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Adding snippets and testing tools
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‎.github/tools/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>tools</artifactId>
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<version>1.0.0</version>
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<groupId>dev.playground</groupId>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>21</maven.compiler.source>
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<maven.compiler.target>21</maven.compiler.target>
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<mainClass>dev.playground.tools.IndexJson</mainClass>
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<junit.version>5.9.2</junit.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter</artifactId>
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<version>${junit.version}</version>
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<scope>compile</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<version>${junit.version}</version>
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<scope>compile</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<version>${junit.version}</version>
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<scope>compile</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<artifactId>maven-jar-plugin</artifactId>
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<version>3.0.2</version>
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<configuration>
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<archive>
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<manifest>
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<addClasspath>true</addClasspath>
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<mainClass>${mainClass}</mainClass>
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</manifest>
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</archive>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.11.0</version>
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<configuration>
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<source>${maven.compiler.source}</source>
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<target>${maven.compiler.target}</target>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.22.1</version>
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</plugin>
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</plugins>
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</build>
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</project>

‎.github/tools/src/main/java/dev/playground/tools/IndexJson.java

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package dev.playground.tools;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.stream.Collectors;
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public class IndexJson {
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static final String rawGithubCDNPrefix = "https://raw.githubusercontent.com/java/playground-snippets/main/";
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public static void main(String[] args) throws IOException {
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if (args.length < 1) {
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System.err.println("USAGE:\n\t[program] <path-to-snippets-folder>");
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System.exit(1);
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}
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var strPath = args[0];
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var path = Path.of(strPath);
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if (!path.toFile().exists()) {
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System.err.printf("Directory %s does not exist!\nUSAGE:\n\t[program] <path-to-snippets-folder>\n", path);
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System.exit(1);
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}
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String result;
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try(var walker = Files.walk(path)) {
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result = walker.filter(f -> !Files.isDirectory(f)).map(key -> {
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var strKey = key.toString().replace(strPath + "/", "");
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var strValue = rawGithubCDNPrefix + strKey;
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return String.format("\t\"%s\": \"%s\"", strKey, strValue);
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}).collect(Collectors.joining(",\n"));
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}
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var indexJsonContent = String.format("{\n%s\n}", result);
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var indexJsonFilePath = Path.of(strPath, "index.json");
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System.out.println(indexJsonFilePath);
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Files.deleteIfExists(indexJsonFilePath);
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indexJsonFilePath.toFile().createNewFile();
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Files.writeString(indexJsonFilePath, indexJsonContent);
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System.out.println(indexJsonContent);
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}
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}

‎.github/tools/src/main/resources/README.md

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# DISCLAIMER
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[snippets](snippets) is a symlink to a [root folder](../../../../../snippets).

‎.github/tools/src/main/resources/snippets/hello-world.snippet

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var name = "Duke";
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System.out.println("Hello, " + name);

‎.github/tools/src/main/resources/snippets/index.json

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{
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"misc/simple-collection.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/misc/simple-collection.snippet",
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"misc/func-interface.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/misc/func-interface.snippet",
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"misc/functions-chaining.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/misc/functions-chaining.snippet",
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"records/composing.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/records/composing.snippet",
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"records/simple.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/records/simple.snippet",
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"records/method-overriding.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/records/method-overriding.snippet",
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"streams/filtering.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/streams/filtering.snippet",
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"streams/stream-to-list.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/streams/stream-to-list.snippet",
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"streams/text-block-to-stream.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/streams/text-block-to-stream.snippet",
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"textblocks/formatting.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/textblocks/formatting.snippet",
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"textblocks/simple.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/textblocks/simple.snippet",
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"textblocks/record.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/textblocks/record.snippet",
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"hello-world.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/hello-world.snippet",
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"switch/expression.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/switch/expression.snippet",
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"switch/pattern-matching.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/switch/pattern-matching.snippet",
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"switch/statement.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/switch/statement.snippet",
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"pattern-matching/record.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/pattern-matching/record.snippet",
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"pattern-matching/switch.snippet": "https://raw.githubusercontent.com/java/playground-snippets/main/pattern-matching/switch.snippet"
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}

‎.github/tools/src/main/resources/snippets/misc/func-interface.snippet

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@FunctionalInterface
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interface MyFunctionalInterface {
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public int incrementByTwo(int a);
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}
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MyFunctionalInterface f = (num) -> num + 2;
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var result = f.incrementByTwo(40);
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System.out.println(result);

‎.github/tools/src/main/resources/snippets/misc/functions-chaining.snippet

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var strings = Arrays.asList("one", null, "three", "", "five", "six");
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Function<String, String> handleNull = s -> s == null ? "": s;
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Function<String, Integer> length = s -> s.length();
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Function<String, Integer> handleNullThenLength = handleNull.andThen(length);
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for (String string : strings) {
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System.out.println(string + " -> length = " + handleNullThenLength.apply(string));
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}

‎.github/tools/src/main/resources/snippets/misc/simple-collection.snippet

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Collection<String> numbers = new ArrayList<>();
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numbers.add("one");
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numbers.add("two");
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numbers.add("three");
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numbers.remove("two");
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System.out.println(numbers);

‎.github/tools/src/main/resources/snippets/pattern-matching/record.snippet

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record Point(int x, int y) {
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public boolean equals(Object other) {
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return other instanceof Point otherPoint &&
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this.x == otherPoint.x && this.y == otherPoint.y;
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}
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}
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Point p1 = new Point(0, 0);
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Point p2 = new Point(1, 1);
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Point p3 = new Point(0, 0);
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System.out.println("p1 equals object? " + p1.equals(new Object()));
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System.out.println("p1 equals p2? " + p1.equals(p2));
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System.out.println("p1 equals p3? " + p1.equals(p3));
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System.out.println("p2 equals p3? " + p2.equals(p3));

‎.github/tools/src/main/resources/snippets/pattern-matching/switch.snippet

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record Point(int x, int y) {}
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record Circle(Point center, int radius) {
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public Circle {
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if (radius < 0) throw new IllegalArgumentException("Radius cant be null");
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}
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}
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ToDoubleFunction<Object> surface = object ->
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switch(object) {
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case null -> throw new AssertionError("Object is null");
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case Circle(Point p, int radius) when radius == 0 -> 0d;
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case Circle(Point p, int radius) -> Math.PI*radius*radius;
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case Object notACircle -> throw new AssertionError("Object is not a circle");
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};
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Circle c1 = new Circle(new Point(0, 0), 0);
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Circle c2 = new Circle(new Point(1, 1), 1);
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System.out.println("Surface of " + c1 + " = " + surface.applyAsDouble(c1));
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System.out.println("Surface of " + c2 + " = " + surface.applyAsDouble(c2));
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surface.applyAsDouble(null);
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surface.applyAsDouble("Not a circle!");

‎.github/tools/src/main/resources/snippets/records/composing.snippet

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record Population(int population) {}
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record City(String name, Population population) {
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// static methods are allowed in records
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public static City of(String name, int p) {
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var population = new Population(p);
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return new City(name, population);
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}
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}
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var paris = City.of("Paris", 2_161);
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System.out.println(paris);

‎.github/tools/src/main/resources/snippets/records/method-overriding.snippet

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record City(String name) {
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public boolean equals(Object other) {
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return other instanceof City(String name) &&
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this.name.equalsIgnoreCase(name);
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}
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public int hashCode() {
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return name != null ? name.toUpperCase().hashCode() : 0;
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}
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}
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var paris1 = new City("Paris");
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var paris2 = new City("paris");
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var paris3 = new City("PARIS");
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System.out.println("1 == 2 ? " + paris1.equals(paris2));
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System.out.println("2 == 3 ? " + paris2.equals(paris3));
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System.out.println("1 == 3 ? " + paris1.equals(paris3));

‎.github/tools/src/main/resources/snippets/records/simple.snippet

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record Player(String last, String first, int level) {}
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var jane = new Player("Doe", "Jane", 42);
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System.out.println(jane);

‎.github/tools/src/main/resources/snippets/streams/filtering.snippet

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List<String> cities =
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Arrays.asList("Shenzhen", "Brussels", "Taipei", "Buenos Aires", "Sydney", "Bristol");
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cities.stream()
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.filter(s -> s.startsWith("B"))
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.map(String::toUpperCase)
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.sorted()
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.forEach(System.out::println);

‎.github/tools/src/main/resources/snippets/streams/stream-to-list.snippet

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Stream<String> stream = Stream.of("Shenzhen", "Brussels", "Taipei", "Buenos Aires", "Sydney", "Bristol");
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List<String> cities = stream.sorted().collect(Collectors.toList());
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System.out.println(cities);

‎.github/tools/src/main/resources/snippets/streams/text-block-to-stream.snippet

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var cities = """
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San Francisco
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Casablanca
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Antwerp
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New Delhi
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Osaka
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""";
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Stream<String> lines = cities.lines();
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System.out.println(lines.toList());

‎.github/tools/src/main/resources/snippets/switch/expression.snippet

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enum Day { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY; }
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Day day = Day.SUNDAY;
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int numLetters = switch (day) {
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case MONDAY, FRIDAY, SUNDAY -> 6;
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case TUESDAY -> 7;
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case THURSDAY, SATURDAY -> 8;
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case WEDNESDAY -> 9;
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};
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System.out.println(numLetters);

‎.github/tools/src/main/resources/snippets/switch/pattern-matching.snippet

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var result = switch ("Lorem Ipsum") {
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case null -> "Oops";
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case "Foo", "Bar" -> "Great";
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default -> "Ok!";
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};
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System.out.println(result);

‎.github/tools/src/main/resources/snippets/switch/statement.snippet

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enum Day { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY; }
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var numberOfChar = 0;
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switch(Day.MONDAY) {
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case MONDAY: case FRIDAY: case SUNDAY:
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numberOfChar = 6;
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break;
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case TUESDAY:
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numberOfChar = 7;
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break;
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case WEDNESDAY:
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numberOfChar = 9;
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break;
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case THURSDAY: case SATURDAY:
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numberOfChar = 8;
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break;
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default:
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throw new IllegalArgumentException();
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}
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System.out.println(numberOfChar);

‎.github/tools/src/main/resources/snippets/textblocks/formatting.snippet

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var message = """
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{"name" : "%s", "language" : "Java"}
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""";
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System.out.println(message.formatted("Duke"));

‎.github/tools/src/main/resources/snippets/textblocks/record.snippet

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record City(String name, int population) {
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public static City of(String line) {
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int indexOfLastSpace = line.lastIndexOf(' ');
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var name = line.substring(0, indexOfLastSpace);
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var population = Integer.parseInt(line.substring(indexOfLastSpace + 1));
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return new City(name, population);
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}
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}
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String cities = """
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New York 8343
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London 8982
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Paris 2161
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Bangaluru 8474
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Singapore 5454
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Tokyo 13960
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""";
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var cityList = cities.lines().map(City::of).toList();
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cityList.forEach(System.out::println);

‎.github/tools/src/main/resources/snippets/textblocks/simple.snippet

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String cities = """
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New York \s
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Paris \s
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Bangalore \s
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Singapore \s
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Tokyo \s
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""";
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cities.lines().map(line -> "|" + line + "|").forEach(System.out::println);

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