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/**
* Copyright (c) 2024 Araf Karsh Hamid
* <p>
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* <p>
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* <p>
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
* <p>
* or (per the licensee's choosing)
* <p>
* under the terms of the Apache 2 License version 2.0
* as published by the Apache Software Foundation.
*/
package java18;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.reflect.Method;
import static java.lang.System.out;
/**
* JavaExamples / ReflectionExample
*
* JEP 416: Reimplement Core Reflection with Method Handles
*
* Java 18 reimplements parts of the core reflection using MethodHandles to improve performance
* and reduce the maintenance burden.
*
* @author: Araf Karsh Hamid
* @version: 0.1
* @date: 2024-09-29T21:29
*/
public class ReflectionExample {
public static void main(String[] args) throws Throwable {
// Java 18
out.println("JAVA 18 >>>>>--------------------------------------------------------");
oldModel();
newModel();
}
/**
* Old API Model
* @throws Throwable
*/
public static void oldModel() throws Throwable {
out.println("Old Reflection Model... ");
// Obtain the Class object for String
Class<String> stringClass = String.class;
// Get the method reference to `toUpperCase` with no parameters
Method toUpperCaseMethod = stringClass.getMethod("toUpperCase");
// Invoke the method on an instance of String
String result = (String) toUpperCaseMethod.invoke("hello");
System.out.println(result); // Outputs: HELLO
}
/**
* New Much Simpler high performance API
* @throws Throwable
*/
public static void newModel() throws Throwable {
out.println("New Reflection Model... ");
MethodHandles.Lookup lookup = MethodHandles.lookup();
MethodHandle handle = lookup.findVirtual(String.class, "toUpperCase", MethodType.methodType(String.class));
String result = (String) handle.invoke("hello");
System.out.println(result);
}
}