Accurate Guesser

Java Swing number guessing game demonstrating event-driven UI patterns.

JavaSwingMVCEvent-Driven

Interactive Demo

Guess the Number (1-100)Attempts: 0

INITIAL

PLAYING

FINISHED

Explicit states prevent edge cases like submitting after winning

GameEngine

Core game logic: random number, guess validation, scoring, state transitions

GameUI (JFrame)

Swing components: input fields, buttons, feedback labels, layout management

Event Handlers

ActionListeners connecting UI actions to game logic callbacks

Event-Driven Architecture

Loose coupling through listeners. Callback-based control flow applicable to React, Vue.

State Management

Without explicit states, edge cases emerge. Manual tracking doesn't scale to complex apps.

Separation of Concerns

Mixing UI with logic creates brittle code. Refactoring to MVC enabled independent testing.

Defense in Depth Validation

UI-level (DocumentFilter), app-level (range), domain-level (state). Each catches different failures.

Swing over JavaFX

Maturity and extensive documentation. Ideal for learning event-driven fundamentals without framework abstractions.

Explicit State Machine

INITIAL → PLAYING → FINISHED prevents invalid operations. Makes transitions explicit and testable.

UI-Layer Input Validation

DocumentFilter for numeric input provides immediate feedback while GameEngine handles business rules.

Modal Dialogs for State Changes

JOptionPane for win/loss notifications creates clear breakpoints. Prevents accidental resets.

Java

Language

Swing

UI Framework

Game States

MVC

Architecture

"Simple concepts can teach foundational programming principles that scale to complex applications."