourth item before you do whatever else you need to do.The for-each loop makes the code simple as it reduces the code length due to its short and easy syntax. The main purpose of for-each loop is to traverse the iterable without using the index of iterable elements unlike for loops. It is one of the alternative approaches that is used for traversing arrays.Īfter accessing the iterable elements, we can perform various operations on them. ![]() The for-each loop in Java, also called as 'enhanced for loop', was introduced in Java 5. are iterables in Java, which means they can be iterated using loops in Java. In Java, there is an interface called as Iterable interface that represents a collection of objects which can be iterated. It changes to successive elements in the Collection after each iteration. The variable can be used to access the collection elements without any indexing. In for-each loop traversal technique, you can directly initialize a variable with the same type as the base type of the array. The for-each loop was introduced in Java 5 which is used specifically for traversing a collection in Java. ![]()
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