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Linux how to copy but not overwrite? [closed]
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@galenandrew cp -n does not exit with error if the file exists on Ubuntu 12.04.
– amit
Aug 29 '16 at 9:47
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How to check if AlarmManager already has an alarm set?
...CREATE which as described in the javadoc: if the described PendingIntent **does not** already exists, then simply return null (instead of creating a new one)
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How to add a line break in an Android TextView?
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Just \n alone will work... Don't think the \r does anything.
– Peter Ajtai
Nov 17 '11 at 23:55
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Python __str__ versus __unicode__
...n classes override __unicode__() more frequently than __str__() but it doesn't appear to be consistent. Are there specific rules when it is better to implement one versus the other? Is it necessary/good practice to implement both?
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Difference between String#equals and String#contentEquals methods
...ng#contentEquals() only compares the contents (the character sequence) and does not check if the other object is also an instance of String. It can be anything as long as it is an implementation of CharSequence which covers a.o. String, StringBuilder, StringBuffer, CharBuffer, etc.
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How to force a Solution file (SLN) to be opened in Visual Studio 2013?
...mmon7\IDE\devenv.exe" "D:\Source\MySolution.sln" /upgrade
Note that this does not open Visual Studio. An alternative is to, from within the IDE, select "Save As" for your solution file and overwrite or save the solution under new name.
Read more:
http://msdn.microsoft.com/en-us/library/w15a82ay.a...
Why does Java switch on contiguous ints appear to run faster with added cases?
...s job and compiles the bytecode into assembly, the tableswitch instruction does not always result in an array of pointers: sometimes the switch table is transformed into what looks like a lookupswitch (similar to an if/else if structure).
Decompiling the assembly generated by the JIT (hotspot JDK 1...
Syntax for a single-line Bash infinite while loop
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Well this does more than just changing the syntax - it will execute the command after the sleep. In the previous answer, the command is executed right away. Just something to note.
– DanGordon
Oct...
How to remove leading zeros from alphanumeric text?
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This does not work in Kotlin, you need to be explicit about the Regex .replaceFirst("^0+(?!$)".toRegex(), "")
– mkabatek
Sep 28 '18 at 21:27
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Uses for Optional
... provides a default for the second:
foo("bar", "baz");
foo("bar");
This does have limitations, but it's much nicer than either of the above.
Use cases #3 and #4, having an Optional in a class field or in a data structure, is considered a misuse of the API. First, it goes against the main design ...