Set the value of the field of the object to the given value.

       
//package tester.utilities;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

import sun.reflect.FieldAccessor;
import sun.reflect.ReflectionFactory;

/**
 * This class can be used to set field values regardless of the modifiers.
 * 
 * @author Weston Jossey
 * @since Feb 1 2009
 */
public class ReflectionHelper {

  private static final String MODIFIERS_FIELD = "modifiers";

  private static final ReflectionFactory reflection = ReflectionFactory
      .getReflectionFactory();

  /**
   * Set the value of the field of the object to the given value.
   * 
   * @param original
   *            object to modify
   * @param field
   *            field to modify
   * @param value
   *            new value for the given object and field
   * @throws NoSuchFieldException
   * @throws IllegalAccessException
   */
  public static void setStaticFinalField(Object original, Field field,
      Object value) throws NoSuchFieldException, IllegalAccessException {
    // we mark the field to be public
    field.setAccessible(true);
    // next we change the modifier in the Field instance to
    // not be final anymore, thus tricking reflection into
    // letting us modify the static final field
    Field modifiersField = Field.class.getDeclaredField(MODIFIERS_FIELD);
    modifiersField.setAccessible(true);
    int modifiers = modifiersField.getInt(field);
    // blank out the final bit in the modifiers int
    modifiers &= ~Modifier.FINAL;
    modifiersField.setInt(field, modifiers);
    FieldAccessor fa = reflection.newFieldAccessor(field, false);
    fa.set(original, value);
  }
}

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Set the value of the field of the object to the given value. : Field « Reflection « Java

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