What is the role of the Lambda function when using the For Each method?

The Lambda function when using the forEach method in Java serves to define the action that needs to be performed for each element of the collection.

The forEach method takes a functional interface Consumer<T> as a parameter, which is implemented using a lambda expression. This allows for a concise and convenient way to describe the operation applied to each element.

Example:

List<String> names = Arrays.asList("Anna", "Bob", "Charlie");
names.forEach(name -> System.out.println(name));

Here, the lambda name -> System.out.println(name) is a function that outputs each list element to the console.

Thus, the role of the lambda function is to define the behavior that will be executed for each element during the collection traversal using the forEach method.