Checks whether the specified class contains a field matching the specified name. : Field « Reflection « Java






Checks whether the specified class contains a field matching the specified name.

      
// $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
* limitations under the License.
*/
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 {

  /**
   * Checks whether the specified class contains a field matching the specified name.
   *
   * @param clazz The class to check.
   * @param fieldName The field name.
   *
   * @return Returns <code>true</code> if the cass contains a field for the specified name, <code>
   *         false</code> otherwise.
   */
  public static boolean containsField(Class<?> clazz, String fieldName) {
    try {
      clazz.getDeclaredField( fieldName );
      return true;
    }
    catch ( NoSuchFieldException e ) {
      return false;
    }
  }
}

   
    
    
    
    
    
  








Related examples in the same category

1.Field Reflection
2.How to set public field objects
3.Class Reflection: field informationClass Reflection: field information
4.Object Reflection: get field valueObject Reflection: get field value
5.Object Reflection: set valueObject Reflection: set value
6.Get field of a class object and set or get its value
7.All Fields Snippet
8.Field modifiers: isSynthetic, isEnumConstant
9.Field with annotations
10.Set private field value
11.Get fields of a class object
12.Get all object accessible public fields
13.Getting the Field Objects of a Class Object: By obtaining a list of all declared fields.
14.Getting the Field Objects of a Class Object: By obtaining a list of all public fields, both declared and inherited.
15.Getting the Field Objects of a Class Object: By obtaining a particular Field object.
16.Get all declared fields from a class
17.Retrieving a Predefined Color by Name
18.Get a variable value from the variable name
19.Fetches all fields of all access types from the supplied class and super classes
20.whether given field is a "public static final" constant
21.Process bean properties getter by applying the JavaBean naming conventions.
22.Fetches the property descriptor for the named property of the supplied class
23.Find Field
24.Return a list of all fields (whatever access status, and on whatever superclass they were defined) that can be found on this class.
25.Get all fields of a class.
26.Find field 2
27.Get class field/property
28.Accessible Field Iterator
29.Adds all Fields (from Class.getFields) to the list
30.Retrieve a value from a property
31.Set the value of the field of the object to the given value.
32.Fast Property accessor for a single class.