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mperormperor
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Update test class for Java 14 ...
- samples only for standard features - markdown javadoc for JEPs - organize classes related to Java 14 - improve code readability
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-32
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‎src/test/java/pl/mperor/lab/java/Java12.java‎

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@@ -16,24 +16,6 @@
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*/
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public class Java12 {
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@Test
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public void testSwitchExpression() {
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Assertions.assertEquals("Working Day", getTypeOfDayByNumber(1));
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Assertions.assertEquals("Day Off", getTypeOfDayByNumber(6));
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Assertions.assertThrows(IllegalStateException.class, () -> getTypeOfDayByNumber(0));
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}
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private String getTypeOfDayByNumber(int dayOfWeek) {
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return switch (dayOfWeek) {
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case 1, 2, 3, 4, 5 -> "Working Day";
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case 6, 7 -> {
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// code block example
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yield "Day Off";
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}
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default -> throw new IllegalStateException("Unexpected value: " + dayOfWeek);
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};
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}
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@Test
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public void testStringIndentAndTransformMethods() {
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String text = "Hello\nJava 12\n";

‎src/test/java/pl/mperor/lab/java/Java14.java‎

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@@ -1,21 +1,121 @@
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package pl.mperor.lab.java;
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import jdk.jfr.Configuration;
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import jdk.jfr.Event;
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import jdk.jfr.Label;
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import jdk.jfr.Name;
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import jdk.jfr.consumer.RecordingStream;
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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.Test;
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import java.util.Objects;
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import java.io.IOException;
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import java.text.ParseException;
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import java.time.Duration;
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/**
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* Java 14 (March 2020)
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*/
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import static org.junit.jupiter.api.Assertions.assertTrue;
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/// Java 14™ (March 2020)
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/// [JDK 14](https://openjdk.org/projects/jdk/14)
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///
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/// - STANDARD FEATURES:
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/// - 361: Switch Expressions (Standard)
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/// - 358: Helpful NullPointerExceptions
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/// - 367: Remove the Pack200 Tools and API
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/// - 345: NUMA-Aware Memory Allocation for G1 (`+XX:+UseNUMA`)
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/// - 363: Remove the Concurrent Mark Sweep (CMS) Garbage Collector (`-XX:+UseConcMarkSweepGC`)
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/// - 349: JFR Event Streaming (`-XX:StartFlightRecording:filename=events.jfr`) [JFAPI](https://docs.oracle.com/en/java/javase/23/jfapi/)
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/// - 352: Non-Volatile Mapped Byte Buffers
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/// - 364: ZGC on macOS
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/// - 365: ZGC on Windows
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/// - 362: Deprecate the Solaris and SPARC Ports
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/// - 366: Deprecate the ParallelScavenge + SerialOld GC Combination (`-XX:-UseParallelOldGC`)
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///
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/// - PREVIEW & INCUBATOR:
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/// - 359: Records (Preview)
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/// - 305: Pattern Matching for instanceof (Preview)
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/// - 368: Text Blocks (Second Preview)
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/// - 343: Packaging Tool `jpackage` (Incubator)
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/// - 370: Foreign-Memory Access API (Incubator)
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public class Java14 {
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@Test
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public void testSwitchExpression() {
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Assertions.assertEquals("Working Day", getTypeOfDayByNumber(1));
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Assertions.assertEquals("Day Off", getTypeOfDayByNumber(6));
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Assertions.assertThrows(IllegalStateException.class, () -> getTypeOfDayByNumber(0));
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}
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private String getTypeOfDayByNumber(int dayOfWeek) {
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return switch (dayOfWeek) {
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case 1, 2, 3, 4, 5 -> "Working Day";
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case 6, 7 -> {
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// code block example
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yield "Day Off";
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}
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default -> throw new IllegalStateException("Unexpected value: " + dayOfWeek);
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};
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}
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@Test
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public void testSwitchStatementVsSwitchExpression() {
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assertTrue(switchExpression(Switch.EXPRESSION));
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assertTrue(switchStatement(Switch.STATEMENT));
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}
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enum Switch {EXPRESSION, STATEMENT}
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private static boolean switchExpression(Switch s) {
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return switch (s) {
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case EXPRESSION -> true;
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default -> false;
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};
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}
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private static boolean switchStatement(Switch s) {
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switch (s) {
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case STATEMENT -> {
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return true;
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}
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default -> {
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return false;
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}
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}
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}
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@Test
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public void testHelpfulNullPointerExceptions() {
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NullPointerException exception = Assertions.assertThrows(NullPointerException.class, () -> {
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String name = null;
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int length = name.length();
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name.length();
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});
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Assertions.assertTrue(exception.getMessage().contains("Cannot invoke \"String.length()\" because \"name\" is null"));
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assertTrue(exception.getMessage().contains("Cannot invoke \"String.length()\" because \"name\" is null"));
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}
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@Test
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public void testPack200ToolsAndAPIRemoved() {
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Assertions.assertThrows(ClassNotFoundException.class, () -> {
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Class.forName("java.util.jar.Pack200");
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});
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}
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@Test
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public void testThreadIsInterruptedAlwaysAvailable() {
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Thread neverStartedThread = new Thread();
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Assertions.assertFalse(neverStartedThread.isInterrupted());
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neverStartedThread.interrupt();
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Assertions.assertTrue(neverStartedThread.isInterrupted());
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}
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@Test
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public void testJFREvent() throws IOException, ParseException, InterruptedException {
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Configuration c = Configuration.getConfiguration("profile");
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try (RecordingStream rs = new RecordingStream(c)) {
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rs.onEvent("jdk.ThreadSleep", event -> event.getDuration().equals(Duration.ofSeconds(100)));
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rs.startAsync();
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System.out.println("Sleeping for 100ms...");
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Thread.sleep(100);
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}
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}
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}

‎src/test/java/pl/mperor/lab/java/Java15.java‎

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/// - 371: Hidden Classes
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/// - 372: Remove the Nashorn JavaScript Engine
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/// - 373: Reimplement the Legacy DatagramSocket API
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/// - 374: Disable and Deprecate Biased Locking
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/// - 377: ZGC: A Scalable Low-Latency Garbage Collector
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/// - 379: Shenandoah: A Low-Pause-Time Garbage Collector
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/// - 374: Disable and Deprecate Biased Locking (-XX:+UseBiasedLocking)
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/// - 377: ZGC: A Scalable Low-Latency Garbage Collector (-XX:+UseZGC)
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/// - 379: Shenandoah: A Low-Pause-Time Garbage Collector (-XX:+UseShenandoahGC)
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/// - 381: Remove the Solaris and SPARC Ports
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/// - 385: Deprecate RMI Activation for Removal [Java17#testRmiActivationRemoved()]
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///
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"password": "*****"
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}
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""";
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Assertions.assertTrue(json.contains("\"login\": \"admin\""));
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String skippedLines = """
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a\
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b\
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c\
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""";
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Assertions.assertEquals("abc", skippedLines);
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String notSkippedSpaces = """
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a \s
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b\s
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c""";
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Assertions.assertEquals("a \nb \nc", notSkippedSpaces);
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}
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@Test

‎src/test/java/pl/mperor/lab/java/Java16.java‎

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/// - 395: Records
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/// - 394: Pattern Matching for instanceof
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/// - 390: Warnings for Value-Based Classes
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/// - 392: Packaging Tool
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/// - 392: Packaging Tool 'jpackage'
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/// - 380: Unix-Domain Socket Channels
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/// - 396: Strongly Encapsulate JDK Internals by Default [Java17#testStronglyEncapsulatedInternals()]
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/// - 376: ZGC: Concurrent Thread-Stack Processing
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/// - 338: Vector API (Incubator)
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public class Java16 {
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// POJOs
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// POJOs with accessors (without getters)
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@Test
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public void testPairRecord() {
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var pair = Pair.of("Boy", "Girl");

‎src/test/java/pl/mperor/lab/java/Java9.java‎

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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.condition.DisabledOnJre;
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import org.junit.jupiter.api.condition.JRE;
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import java.io.File;
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import java.io.FileWriter;

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