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






// $Id: ReflectionHelper.java 16271 2009-04-07 20:20:12Z hardy.ferentschik $
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* Licensed under the Apache License, Version 2.0 (the "License");
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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 {

  /**
   * 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;
    }
  }
}








7.4.Field
7.4.1.Recursively get all fields for a hierarchical class tree
7.4.2.Reflect All
7.4.3.System class reflection
7.4.4.Get all declared fields from a class
7.4.5.Getting the Field Objects of a Class Object: By obtaining a list of all declared fields.
7.4.6.Getting the Field Objects of a Class Object: By obtaining a list of all public fields, both declared and inherited.
7.4.7.Getting the Field Objects of a Class Object: By obtaining a particular Field object.
7.4.8.Reflection, Introspection, and Naming
7.4.9.Get the name of a primitive type
7.4.10.Getting and Setting the Value of a Field (assumes that the field has the type int)
7.4.11.Retrieving a Predefined Color by Name
7.4.12.Get a variable value from the variable name
7.4.13.Return a list of all fields (whatever access status, and on whatever superclass they were defined) that can be found on this class.
7.4.14.Checks whether the specified class contains a field matching the specified name.
7.4.15.Return Retrurns the Type of the given Field or Method