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joseph hu

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since Apr 30, 2019
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Recent posts by joseph hu

subclass can cast to parentclass,   but parentclass can't not cast to subclass directly.

below is correct.
2 weeks ago

result: 131074
many connections also can use multiple servers distributed load balancing
4 weeks ago
Please show your all code?  thanks
1 month ago
for example:

List -> {1,2,3,4}

Thread 1   iterating  in  data 3   , suddenly anther Thread 2 deleting the data 1.     when iterating the data 1 throw Exception, because no data 1.
1 month ago
you can create Observer class by yourself.
1 month ago
Please try change



to


1 month ago
1.FileInputStream  read file  content
2. modify content
3.FileOutputStream write content to file
1 month ago
example:


1 month ago
Use your space time studying and practicing new techniques by yourself.

All your destiny it up to you.   good luck
1 month ago