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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...t.edu)
Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology
77 Massachusetts Avenue, Cambridge, MA 02139, USA
ABSTRACT
MIT App Inventor is a block-based event-driven programming tool that allows everyone, especially novices, to start programming and bu...
How to hide elements without having them take space on the page?
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Try setting display:none to hide and set display:block to show.
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How can I restart a Java application?
...n by -Djava.home.)
You would presumably want to honor the original memory settings etc (-Xmx, -Xms, …) so you need to figure out which settings where used to start the first JVM. You could try using ManagementFactory.getRuntimeMXBean().getInputArguments() but there's no guarantee that this will r...
Changing Jenkins build number
...le) and update the build number in Jenkins to match it. I have tried to set the build number:
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Create space at the beginning of a UITextField
...now:
Swift 4.2
class TextField: UITextField {
let padding = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
override open func textRect(forBounds bounds: CGRect) -> CGRect {
return bounds.inset(by: padding)
}
override open func placeholderRect(forBounds bounds: CGR...
Which characters need to be escaped when using Bash?
...1!s/^/"/; $!s/$/"/'.
2b. More readable version of 2
There's an easy safe set of characters, like [a-zA-Z0-9,._+:@%/-], which can be left unescaped to keep it more readable
I\'m\ a\ s@fe\ \$tring\ which\ ends\ in\ newline"
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sed command: LC_ALL=C sed -e 's/[^a-zA-Z0-9,._+@%/-]/\\&/g; 1{$s/^$...
Switch on Enum in Java [duplicate]
...a. I'm guessing you intended to say you can’t, but you can. chars have a set range of values, so it's easy to compare. Strings can be anything.
A switch statement is usually implemented as a jump table (branch table) in the underlying compilation, which is only possible with a finite set of value...
Tuples( or arrays ) as Dictionary keys in C#
...uples are not the most performant when they're meant to be used as keys in sets since its Equals and GetHashCode implementation causes boxing for value types.
I would go with tuple based dictionary, but if I want more performance, I would use my own tuple with better implementation.
On a side n...
smart pointers (boost) explained
What is the difference between the following set of pointers? When do you use each pointer in production code, if at all?
4...
How to return multiple values? [duplicate]
...values, then you can use Java's built-in container classes like Map, List, Set etc. Check the java.util package's JavaDoc for more details.
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