How to Use forEach with Map Entry Set in Java 8

How can I convert a traditional for-each loop for a Map entry set to Java 8's forEach method?

for (Map.Entry<String, String> entry : map.entrySet()) {
    System.out.println("Key : " + entry.getKey() + " Value : " + entry.getValue());
}

In Java 8, you can simplify your code by using the `forEach` method combined with lambda expressions, which can lead to more concise and readable code. However, it is important to use the correct syntax to avoid errors related to lambda expression signatures.

map.forEach((key, value) -> {
    System.out.println("Key : " + key + " Value : " + value);
});

Causes

• You are attempting to use a lambda expression incorrectly by specifying types in a way that conflicts with the functional interface expected by the `forEach` method.
• The `forEach` method on a Map uses an `BiConsumer`, which expects two parameters: key and value.

Solutions

• Use the existing `forEach` method provided by `Map`, which directly takes a `BiConsumer` as a parameter: `map.forEach((key, value) -> { ... });`
• Here's the correct way to implement a lambda expression for the Map entry set:

Mistake: Specifying types in the lambda expression, as in 'Map.Entry<String, String> entry -> {...}'.

Solution: When using lambda expressions, avoid specifying types as this results in a signature mismatch.

Mistake: Using a forEach loop on the entry set directly instead of applying it on the map itself.

Solution: Remember that `forEach` should be invoked on the map and not on its entry set.