For-each Loop

In Java, a for-each loop (also known as an enhanced for loop) is a variation of the for loop that allows a program to iterate over elements in an array or collection without using an explicit counter variable. The for-each loop is particularly useful for iterating over arrays and collections where the order of elements is important.

The basic syntax of a for-each loop in Java is as follows:

                
    for (element : collection) {
      // code to execute for each element
    }
                
            

In this example, the element variable represents the current element in the collection, and the collection is the array or collection being iterated over. The code inside the loop is executed once for each element in the collection.

Here's an example of how a for-each loop can be used in Java to iterate over an array

                
    int[] numbers = {1, 2, 3, 4, 5};

    for (int number : numbers) {
      System.out.println(number);
    }
                
            

In this example, the for-each loop iterates over each element in the numbers array and assigns the value of each element to the number variable. The code inside the loop then prints the value of number to the console.

For-each loops in Java can also be used to iterate over other types of collections, such as lists, maps, and sets. In addition, for-each loops can be nested to perform more complex iterations over multiple collections or data structures.

One thing to note is that for-each loops are not suitable for all situations. For example, if you need to modify the elements of the collection while iterating over it, a traditional for loop with an explicit counter variable would be a better choice.

Overall, for-each loops provide a simple and concise way to iterate over collections in Java, making code more readable and less prone to errors.