查找方法

//package com.nowjava;
/*来自 时代Java公众号 - N o w J a  v a . c o m*/

import java.lang.reflect.Method;

import java.util.Arrays;


public class Main {

  public static Method findMethod(Class<?> beanClass, boolean allowNonPublic, String name, Class<?>[] argumentTypes) {

    Method[] candidates = allowNonPublic ? beanClass.getDeclaredMethods() : beanClass.getMethods();

    sortMethods(candidates);

    for (Method candidate : candidates) {

      if (candidate.getName().equals(name) && matchParameterTypes(candidate.getParameterTypes(), argumentTypes)) {

        return candidate;

      }

    }

    return null;

  }


  private static <T> void sortMethods(Method[] methods) {

    Arrays.sort(methods,

        (method1, method2) -> compareParameterTypes(method1.getParameterTypes(), method2.getParameterTypes()));/** 来自 nowjava.com**/

  }


  private static boolean matchParameterTypes(Class<?>[] parameterTypes, Class<?>[] argumentTypes) {

    if (parameterTypes.length == argumentTypes.length) {

      boolean match = true;

      for (int i = 0; i < parameterTypes.length; i++) {

        if (!parameterTypes[i].isAssignableFrom(argumentTypes[i])) {

          match = false;

          break;

        }

      }

      return match;

    } else {

      return false;

    }

  }


  private static int compareParameterTypes(Class<?>[] parameterTypes1, Class<?>[] parameterTypes2) {

    if (parameterTypes1.length != parameterTypes2.length) {

      return 0;

    } else {

      int result = 0;

      for (int i = 0; result == 0 && i < parameterTypes1.length; i++) {

        Class<?> parameterType1 = parameterTypes1[i];