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How can I check whether an array is null / empty?
...mpty" here has no official meaning. I'm choosing to define empty as having 0 elements:
arr = new int[0];
if (arr.length == 0) {
System.out.println("array is empty");
}
An alternative definition of "empty" is if all the elements are null:
Object arr[] = new Object[10];
boolean empty = true;
for...
Can I keep Nuget on the jQuery 1.9.x/1.x path (instead of upgrading to 2.x)?
...e config change, an update should not upgrade your jQuery package to the 2.0 release. There have been issues in the past with the UI package manager not respecting the allowedVersions attribute (https://nuget.codeplex.com/workitem/1891), so you may have to use the command line if you encounter this ...
How does Hadoop process records split across block boundaries?
...
+50
Interesting question, I spent some time looking at the code for the details and here are my thoughts. The splits are handled by the cl...
How are strings passed in .NET?
...
+50
A reference is passed; however, it's not technically passed by reference. This is a subtle, but very important distinction. Consider t...
How do I analyze a program's core dump file with GDB when it has command-line parameters?
...ows crash scenario
Program terminated with signal 11, Segmentation fault.
#0 __strlen_ia32 () at ../sysdeps/i386/i686/multiarch/../../i586/strlen.S:99
99 ../sysdeps/i386/i686/multiarch/../../i586/strlen.S: No such file or directory.
in ../sysdeps/i386/i686/multiarch/../../i586/strlen.S
(gdb)...
What's the difference between IEquatable and just overriding Object.Equals()?
...
The main reason is performance. When generics were introduced in .NET 2.0 they were able to add a bunch of neat classes such as List<T>, Dictionary<K,V>, HashSet<T>, etc. These structures make heavy use of GetHashCode and Equals. But for value types this required boxing. IEquata...
ios Upload Image and Text using HTTP POST
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Difference between $(this) and event.target?
...
305
There is a difference between $(this) and event.target, and quite a significant one. While this...
What is the difference between a static and a non-static initialization code block
...
405
The code block with the static modifier signifies a class initializer; without the static modif...
多媒体组件 · App Inventor 2 中文网
...形状
设置文件选择器的形状，此属性的有效值为：
0（默认）
1 （圆形）
2（矩形）
3（椭圆形）。
如果设置了图像，则形状将不可见。
显示反馈
设置文件选择器指定 图像后被按压是否显示视觉反馈。...