检查该方法是否被传递的方法集合中的任何方法重写。
/* * JBoss, Home of Professional Open Source. * Copyright 2007, Red Hat Middleware LLC, and individual contributors * as indicated by the @author tags. See the copyright.txt file in the * distribution for a full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ import java.lang.reflect.Method; import java.lang.reflect.Modifier; import java.util.ArrayList;/**来 自 nowjava.com - 时代Java**/ import java.util.Arrays; import java.util.HashMap; import java.util.LinkedHashSet; import java.util.List; import java.util.Map; import java.util.Set; public class Main{ private static Map<Class<?>, Class<?>> primitiveWrapperMap = new HashMap<Class<?>, Class<?>>(); public static boolean isOverridden(Class<?> icptr, Method method) { if (Modifier.isPrivate(method.getModifiers())) return false; try { Method bottomMethod = getMethod(icptr, method.getName(), method.getParameterTypes()); if (bottomMethod.getDeclaringClass() == method .getDeclaringClass()) { return false;/** 来自 时 代 J a v a**/ } return true; } catch (NoSuchMethodException e) { throw new RuntimeException(e); } } /** * Checks whether the <code>method</code> is overriden by any of the methods * *in the passed collection of <code>methods</code>*. Returns true if the method * is overriden by any of the passed methods, else returns false. * * @param method * @param methods * @return */ public static boolean isOverridden(Method method, Method... methods) { for (Method someMethod : methods) { // first compare the names, if not equal then no // point in do other checks. if (!method.getName().equals(someMethod.getName())) { // skip and move to next continue; } // Now check the params if (method.getParameterTypes().length != someMethod .getParameterTypes().length) { // skip continue; } // param types if (!checkParameters(method.getParameterTypes(), someMethod.getParameterTypes())) { // skip continue; } // check the declaring class, if it's the same, then // we are checking the method on the same class, so NOT overridden if (method.getDeclaringClass().equals( someMethod.getDeclaringClass())) { // skip continue; } // the final check to see whether the declaring class // of the method being compared is a superclass of the other method. // If yes, then the method is overridden if (method.getDeclaringClass().isAssignableFrom( someMethod.getDeclaringClass())) { // yes, this method is overridden return true; } } // the method is not overridden return false; } /** * Returns the method with the specified method name. * * (Slow method) * * @param methodName * @return * @throws NoSuchMethodException */ public static Method getMethod(Class<?> cls, String methodName) throws NoSuchMethodException { if (cls == null) throw new NoSuchMethodException(methodName); Method methods[] = cls.getDeclaredMethods(); for (Method method : methods) { if (method.getName().equals(methodName)) return method; // TODO: shall we continue search for ambiguous match? } try { return getMethod(cls.getSuperclass(), methodName); } catch (NoSuchMethodException e) { throw new NoSuchMethodException("No method named " + methodName + " in " + cls + " (or super classes)"); } } /** * Returns the method with the specified method name and parameters. * * @param cls * @param methodName * @param params * @return * @throws NoSuchMethodException */ public static Method getMethod(Class<?> cls, String methodName, Class<?>... params) throws NoSuchMethodException { if (cls == null) { throw new NoSuchMethodException("Class is null " + methodName); } Method m = getDeclaredMethod(cls, methodName, params); if (m == null) { throw new NoSuchMethodException("No method named " + methodName + "(" + (params != null ? Arrays.toString(params) : "") + ") in " + cls + " (or super classes)"); } return m; } private static boolean checkParameters(Class<?> parameterTypes[], Class<?> methodParameterTypes[]) { if (parameterTypes.length != methodParameterTypes.length) return false; for (int i = 0; i < parameterTypes.length; i++) { Class<?> methodParameterType = methodParameterTypes[i]; if (methodParameterType.isPrimitive()) methodParameterType = primitiveWrapperMap .get(methodParameterType); Class<?> parameterType = parameterTypes[i]; if (parameterType.isPrimitive()) parameterType = primitiveWrapperMap.get(parameterType); if (!methodParameterType.isAssignabl