Article:
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Generic Types, Part 1
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Dangerous approximation |
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2005-05-05 13:17:08 |
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lordpixel
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In the article we see this statement:
" A List<?> is effectively read-only since the compiler does not allow us to invoke methods like add( ), set(), and addAll( )."
That's an attractive trap people fall into with List<?>. The trouble is it's not really true. Consider the List.clear() method. It takes no parameters and thus you can call it on a List<?>.
If you want a truly read-only list, you still need to use Collections.unmodifiableList()
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Dangerous approximation
2007-05-17 05:42:31
y2mehul
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