文章列表
Volatile关键字的作用
- 博客分类：
- Java
It is possible for each thread to have a local
stack and maintain copies of some variables there. If you define a variable as volatile, it tells
the compiler not to do any optimizations that would remove reads and writes that keep the
field in exact synchronization with the local data in the ...
Atomicity and volatility
- 博客分类：
- Java
Atomicity applies to "simple operations" on primitive types except for longs and doubles.
Reading and writing primitive variables other than long and double is guaranteed to go to
and from memory as indivisible (atomic) operations. However, the JVM is allowed to
perform reads and wr ...
When should you synchronize? Apply Brian’s Rule of Synchronization
If you are writing a variable that might next be read by another thread, or reading a
variable that might have last been written by another thread, you must use
synchronization, and further, both the reader and the writer must s ...
All objects automatically contain a single lock (also referred to as a monitor). When you call
any synchronized method, that object is locked and no other synchronized method of
that object can be called until the first one finishes and releases the lock. For the preceding
methods, if f( ) is ...
var FloatCalFun=new Object();
//获取参数精度，如果为整数则精度为0
FloatCalFun._getPrecision=function(arg){
if(arg.toString().indexOf(".")==-1){
return 0;
}else{
return arg.toString().split(".")[1].length;
}
}
//获取小数的整数形式
FloatCalFun._getIntFromFloat=function(arg){
i ...
将win7电脑变身WiFi热点，让手机、笔记本共享上网
用win7建立无线局域网，可以共享上网可以局域网游戏。开启windows 7的隐藏功能：虚拟WiFi和SoftAP（即虚拟无线AP），就可以让电脑变成无线路由器，实现共享上网，节省网费和路 ...
注明：该方法只限在jquery中的ajax请求，作者只在jquery中做过测试。
public boolean isAjaxRequest(HttpServletRequest request){
String requestHeader=request.getHeader(
One very straightforward way to implement concurrency is at the operating system level, using processes. A process is a self-contained program running within its own address space. A multitasking operating system can run more than one process (program) at a time by periodically switching the CPU fr ...