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What is a NullPointerException, and how do I fix it?
...null;
int length = foo.length(); // HERE
}
}
the statement labeled "HERE" is going to attempt to run the length() method on a null reference, and this will throw a NullPointerException.
There are many ways that you could use a null value that will result in a NullPointerException. I...
NSIS学习笔记（持续更新） - C/C++ - 清泛网 - 专注C/C++及内核技术
...BUTTON3|MB_TOPMOST "${PRODUCT_NAME}" "" \
'检测到程序正在运行，是否立即终止程序？$\n$\n\
【终止】终止程序，继续卸载$\n\
【取消】取消卸载' \
"终止" "取消"
Pop $0
${If} $0 == 1
KillProcDLL::KillProc "Test.exe"
${Elseif} $0 == 2
Abort
${E...
What does the “===” operator do in Ruby? [duplicate]
...cally, it's a boolean operator which asks the question "If I have a drawer labelled a would it make sense to put b in that drawer?"
An alternative formulation is "If a described a set, would b be a member of that set?"
For example:
(1..5) === 3 # => true
(1..5) === 6 # =&...
Controlling fps with requestAnimationFrame?
...ime = null;
frame = -1;
}
};
}
body {font:16px sans-serif}
<label>Framerate: <select id=sFPS>
<option>12</option>
<option>15</option>
<option>24</option>
<option>25</option>
<option>29.97</option>
<opt...
YAML current date in rmarkdown
... Markdown Parameterized Reports
params:
reportDate:
input: date
label: 'Report Date:'
value: as.POSIXct(Sys.Date())
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开源MQTT网关：EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区，为创新赋能！
...物联网等各类关键业务场景。EMQX 采用 Erlang/OTP 编写，这是一种用于构建大规模可扩展软实时系统的编程语言。与 Mosquitto 不同，EMQX 在设计之初即采用了分布式集群架构，可以轻松实现弹性水平扩展，从而稳定承载大规模的 MQTT ...
Java using enum with switch statement
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The enums should not be qualified within the case label like what you have NDroid.guideView.GUIDE_VIEW_SEVEN_DAY, instead you should remove the qualification and use GUIDE_VIEW_SEVEN_DAY
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Get DateTime.Now with milliseconds precision
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start = DateTime.Now;
//Do something here
time = DateTime.Now - start;
label1.Text = String.Format("{0}.{1}", time.Seconds, time.Milliseconds.ToString().PadLeft(3, '0'));
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Which is a better way to check if an array has more than one element?
...h this answer is a reply to. The context is different, and I apologize for labelling the answer as wrong. It's not wrong, if you look at the original question. It's bad for the edited question.
– N.B.
Apr 5 '12 at 9:01
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How do I skip an iteration of a `foreach` loop?
...'s goto is actually useful for the situation @Brian is asking about. Add a label such as nextArray: at the bottom of the outer loop, and then goto nextArray; when you want to skip to it.
– Jacob Krall
Oct 14 '16 at 17:21
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