大约有 40,700 项符合查询结果（耗时：0.0408秒） [XML]
Retain precision with double in Java
...ave an exact representation of 11.4.
Now, a little explanation into why this is happening:
The float and double primitive types in Java are floating point numbers, where the number is stored as a binary representation of a fraction and a exponent.
More specifically, a double-precision floating po...
What is the correct way to create a single-instance WPF application?
Using C# and WPF under .NET (rather than Windows Forms or console), what is the correct way to create an application that can only be run as a single instance?
...
Regular expression for floating point numbers
...
TL;DR
Use [.] instead of \. and [0-9] instead of \d to avoid escaping issues in some languages (like Java).
Thanks to the nameless one for originally recognizing this.
One relatively simple pattern for matching a floating point number is
[+-]?([0-9]*[.])?[0-9]+
This will match:
123
123....
Scalar vs. primitive data type - are they the same thing?
...e interchangeable. They are frequently similar, but the difference does exist, and seems to mainly be in what they are contrasted with and what is relevant in context.
Scalars are typically contrasted with compounds, such as arrays, maps, sets, structs, etc. A scalar is a "single" value - integer...
Catching java.lang.OutOfMemoryError?
...
I agree and disagree with most the responses here.
There are a number of scenarios where you may wish to catch an OutOfMemoryError and in my experience (on Windows and Solaris JVMs), only very infrequently is OutOfMemoryError the death-k...
Java exception not caught?
...If the catch block completes abruptly for reason R, then the finally block is executed. Then there is a choice:
If the finally block completes normally, then the try statement completes abruptly for reason R.
If the finally block completes abruptly for reason S, then the try statement completes ab...
what is the difference between ?:, ?! and ?= in regex?
...e expressions but couldn't understand the exact difference between them.
This is what they say:
6 Answers
...
Android splash screen image sizes to fit all devices
I have a full screen PNG I want to display on splash. Only one error there, and I have no idea
what size to put in every drawable folder ( ldpi , mdpi , hdpi , and xhdpi ). My application is supposed to run good and beautiful on all phones and tablets. What sizes (in pixels) should I create so th...
What are the Dangers of Method Swizzling in Objective-C?
I have heard people state that method swizzling is a dangerous practice. Even the name swizzling suggests that it is a bit of a cheat.
...
Return value in a Bash function
...though bash has a return statement, the only thing you can specify with it is the function's own exit status (a value between 0 and 255, 0 meaning "success"). So return is not what you want.
You might want to convert your return statement to an echo statement - that way your function output could be...