Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind Java HashMap forEach() Method?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Order
Put the learning moves in the order that makes the concept easiest to apply.
The forEach() method performs an action on every entry in the map.
Definition and Usage
Java HashMap forEach() Method
❮ HashMap Methods
forEach()Definition and Usage
The forEach() method performs an action on every entry in the map. The action can be defined by a lambda expression that is compatible with the accept() method of Java's BiConsumer interface.
To learn about lambda expressions, see our Java Lambda Expression tutorial .
Syntax
public void forEach(BiConsumer
action )Parameter Values
| Parameter | Description |
|---|---|
| action | Required. A BiConsumer object or lambda expression which performs an action on an entry. The first parameter contains the key of an entry and the second parameter contains its value. |