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译文：理解Java中的弱引用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...是一个很有用途的特性，况且这个特性已经在7年前 Java 1.2发布时便引入了。
好吧，这里我不期待你看完本文之后成为一个弱引用方面的专家，但是我认为至少你应该了解什么是弱引用，如何使用它们，并且什么场景使用。既然...
C++ semantics of `static const` vs `const`
...kes internal linkage the default, and all global variables have static lifetime. But the first variant has the same behavior in C, so that may be a good reason to use it.
Within a function, the second version can be computed from parameters. In C or C++ it doesn't have to be a compile-time constan...
How can we print line numbers to the log in java
...number as part of its output pattern. See http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/PatternLayout.html for details on how to do this (the key element in the conversion pattern is "L"). However, the Javadoc does include the following:
WARNING Generating caller location
info...
How to fix Array indexOf() in JavaScript for Internet Explorer browsers
...
Alternatively, you could use the jQuery 1.2 inArray function, which should work across browsers:
jQuery.inArray( value, array [, fromIndex ] )
share
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improve th...
How to assign colors to categorical variables in ggplot2 that have stable mapping?
...locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C ...
How can I find the length of a number?
...t work with large number or small number that has more than 20 digits. eg. 1.2e+22 toString().length outputs 7
– CherylG
Oct 18 '16 at 0:52
...
What does java:comp/env/ do?
I just spent too much time of my day trying to figure out some errors when hooking up some JNDI factory bean. The problem turned out to be that instead of this...
...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...nix-Syslog-1.1.tar.gz
perl-GD-2.35-1.el5.rf.i386.rpm
rrdtool-1.2.23
Time-HiRes-1.9725.tar.gz
File-Tail-0.99.3.tar.gz
一、环境配置
1、安装一下过程中所依赖的一些rpm包
yum install -y tcl-devel libart_lgpl-devel libtool-ltdl-devel
2、关闭sendmail，并取...
How to check if a file exists in the Documents directory in Swift?
...
Check the below code:
Swift 1.2
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
let getImagePath = paths.stringByAppendingPathComponent("SavedFile.jpg")
let checkValidation = NSFileManager.defau...
How can I initialize base class member variables in derived class constructor?
...lt;d<<endl;
}
};
int main(){
Base * b = new Derived(10, 1.2, 3.89);
b->Show();
return 0;
}
It's a working example in case you want to initialize the Base class data members present in the Derived class object, whereas you want to push these values interfacing via Deri...