sampleconstructor.java

初期JAVA学习非常有用的资料。帮助深入了解API。特别是Applet。

/*
 * Copyright (c) 1995-1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies. Please refer to the file "copyright.html"
 * for further important copyright and licensing information.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */

import java.lang.reflect.*;
import java.awt.*;

class SampleConstructor {

   public static void main(String[] args) {
      Rectangle r = new Rectangle();
      showConstructors(r);
   }

   static void showConstructors(Object o) {
      Class c = o.getClass();
      Constructor[] theConstructors = c.getConstructors();
      for (int i = 0; i < theConstructors.length; i++) {
         System.out.print("( ");
         Class[] parameterTypes = theConstructors[i].getParameterTypes();
         for (int k = 0; k < parameterTypes.length; k ++) {
            String parameterString = parameterTypes[k].getName();
            System.out.print(parameterString + " ");
            }
         System.out.println(")");
         }
   }
}