大约有 45,000 项符合查询结果（耗时：0.0772秒） [XML]
Nullable ToString()
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If that was the mentality, you'd expect .HasValue to still throw that exception.
– Extragorey
Apr 18 '18 at 0:13
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Exception 'open failed: EACCES (Permission denied)' on Android
..... The <uses-permission was in the wrong place. This is right:
<manifest>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
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<application>
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<activity>
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</ac...
How to override trait function and call it from the overridden function?
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just to clarify - once your class defines the same method, it automatically overrides the trait's. The trait fills in the method as @ircmaxell mentions when it's empty.
– Yehosef
Jun 8 '14 at 12:43...
How to only find files in a given directory, and ignore subdirectories using bash
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If you just want to limit the find to the first level you can do:
find /dev -maxdepth 1 -name 'abc-*'
... or if you particularly want to exclude the .udev directory, you can do:
find /dev -name '.udev' -prune -o -name '...
How to update a value, given a key in a hashmap?
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Java 8 way:
You can use computeIfPresent method and supply it a mapping function, which will be called to compute a new value based on existing one.
For example,
Map<String, Integer> words = new HashMap<>();
words.put("hello", 3);
words.put("...
How to set up a cron job to run an executable every hour?
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You're right. && is much better if there is a chance the cd target doesn't exist (for example if the diretory is on an NFS server that happens to be down).
– joast
Aug 13 '10 at 16:36
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Grouping functions (tapply, by, aggregate) and the *apply family
... ?apply). There are enough of them, though, that beginning useRs may have difficulty deciding which one is appropriate for their situation or even remembering them all. They may have a general sense that "I should be using an *apply function here", but it can be tough to keep them all straight at fi...
What is the shortest way to pretty print a org.w3c.dom.Document to stdout?
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But if your XML contains astral characters, and you are using Xalan, note issues.apache.org/jira/browse/XALANJ-2419 and see also stackoverflow.com/a/11987283/1031689
– JasonPlutext
Aug 24 '1...
Looking for a 'cmake clean' command to clear up CMake output
...ke clean.
I usually build the project in a single folder like "build". So if I want to make clean, I can just rm -rf build.
The "build" folder in the same directory as the root "CMakeLists.txt" is usually a good choice. To build your project, you simply give cmake the location of the CMakeLists.tx...
what's the difference between “hadoop fs” shell commands and “hdfs dfs” shell commands?
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Following are the three commands which appears same but have minute differences
hadoop fs {args}
hadoop dfs {args}
hdfs dfs {args}
hadoop fs <args>
FS relates to a generic file system which can point to any file systems like local, HDFS etc. So this can be used when you are d...