Question on using WildCards

I just can't figure out why below codes compile with errors
        List<? extends Object> output = new LinkedList<Object>(); //line 7
        output.add(new Object()); //line 8Compilation Errors:
D:\my_NetBeansProjects\JavaBook\Mock\src\BackLister.java:8: cannot find symbol
symbol  : method add(java.lang.Object)
location: interface java.util.List<capture#325 of ? extends java.lang.Object>
        output.add(new Object());
Note: D:\my_NetBeansProjects\JavaBook\Mock\src\Sortee.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
BUILD FAILED (total time: 1 second)Line 7 is ok, so I wonder HOW can we use it in practical? As if line 8 fails, it seems useless!
It is a mock question of SCJP 6 from a book.

roamer wrote:
Back to the topic.
List<? extends Object> output = new LinkedList<Object>();1. If it is a read-only list, in what situation will we use it? It seems that we never use it apart from exam question.
Edited by: roamer on 2010?1?9? ??6:24I didn't say that you use that exact line, but you could e.g. use List<? extends SomeType> as the type of the argument for a method that e.g. counts frequency or does something else that it only needs to iterate over values and read data.
Kaj

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