Class PatternMatchingSwitchExamples

java.lang.Object

net.jrodolfo.java_evolution.java21.PatternMatchingSwitchExamples

public class PatternMatchingSwitchExamples
extends Object

Demonstrates pattern matching for switch, finalized in Java 21.

Before this feature, type-based dispatch usually meant an if chain with repeated instanceof checks and casts. Pattern matching for switch lets the switch expression branch directly on type patterns.

The feature is especially strong with sealed hierarchies because the compiler knows the permitted implementations and can help verify exhaustive handling.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	PatternMatchingSwitchExamples.Command	Closed command hierarchy used to demonstrate exhaustive switch handling.
static final record	PatternMatchingSwitchExamples.Restart	Restarts a service.
static final record	PatternMatchingSwitchExamples.Start	Starts a service.
static final record	PatternMatchingSwitchExamples.Stop	Stops a service.

Constructor Summary

Constructors

Constructor	Description
PatternMatchingSwitchExamples()

Method Summary

Modifier and Type	Method	Description
String	describe(PatternMatchingSwitchExamples.Command command)	Handles a sealed command hierarchy with switch patterns.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

PatternMatchingSwitchExamples

public PatternMatchingSwitchExamples()

Method Details

describe

public String describe(PatternMatchingSwitchExamples.Command command)

Handles a sealed command hierarchy with switch patterns.

Parameters:

command - the command to describe

Returns:

a command description