JEP 455: Primitive Types in Patterns, instanceof, and switch

Author: ibrahimatay

README.md

@@ -12,6 +12,7 @@ This repository contains Java examples that are designed to track and document t
 * [Java 23](java-23/) (September, 2024)
   * [JEP 477](java-23/src/main/java/com/ibrahimatay/JEP477ImplicitlyDeclaredClassesAndInstanceMainMethods.java): Implicitly Declared Classes and Instance Main Methods
   * [JEP 467](java-23/src/main/java/com/ibrahimatay/JEP467MarkdownDocumentationComments.java): Markdown Documentation Comments
+  * [JEP 455](java-23/src/main/java/com/ibrahimatay/JEP455PrimitiveTypesInPatternsInstanceofAndSwitch.java): Primitive Types in Patterns, instanceof, and switch]
 
 * [Java 22](java-22/) (March, 2024)
   * [JEP 458](java-22/src/main/java/com/ibrahimatay/JEP458LaunchMultiFileSourceCode.java): Launch Multi-File Source-Code Programs

java-23/src/main/java/com/ibrahimatay/JEP455PrimitiveTypesInPatternsInstanceofAndSwitch.java

@@ -0,0 +1,36 @@
+package com.ibrahimatay;
+
+public class JEP455PrimitiveTypesInPatternsInstanceofAndSwitch {
+    // JEP 455: Primitive Types in Patterns, instanceof, and switch
+    // https://openjdk.org/jeps/455
+
+    public static void main(String[] args) {
+        System.out.printf("%1$s HTTP status code refers to a %2$s%n", 100, getHTTPCodeDesc(100));
+        System.out.printf("%1$s HTTP status code refers to a %2$s%n", 200, getHTTPCodeDesc(200));
+        System.out.printf("%1$s HTTP status code refers to a %2$s%n", 403, getHTTPCodeDesc(403));
+        System.out.printf("%1$s HTTP status code refers to a %2$s%n", 0, getHTTPCodeDesc(0));
+
+        // 100 HTTP status code refers to a Continue
+        // 200 HTTP status code refers to a OK
+        // 403 HTTP status code refers to a Client Error
+        // 0 HTTP status code refers to a Unknown error
+    }
+
+    public static String getHTTPCodeDesc(int code) {
+        return switch(code) {
+            case 100 -> "Continue";
+            case 200 -> "OK";
+            case 301 -> "Moved Permanently";
+            case 302 -> "Found";
+            case 400 -> "Bad Request";
+            case 500 -> "Internal Server Error";
+            case 502 -> "Bad Gateway";
+            case int i when i > 100 && i < 200 -> "Informational";
+            case int i when i > 200 && i < 300 -> "Successful";
+            case int i when i > 302 && i < 400 -> "Redirection";
+            case int i when i > 400 && i < 500 -> "Client Error";
+            case int i when i > 502 && i < 600 -> "Server Error";
+            default                            -> "Unknown error";
+        };
+    }
+}