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Design Patterns in Java: Puzzles

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Design Patterns in Java: Puzzles

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Riddles exploring Java design patterns.

Created by

Swati Nikam
Swati Nikam
India

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Design Patterns in Java: Puzzles
 

Design Patterns in Java: PuzzlesOnline version

Riddles exploring Java design patterns.

by Swati Nikam
1

I am the gatekeeper of instances, ensuring only one rules the land.

Hints

Common in configuration or logging contexts.

Often accessed via a global-like point of access.

Ensures a single shared instance.

2

I create objects without exposing the exact class, guiding creation through a method.

Hints

Often used to encapsulate object creation.

Involves a creator class with a method to produce products.

Aims for loose coupling by delegating instantiation.

3

I bridge two incompatible partners so they can work together seamlessly.

Hints

Acts as a translator between components.

Useful when reusing legacy or third-party code.

Converts interface of a class into another interface the client expects.

4

I alert dependents to changes and keep them synchronized without tight coupling.

Hints

Common in event-driven and UI programming.

Subjects notify observers upon state changes.

Defines a one-to-many relationship.

5

I represent a value that will arrive in the future and allow you to compose work upon arrival.

Hints

Handles computation results or exceptions when ready.

Supports chaining and composition of tasks.

A Java mechanism for asynchronous computation.

 
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