sampleset.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 SampleSet {

   public static void main(String[] args) {
      Rectangle r = new Rectangle(100, 20);
      System.out.println("original: " + r.toString());
      modifyWidth(r, new Integer(300));
      System.out.println("modified: " + r.toString());
   }

   static void modifyWidth(Rectangle r, Integer widthParam ) {
      Field widthField;
      Integer widthValue;
      Class c = r.getClass();
      try {
        widthField = c.getField("width");
        widthField.set(r, widthParam);
      } catch (NoSuchFieldException e) {
          System.out.println(e);
      } catch (IllegalAccessException e) {
          System.out.println(e);
      }
   }
}