For Each loop Puzzle in Java

From Java 5 onwards, we have a for-each loop for iterating over collection and array in Java. For each loop allows you to traverse over collection without keeping track of index like traditional for loop, or calling hasNext() method in while loop using Iterator or ListIterator. For-each loop indeed simplified iteration over any Collection or array in Java, but not every Java programmer is aware of some useful details of for-each loop, which we will see in this tutorial. Unlike other popular items from Java 5 release alias Generics, Autoboxing and variable arguments, Java developers tend to use for-each loop more often than any other feature, but when asked about how does advanced foreach loop works or what is basic requirement of using a Collection in for-each loop, not everyone can answer. This small tutorial and example aims to bridge that gap by going through some interesting foreach loop puzzles. So, without any further delay let's see our first puzzle on Java 5 for-each loop.

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