Unicode Emoji Methods

ibrahimatay · Nov 21, 2023 · da2f152 · da2f152
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diff --git a/README.md b/README.md
@@ -9,6 +9,14 @@ This repository contains Java examples that are designed to track and document t
   * [JEP 430](java-21/src/main/java/com/ibrahimatay/JEP430StringTemplates.java): String Templates
   * [JEP 431](java-21/src/main/java/com/ibrahimatay/JEP431SequencedCollections.java): Sequenced Collections
   * [JEP 444](java-21/src/main/java/com/ibrahimatay/JEP444VirtualThreads.java): Virtual Threads
+  * API Improvements
+    * [Unicode Emoji Methods](java-21/src/main/java/com/ibrahimatay/UnicodeEmojiMethods.java)
+      * `isEmoji(int codePoint)`
+      * `isEmojiPresentation(int codePoint)`
+      * `isEmojiModifier(int codePoint)`
+      * `isEmojiModifierBase(int codePoint)`
+      * `isEmojiComponent(int codePoint)`
+      * `isExtendedPictographic(int codePoint)`
 
 * [Java 17](java-17/) (September, 2021)
   * [JEP 409](java-17/src/main/java/com/ibrahimatay/JEP409SealedClasses.java): Sealed Classes

diff --git a/java-21/src/main/java/com/ibrahimatay/UnicodeEmojiMethods.java b/java-21/src/main/java/com/ibrahimatay/UnicodeEmojiMethods.java
@@ -0,0 +1,52 @@
+package com.ibrahimatay;
+
+import java.util.OptionalInt;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class UnicodeEmojiMethods {
+
+    // Unicode Emoji Properties
+    // https://bugs.openjdk.org/browse/JDK-8303018
+
+    // JDK 21 JavaDoc for java.lang.Character
+    // https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Character.html
+
+    // Unicode® Technical Standard #Emoji Character Properties
+    // https://unicode.org/reports/tr51/#Emoji_Properties_and_Data_Files
+
+    public static void main(String[] args) {
+        String welcomeMsg = "Hey Java Developers! ☕️";
+
+        if(welcomeMsg.codePoints().anyMatch(Character::isEmoji)) {
+            System.out.println("Message contains an emoji!");
+        }
+
+        Matcher matcher = Pattern.compile("\\p{IsEmoji}").matcher(welcomeMsg);
+        if(matcher.find()) {
+            System.out.println("Message contains an emoji!");
+        }
+
+        Matcher matcher_modifier_base = Pattern.compile("\\p{IsEmoji_Modifier_Base}").matcher(welcomeMsg);
+        if(matcher_modifier_base.find()) {
+            System.out.println("Message contains an emoji modifier base!");
+        }
+
+        OptionalInt emojiOptional = welcomeMsg.codePoints().filter(Character::isEmoji).findFirst();
+        if (emojiOptional.isPresent()) {
+            int emojiCodePoint = emojiOptional.getAsInt();
+            if (Character.isEmojiModifierBase(emojiCodePoint)) {
+                System.out.println("Emoji can be modified");
+                if (Character.isEmojiModifier(emojiCodePoint)) {
+                    System.out.println("Emoji is modified");
+                } else {
+                    System.out.println("Emoji has not been modified");
+                }
+            } else {
+                System.out.println("Emoji cannot be modified");
+            }
+        } else {
+            System.out.println("No emoji");
+        }
+    }
+}