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Difference between “@id/” and “@+id/” in Android

...efined/created in your project, you use @id/.. More Info As per your clarifications in the chat, you said you have a problem like this : If we use android:id="@id/layout_item_id" it doesn't work. Instead @+id/ works so what's the difference here? And that was my original question. Well, it...
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Placing Unicode character in CSS content value [duplicate]

.../serve the CSS file as UTF-8? nav a:hover:after { content: "↓"; } If that's not good enough, and you want to keep it all-ASCII: nav a:hover:after { content: "\2193"; } The general format for a Unicode character inside a string is \000000 to \FFFFFF – a backslash followed by six hex...
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C++ Singleton design pattern

...pattern for C++. It has looked like this (I have adopted it from the real life example): 22 Answers ...
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Are static fields open for garbage collection?

...ading of Classes and Interfaces A class or interface may be unloaded if and only if its defining class loader may be reclaimed by the garbage collector [...] Classes and interfaces loaded by the bootstrap loader may not be unloaded. ...
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How to select first and last TD in a row?

... and what if you want to select the second og third child? – clarkk Aug 29 '11 at 10:22 2 ...
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What is q=0.5 in Accept* HTTP headers?

... This is called a relative quality factor. It specifies what language the user would prefer, on a scale of 0 to 1, as can be seen from the HTTP/1.1 Specification, §14.4: Each language-range MAY be given an associated quality value which represents an estimate of the user's...
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Vim and Ctags tips and tricks [closed]

...ilarly, after splitting the window with Ctrl-w C-] you can do C-w T (aka Shift-t) to change that split into a new tab. – dash-tom-bang Sep 29 '10 at 17:25 1 ...
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What is a “cache-friendly” code?

What is the difference between " cache unfriendly code " and the " cache friendly " code? 9 Answers ...
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What are the default access modifiers in C#?

What is the default access modifier for classes, methods, members, constructors, delegates and interfaces? 9 Answers ...
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How to make input type= file Should accept only pdf and xls

... if you list all files on selection box. you can still uploading any file. – rüff0 Jan 5 '19 at 15:35 ...