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Convert array of strings into a string in Java
...arr) {
builder.append(s);
}
String str = builder.toString();
(Java 8 and above):
String str = String.join(",", arr);
And if you're coming from the Android angle:
String str = TextUtils.join(",", arr);
You can modify the above depending on what characters, if any, you want in between stri...
Select last N rows from MySQL
...T 50
) sub
ORDER BY id ASC
This will select the last 50 rows from table, and then order them in ascending order.
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How to retrieve a user environment variable in CMake (Windows)
...Name="Hello World" cmake ..
env [--unset=NAME]... [NAME=VALUE]... COMMAND [ARG]...
Run command in a modified environment.
Just be aware that this may only work the first time. If CMake re-configures with one of the consecutive builds (you just call e.g. make, one CMakeLists.txt was cha...
Fragment lifecycle - which method is called upon show / hide?
...
Similar to activity lifecycle, Android calls onStart() when fragment becomes visible. onStop() is normally called when fragment becomes invisible, but it can also be called later in time.
Depending on your layout Android can call onStart() even, when your...
End of support for python 2.7?
...re, to 2020. This decision was made to
clarify the status of Python 2.7 and relieve worries for those users
who cannot yet migrate to Python 3. See also PEP 466.
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Why does int num = Integer.getInteger(“123”) throw NullPointerException?
... variation of this problem was featured in Return of the Puzzlers: Schlock and Awe (TS-5186), Josh Bloch and Neal Gafter's 2009 JavaOne Technical Session presentation. Here's the concluding slide:
The Moral
Strange and terrible methods lurk in libraries
Some have innocuous soundi...
What is the advantage of using abstract classes instead of traits?
... of object, it evolves or required when an object comes out from isolation and has to communicate.
– Ramiz Uddin
Oct 12 '15 at 11:05
5
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How to compare if two structs, slices or maps are equal?
I want to check if two structs, slices and maps are equal.
5 Answers
5
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System.currentTimeMillis() vs. new Date() vs. Calendar.getInstance().getTime()
In Java, what are the performance and resource implications of using
8 Answers
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Mocha / Chai expect.to.throw not catching thrown errors
...test keeps failing on the thrown error, but If I wrap the test case in try and catch and assert on the caught error, it works.
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