What is the difference between list.forEach () and list.stream (). ForEach () in java

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First of all, their function is to traverse each element of the array and execute the accept () method of the input parameter, but they are implemented in a different way, and in some specific cases, the execution will produce different results.

In most cases, both will produce the same results, but we will see some subtle differences.

Overview

First, create a list of iterations:

List list = Arrays.asList ("A", "B", "C", "D")

The most direct approach is to use an enhanced for loop:

For (String s: list ") {/ / something}

If we want to use functional Java, we can also use forEach (). We can do this directly on the collection:

Consumer consumer = s-> {System.out::println}; list.forEach (consumer)

Alternatively, we can call forEach () on the stream of the collection:

List.stream () forEach (consumer)

Both versions iterate through the list and print all elements:

ABCD ABCD

In this simple example, there is no difference in the forEach () we use.

Difference

List.forEach () uses enhanced for loops

Default void forEach (Consumer