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What does the Java assert keyword do, and when should it be used?
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Assertions (by way of the assert keyword) were added in Java 1.4. They are used to verify the correctness of an invariant in the code. They should never be triggered in production code, and are indicative of a bug or misuse of a code path. They can be activated at run-time by w...
Is it better to reuse a StringBuilder in a loop?
...antiation was the bottleneck, comment it.
Three runs with this answer:
$ java ScratchPad
1567
$ java ScratchPad
1569
$ java ScratchPad
1570
Three runs with the other answer:
$ java ScratchPad2
1663
2231
$ java ScratchPad2
1656
2233
$ java ScratchPad2
1658
2242
Although not significant, settin...
【精心整理】【实用】visual C++中最常用的类与API函数 - C/C++ - 清泛网 -...
...色画笔； WHITE_PEN 白色画笔；
NULL_PEN 空画笔；
SYSTEM_FONT 系统字体；
返回值：被替换的CGdiObject对象的指针，若调用失败，返回NULL
CDC::SetBkColor 设置当前背景色
virtual COLORREF SetBkColor(COLORREF crColor);
参数：crColor为新背景色
返...
equals vs Arrays.equals in Java
When comparing arrays in Java, are there any differences between the following 2 statements?
8 Answers
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How to know if other threads have finished?
...eption when it completes, or
Use locks or synchronizers or mechanisms from java.util.concurrent, or
More orthodox, create a listener in your main Thread, and then program each of your Threads to tell the listener that they have completed.
How to implement Idea #5? Well, one way is to first create...
Why seal a class?
...e type which is subclassed may become mutable (ick)
Item 17 of Effective Java goes into more details on this - regardless of the fact that it's written in the context of Java, the advice applies to .NET as well.
Personally I wish classes were sealed by default in .NET.
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How to calculate “time ago” in Java?
...licated logic and just delete the last delimiter when you're done.
import java.util.concurrent.TimeUnit;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
public class TimeUtils {
/**
* Converts time to a human readable format within the specified range
*
* @param durat...
How does the new automatic reference counting mechanism work?
...ce counting system in Objective-C. It might be difficult to apply this to Java or other languages, but I don't know enough about the low-level compiler details to make a definitive statement there. Given that Apple is the one pushing this effort in LLVM, Objective-C will come first unless another ...
Download attachments using Java Mail
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Some time saver for the code where you save the attachment file :
with javax mail version 1.4 and after , you can say
// SECURITY LEAK - do not do this! Do not trust the 'getFileName' input. Imagine it is: "../etc/passwd", for example.
// bodyPart.saveFile("/tmp/" + bodyPart.getFileName());
i...
Why is “int i = 2147483647 + 1;” OK, but “byte b = 127 + 1;” is not compilable?
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Actually, today I read some of Java puzzlers , including a puzzle just about that... See here: javapuzzlers.com/java-puzzlers-sampler.pdf - puzzle 3
– MByD
Jul 31 '11 at 13:47
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