You could potentially write a helper method which returned an empty sequence if you passed in null: public static <T> Iterable<T> emptyIfNull(Iterable<T> iterable) { return iterable == null ? …

May 18, 2017 · In Java 8 there is another solution available by using java.util.Optional and the ifPresent -method. Optional.ofNullable(list1).ifPresent(l -> l.forEach(item -> {/* do stuff */}));

Mar 23, 2018 · foreach loop compiled into either iterator or index based loop behind scenes. Whenever it access to the iterator for the list NullPointerException is thrown for null referenced …

Apr 14, 2025 · Example: Using a for-each loop to print each element of an array in Java. Explanation: In this example, the for-each loop iterates over the array “arr" and prints each …

Jan 8, 2024 · In this tutorial, we’ll discuss the for -each loop in Java along with its syntax, working, and code examples. Finally, we’ll understand its benefits and drawbacks.

In Java, performing null checks in enhanced for loops is crucial to prevent NullPointerExceptions. While the enhanced for loop simplifies iteration, ensuring the collection is not null before …

Feb 17, 2023 · To loop through and print all the numbers in the array, we made use of a for-each loop: for(int number : even_numbers){...}. In the parenthesis for the loop, we created an …

Mar 31, 2010 · The reason why you get null values as output is that you do not store any values in the array. You can use the foreach loop to initialize the array, but then you must manually …

Java forEach () is a utility function to iterate over a Collection (list, set or map) or Stream. It performs the specified Consumer action on each item in the Collection.

Feb 15, 2019 · You can use for each loop in Java to iterate through array, Collections (Set, List) or Map. The enhanced loop works for each class that implements Iterable interface as well. The …