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how to delete the map elements when iterating the map

 
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I want to delete some elements when iterating the map.

Like this.


but it will fail and throw java.util.ConcurrentModificationException. So How can I modify the map when iterating it.
I want to know a convenient method which do not need many codes.
Thanks
 
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replace line 19 with:
 
jing hu
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Thanks, I get it.
 
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