Conversion of MethodHandle

ConversionTest.java

/*
 * Copyright 2003-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class ConversionTest {
    public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        MethodHandle handle = MethodHandles.publicLookup().findVirtual(ConversionTest.class, "foo", MethodType.methodType(Integer.TYPE));
        Method m = MethodHandles.reflectAs(Method.class, handle);
        ConversionTest test = new ConversionTest();
        Object result = m.invoke(test);
        System.out.println("result = " + result);
    }

    public int foo() { return 123; }
}