Demonstrates how to get simple method information : Method « Reflection « Java Tutorial

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Java Tutorial » Reflection » Method 
7.5.9.Demonstrates how to get simple method information
/*
 *     file: MethodInfoDemo.java
 *  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:
 * http://www-124.ibm.com/developerworks/oss/CPLv1.0.htm
 *
 * 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 ########## */

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * Demonstrates how to get simple method information.
 * 
 * @author <a href=mailto:[email protected]>Robert Simmons jr. (kraythe)</a>
 * @version $Revision: 1.3 $
 */
public class MethodInfoDemo {
  /**
   * __UNDOCUMENTED__
   * 
   * @param obj
   *          __UNDOCUMENTED__
   * 
   * @throws IllegalAccessException
   *           __UNDOCUMENTED__
   * @throws InvocationTargetException
   *           __UNDOCUMENTED__
   */
  public static void emptyStrings(final Object obj) throws IllegalAccessException,
      InvocationTargetException {
    final String PREFIX = "set"; //$NON-NLS-1$
    Method[] methods = obj.getClass().getMethods();
    for (int idx = 0; idx < methods.length; idx++) {
      if (methods[idx].getName().startsWith(PREFIX)) {
        if (methods[idx].getParameterTypes()[0] == String.class) {
          methods[idx].invoke(obj, new Object[] { new String() });
        }
      }
    }
  }

  /**
   * Demo method.
   * 
   * @param args
   *          Command line arguments.
   */
  public static void main(final String[] args) {
    String s = "";
    printMethodInfo(s);

    try {
      emptyStrings(s);
    } catch (final Exception ex) {
      ex.printStackTrace();
    }
  }

  /**
   * __UNDOCUMENTED__
   * 
   * @param obj
   *          __UNDOCUMENTED__
   */
  public static void printMethodInfo(final Object obj) {
    Class type = obj.getClass();
    final Method[] methods = type.getMethods();
    for (int idx = 0; idx < methods.length; idx++) {
      System.out.println(methods[idx]);
    }
  }
}

/* ########## End of File ########## */
7.5.Method
7.5.1.List methods of a class using Reflection
7.5.2.Design your own class loader
7.5.3.Get method my parameters
7.5.4.Show public methods.
7.5.5.Method Inspector
7.5.6.Invoke methods of an object using reflection
7.5.7.Call a member function to get the value
7.5.8.Prints out the declared methods on java.lang.Number
7.5.9.Demonstrates how to get simple method information
7.5.10.Prints out the declared methods on java.lang.Object
7.5.11.Demonstrates how to get specific method information
7.5.12.Get the current method name
7.5.13.Get the current method name With JDK1.5
7.5.14.Get method from a class by name
7.5.15.Get super class and all its declared methods
7.5.16.Invoke a method with parameter
7.5.17.Call a class method with 2 arguments
7.5.18.Call all possible exceptions during method invocation with reflection
7.5.19.get Declared Method by name and parameter type
7.5.20.Getting the Methods of a Class Object: By obtaining a list of all declared methods
7.5.21.Getting the Methods of a Class Object: By obtaining a list of all public methods, both declared and inherited.
7.5.22.Getting the Methods of a Class Object: By obtaining a particular Method object.
7.5.23.Invoke method with wrong parameters
7.5.24.Checks whether the specified class contains a method matching the specified name.
7.5.25.Find method
7.5.26.Returns method with the specified name
7.5.27.Sorts methods according to their name, number of parameters, and parameter types.
7.5.28.Contains Same Method Signature
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