Class PrimitivePatternsThirdPreviewExamples

java.lang.Object

net.jrodolfo.java_evolution.java25.PrimitivePatternsThirdPreviewExamples

public class PrimitivePatternsThirdPreviewExamples
extends Object

Demonstrates primitive patterns, previewed for the third time in Java 25 by JEP 507.

The repository itself does not compile against preview syntax. Instead, this example writes a small Java 25 source file, compiles it with javac --enable-preview --release 25, and runs it with java --enable-preview when the active toolchain is JDK 25. That keeps the main Maven build stable while still demonstrating the real preview syntax.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final record	PrimitivePatternsThirdPreviewExamples.CommandResult	Result from one child process invocation.
static final record	PrimitivePatternsThirdPreviewExamples.PrimitivePatternsWorkflowResult	Result from compiling and running the generated preview source.

Constructor Summary

Constructors

Constructor	Description
PrimitivePatternsThirdPreviewExamples()

Method Summary

Modifier and Type	Method	Description
String	previewBoundary()	Explains why this example uses a child process.
String	probeSource()	Source used by the child JVM to exercise Java 25 preview syntax.
String	purpose()	Explains the feature goal.
PrimitivePatternsThirdPreviewExamples.PrimitivePatternsWorkflowResult	runPrimitivePatternsWorkflow(Path workspace)	Runs a real Java 25 preview primitive-pattern workflow.
String	safetyGoal()	Explains the safety benefit of primitive patterns.
String	testBoundary()	Explains what this executable example can and cannot prove.

Methods inherited from class Object

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

Constructor Details

PrimitivePatternsThirdPreviewExamples

public PrimitivePatternsThirdPreviewExamples()

Method Details

runPrimitivePatternsWorkflow

public PrimitivePatternsThirdPreviewExamples.PrimitivePatternsWorkflowResult runPrimitivePatternsWorkflow(Path workspace)
                                                                                                   throws IOException,
InterruptedException

Runs a real Java 25 preview primitive-pattern workflow. Full child-compilation execution requires a JDK 25 preview compiler.

Parameters:

workspace - temporary directory for generated source and class files

Returns:

result containing compilation and execution output

Throws:

IOException - when the source file cannot be written

InterruptedException - when waiting for a child process is interrupted

probeSource

public String probeSource()

Source used by the child JVM to exercise Java 25 preview syntax.

Returns:

generated Java source

purpose

public String purpose()

Explains the feature goal.

Returns:

a short explanation

safetyGoal

public String safetyGoal()

Explains the safety benefit of primitive patterns.

Returns:

a short safety explanation

previewBoundary

public String previewBoundary()

Explains why this example uses a child process.

Returns:

the preview boundary

testBoundary

public String testBoundary()

Explains what this executable example can and cannot prove.

Returns:

the test boundary