Call a member function to get the value : Method « Reflection « Java Tutorial

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Java Tutorial » Reflection » Method 
7.5.7.Call a member function to get the value
// $Id: ReflectionHelper.java 16271 2009-04-07 20:20:12Z hardy.ferentschik $
/*
* JBoss, Home of Professional Open Source
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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
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*/


import java.beans.Introspector;
import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.WildcardType;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;


/**
 * Some reflection utility methods.
 *
 @author Hardy Ferentschik
 */
public class ReflectionHelper {

  public static Object getValue(Member member, Object object) {
    Object value = null;

    if member instanceof Method ) {
      Method method = Method member;
      try {
        value = method.invokeobject );
      }
      catch IllegalAccessException e ) {
        throw new RuntimeException"Unable to access " + method.getName(), e );
      }
      catch InvocationTargetException e ) {
        throw new RuntimeException"Unable to access " + method.getName(), e );
      }
    }
    else if member instanceof Field ) {
      Field field = Field member;
      try {
        value = field.getobject );
      }
      catch IllegalAccessException e ) {
        throw new RuntimeException"Unable to access " + field.getName(), e );
      }
    }
    return value;
  }

}
7.5.Method
7.5.1.List methods of a class using Reflection
7.5.2.Design your own class loader
7.5.3.Get method my parameters
7.5.4.Show public methods.
7.5.5.Method Inspector
7.5.6.Invoke methods of an object using reflection
7.5.7.Call a member function to get the value
7.5.8.Prints out the declared methods on java.lang.Number
7.5.9.Demonstrates how to get simple method information
7.5.10.Prints out the declared methods on java.lang.Object
7.5.11.Demonstrates how to get specific method information
7.5.12.Get the current method name
7.5.13.Get the current method name With JDK1.5
7.5.14.Get method from a class by name
7.5.15.Get super class and all its declared methods
7.5.16.Invoke a method with parameter
7.5.17.Call a class method with 2 arguments
7.5.18.Call all possible exceptions during method invocation with reflection
7.5.19.get Declared Method by name and parameter type
7.5.20.Getting the Methods of a Class Object: By obtaining a list of all declared methods
7.5.21.Getting the Methods of a Class Object: By obtaining a list of all public methods, both declared and inherited.
7.5.22.Getting the Methods of a Class Object: By obtaining a particular Method object.
7.5.23.Invoke method with wrong parameters
7.5.24.Checks whether the specified class contains a method matching the specified name.
7.5.25.Find method
7.5.26.Returns method with the specified name
7.5.27.Sorts methods according to their name, number of parameters, and parameter types.
7.5.28.Contains Same Method Signature
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