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design development graphic site web characters)); Field t = c.getDeclaredField("twin"); out.format(fmt, "before", "twin", book.twin); t.set(book, Tweedle.
design development graphic site web DUM); out.format(fmt, "after", "twin", t.get(book)); // production code should handle these exceptions more gracefully } catch (NoSuchFieldException x) catch (IllegalAccessException x) } } This is the corresponding output: $ java Book BEFORE: chapters = 0 AFTER: chapters = 12 BEFORE: characters = [Alice, White Rabbit] AFTER: characters = [Queen, King] BEFORE: twin = DEE AFTER: twin = DUM Note: Setting a field's value via reflection has a certain amount of performance overhead because various operations must occur such as validating access permissions. From the runtime's point of view, the effects are the same, and the operation is as atomic as if the value was changed in the class code directly. Use of reflection can cause some runtime optimizations to be lost.
design development graphic site web For example, the following code is highly likely be optimized by a Java virtual machine: int x = 1; x = 2; x = 3; Equivalent code using Field.set*() may not. « Previous • Trail • Next » Problems with the examples? Try Compiling and Running the Examples: FAQs. Complaints? Compliments? Suggestions? Give us your feedback. Copyright 1995-2007 Sun Microsystems, Inc.
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