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Declaring variables inside a switch statement [duplicate]

...d this limitation. You can enclose the contents of a case in { } braces to introduce a scoping block, or you can move the variable declaration outside the switch. Which you choose is a matter of personal preference. Just be aware that a variable declared in { } braces is only valid within that scope...
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Difference between static memory allocation and dynamic memory allocation

... a function are only there until the function finishes. void func() { int i; /* `i` only exists during `func` */ } Dynamic memory allocation is a bit different. You now control the exact size and the lifetime of these memory locations. If you don't free it, you'll run into memory leaks, which...
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How to compare objects by multiple fields

...stName) .thenComparing(p->p.lastName) .thenComparingInt(p->p.age); If you have accessor methods: Comparator.comparing(Person::getFirstName) .thenComparing(Person::getLastName) .thenComparingInt(Person::getAge); If a class implements Comparable then ...
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Is a colon `:` safe for friendly-URL use?

...".", "-", "*", and "_" remain the same. The space character " " is converted into a plus sign "+". All other characters are unsafe and are first converted into one or more bytes using some encoding scheme. Then each byte is represented by the 3-character string "%xy", where xy ...
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Gridview with two columns and auto resized images

... Here's a relatively easy method to do this. Throw a GridView into your layout, setting the stretch mode to stretch the column widths, set the spacing to 0 (or whatever you want), and set the number of columns to 2: res/layout/main.xml <?xml version="1.0" encoding="utf-8"?> <...
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How to clone an InputStream?

...same information more than once, and the input data is small enough to fit into memory, you can copy the data from your InputStream to a ByteArrayOutputStream. Then you can obtain the associated array of bytes and open as many "cloned" ByteArrayInputStreams as you like. ByteArrayOutputStream baos ...
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Is it expensive to use try-catch blocks even if an exception is never thrown?

...eptions are thrown asynchronously, they are not async but thrown in safe points. and this part try has some minor costs associated with it. Java cannot do some optimizations on code in a try block that it would otherwise do does need a serious reference. At some point the code is very likely to be w...
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ruby 1.9: invalid byte sequence in UTF-8

...-op, and no checks are run. Ruby Core Documentation for encode. However, converting it to UTF-16 first forces all the checks for invalid byte sequences to be run, and replacements are done as needed. – Jo Hund Aug 11 '13 at 18:32 ...
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Using generic std::function objects with member functions in one class

For one class I want to store some function pointers to member functions of the same class in one map storing std::function objects. But I fail right at the beginning with this code: ...
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What do all of Scala's symbolic operators mean?

... I divide the operators, for the purpose of teaching, into four categories: Keywords/reserved symbols Automatically imported methods Common methods Syntactic sugars/composition It is fortunate, then, that most categories are represented in the question: -> // Automati...