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How to test if one java class extends another at runtime?
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Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ell自身（如Windows Explorer扩展开发）。
环境
shell编程跟java、php编程一样，只要有一个能编写代码的文本编辑器和一个能解释执行的脚本解释器就可以了。
OS
当前主流的操作系统都支持shell编程，本文档所述的shell编程是指Linu...
How to build jars from IntelliJ properly?
...
You have to change manifest directory:
<project folder>\src\main\java
replace "java" with "resources"
<project folder>\src\main\resources
This is how it should look like:
Then you choose the dependencies what you want to be packed IN your jar, or NEAR your jar file
To build...
How can I count the number of matches for a regex?
...tcher.find() does not find all matches, only the next match.
Solution for Java 9+
long matches = matcher.results().count();
Solution for Java 8 and older
You'll have to do the following. (Starting from Java 9, there is a nicer solution)
int count = 0;
while (matcher.find())
count++;
Btw,...
How to get a reversed list view on a list in Java?
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java.util.Deque has descendingIterator() - if your List is a Deque, you can use that.
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Singleton with Arguments in Java
...how I'd probably do it when coding. In C#, I'd just use properties though. Java, probably like this.
– Zack
Jun 26 '09 at 20:33
132
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Data structure: insert, remove, contains, get random element, all at O(1)
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@aamadmi - well, in Java I guess it should. In pseudo-code, contains should work just fine :)
– r0u1i
Apr 23 '14 at 13:22
4
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Constructor overloading in Java - best practice
... the least to the most arguments in the constructor call. Is this standard Java style? Why?: In my opinion it would make sense to do it the opposite way that way you the first constructor definition you should see is the one that has all the details.
– Josie Thompson
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No Exception while type casting with a null in java
... equal to "null"
I wondered where that is specified and looked it up the Java Specification:
The null reference can always be assigned or cast to any reference type (§5.2, §5.3, §5.5).
If the reference is null, it is converted to the string "null" (four ASCII characters n, u, l, l).
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java.lang.ClassNotFoundException: Didn't find class on path: dexpathlist
...s my solution:
Right click on your project and select Properties.
Select Java Build Path from the menu on the left.
Select the Order and Export tab.
From the list make sure the libraries or external jars you added to your project are checked.
Finally, clean your project & run.
You may also c...