Demonstrates dynamic usage of methods : Method « Reflection « Java

Demonstrates dynamic usage of methods

 *     file:
 *  package: oreilly.hcj.reflection
 * This software is granted under the terms of the Common Public License,
 * CPL, which may be found at the following URL:
 * Copyright(c) 2003-2005 by the authors indicated in the @author tags.
 * All Rights are Reserved by the various authors.
 ########## DO NOT EDIT ABOVE THIS LINE ########## */

//package oreilly.hcj.reflection;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.DateFormat;
import java.util.Locale;

 * Demonstrates dynamic usage of methods.
 * @author <a>Robert Simmons jr. (kraythe)</a>
 * @version $Revision: 1.3 $
public class MethodUsageDemo {
  /** Date formatter to be used. */
  static final DateFormat DATE_FORMATTER = DateFormat.getDateInstance(DateFormat.SHORT, Locale.US);

   * Ouput the values of the "get" methods.
   * @param obj
   *          The object to output.
   * @throws InvocationTargetException
   *           If an error occurs in calling the get methods.
   * @throws IllegalAccessException
   *           If the security manager rejects access.
  public static final void outputValues(final Object obj) throws InvocationTargetException,
      IllegalAccessException {
    final String PREFIX = "get"; //$NON-NLS-1$
    System.out.println("--- Accessing Get Methods ---");
    Method[] meths = obj.getClass().getMethods();
    for (int idx = 0; idx < meths.length; idx++) {
      if (meths[idx].getName().startsWith(PREFIX)) {
        if (meths[idx].getParameterTypes().length == 0) {
          System.out.print(meths[idx].getName() + " = "); //$NON-NLS-1$
          System.out.println(meths[idx].invoke(obj, null));

   * Main method.
   * @param args
   *          Command line arguments.
   * @throws RuntimeException
   *           If an unforseen error occurs.
  public static void main(final String[] args) {

    try {
      // person.setBirthDate(DATE_FORMATTER.parse("01/12/1971"));

      // Output the object.
      outputValues(new String());
    } catch (final Exception ex) {
      throw new RuntimeException(ex);

/* ########## End of File ########## */


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