Returns attribute's setter method. If the method not found then NoSuchMethodException will be thrown. : JavaBeans « Development « Java Tutorial

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import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

public class Main {

  /**
   * Returns attribute's setter method. If the method not found then
   * NoSuchMethodException will be thrown.
   * 
   * @param cls
   *          the class the attribute belongs to
   * @param attr
   *          the attribute's name
   * @param type
   *          the attribute's type
   * @return attribute's setter method
   * @throws NoSuchMethodException
   *           if the setter was not found
   */
  public final static Method getAttributeSetter(Class cls, String attr, Class type)
      throws NoSuchMethodException {
    StringBuffer buf = new StringBuffer(attr.length() + 3);
    buf.append("set");
    if (Character.isLowerCase(attr.charAt(0))) {
      buf.append(Character.toUpperCase(attr.charAt(0))).append(attr.substring(1));
    } else {
      buf.append(attr);
    }

    return cls.getMethod(buf.toString(), new Class[] { type });
  }
}