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The ArrayDeque
class in Java provides the forEach(Consumer<? super E> action)
method to perform the given action for each element in the deque.
Table of Contents
- Introduction
forEach
Method Syntax- Examples
- Using
forEach
to Print Elements - Using
forEach
to Perform Custom Actions
- Using
- Real-World Use Case
- Use Case: Task Management System
- Conclusion
Introduction
The ArrayDeque.forEach(Consumer<? super E> action)
method is used to iterate over each element in the ArrayDeque
and perform the specified action. This method is useful for processing all elements in the deque without modifying it.
forEach Method Syntax
The syntax for the forEach
method is as follows:
public void forEach(Consumer<? super E> action)
- The method takes a single parameter
action
of typeConsumer<? super E>
, which defines the action to be performed on each element. - The method does not return any value.
Examples
Using forEach
to Print Elements
The forEach
method can be used to print all elements in an ArrayDeque
.
Example
import java.util.ArrayDeque; public class ArrayDequeForEachExample { public static void main(String[] args) { // Creating an ArrayDeque of Strings ArrayDeque<String> tasks = new ArrayDeque<>(); // Adding elements to the ArrayDeque tasks.add("Complete project report"); tasks.add("Email client updates"); tasks.add("Prepare presentation"); // Using forEach to print all elements tasks.forEach(task -> System.out.println("Task: " + task)); } }
Output:
Task: Complete project report Task: Email client updates Task: Prepare presentation
Using forEach
to Perform Custom Actions
The forEach
method can also be used to perform custom actions on each element in the ArrayDeque
.
Example
import java.util.ArrayDeque; public class CustomActionForEachExample { public static void main(String[] args) { // Creating an ArrayDeque of Strings ArrayDeque<String> tasks = new ArrayDeque<>(); // Adding elements to the ArrayDeque tasks.add("Complete project report"); tasks.add("Email client updates"); tasks.add("Prepare presentation"); // Using forEach to perform custom actions on all elements tasks.forEach(task -> { // Custom action: print task in uppercase System.out.println("Task: " + task.toUpperCase()); }); } }
Output:
Task: COMPLETE PROJECT REPORT Task: EMAIL CLIENT UPDATES Task: PREPARE PRESENTATION
Real-World Use Case
Use Case: Task Management System
In a task management system, you might need to iterate over all tasks in the deque to perform actions such as logging, updating statuses, or sending notifications. The forEach
method can help achieve this functionality.
Example
import java.util.ArrayDeque; public class TaskManagementSystem { public static void main(String[] args) { // Creating an ArrayDeque to store tasks ArrayDeque<Task> tasks = new ArrayDeque<>(); // Adding initial tasks with different priorities tasks.add(new Task("Complete project report", 2)); tasks.add(new Task("Email client updates", 1)); tasks.add(new Task("Prepare presentation", 3)); // Using forEach to log task details tasks.forEach(task -> System.out.println("Logging task: " + task)); } } class Task { private String description; private int priority; public Task(String description, int priority) { this.description = description; this.priority = priority; } @Override public String toString() { return description + " (Priority: " + priority + ")"; } }
Output:
Logging task: Complete project report (Priority: 2) Logging task: Email client updates (Priority: 1) Logging task: Prepare presentation (Priority: 3)
Conclusion
The ArrayDeque.forEach(Consumer<? super E> action)
method in Java is a versatile tool for performing actions on each element in the deque. Understanding how to use this method allows you to efficiently process and manage elements in the deque, making it particularly useful in applications like task management systems where you need to iterate over tasks and perform specific actions on them.
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