Class RecordPatternsPreviewExamples

java.lang.Object

net.jrodolfo.java_evolution.java19.RecordPatternsPreviewExamples

public class RecordPatternsPreviewExamples
extends Object

Demonstrates record patterns as a Java 19 preview feature.

Records made data-carrier classes concise, but extracting values still required accessor calls after checking the type. Record patterns solve that by letting code match and deconstruct a record in the same expression.

Record patterns became final later, in Java 21. The record-pattern form shown here remains syntactically and semantically faithful to the Java 19 preview while documenting that preview origin.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final record	RecordPatternsPreviewExamples.Point	Small record used by the record pattern example.

Constructor Summary

Constructors

Constructor	Description
RecordPatternsPreviewExamples()

Method Summary

Modifier and Type	Method	Description
String	describe(Object value)	Deconstructs a record with an instanceof record pattern.

Methods inherited from class Object

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

Constructor Details

RecordPatternsPreviewExamples

public RecordPatternsPreviewExamples()

Method Details

describe

public String describe(Object value)

Deconstructs a record with an instanceof record pattern.

Parameters:

value - the value to inspect

Returns:

a formatted point description