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常用Linux命令详解（持续更新） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...作，详细的命令参数请输入：shutdown -h 进行查看
shutdown now 关机命令
shutdown -r now 关机重启命令
3. 重新启动计算机的命令
reboot
用来重新启动系统，直接输入reboot即可
4. 新建用户的命令
useradd kedacom 新增一个kedacom...
Java Pass Method as Parameter
...
In Java 8, you can now pass a method more easily using Lambda Expressions and Method References. First, some background: a functional interface is an interface that has one and only one abstract method, although it can contain any number of def...
Reference: What is variable scope, which variables are accessible from where and what are “undefined
...rom. It then explicitly returns a value. The caller has the confidence to know what variables the function will work with and where its return values come from:
$baz = 'baz';
$blarg = foo($baz);
Extending the scope of variables into anonymous functions
$foo = 'bar';
$baz = function () use ($f...
What is an initialization block?
...e program, but if there are other things that can cause that, I'd like to know).
– Glen Pierce
Apr 20 '17 at 1:24
3
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When is an interface with a default method initialized?
...ialized by non constant value (method call), is not used anywhere.
It is known at compile time that constant field of interface is not used anywhere, and the interface is not containing any default method (In java-8) so there is no need to initialize or load the interface.
Interface will be initia...
Accessing dict keys like an attribute?
...usion about what's being done, since this isn't a commonly-used idiom. I know it would have the potential to confuse me.
Additonally, if you change the value of KEY as follows (but miss changing d.spam), you now get:
>>> KEY = 'foo'
>>> d[KEY] = 1
>>> # Several lines of...
Creating a singleton in Python
... http://googletesting.blogspot.com/2008/08/root-cause-of-singletons.html:
Now, there is one kind of Singleton which is OK. That is a singleton where all of the reachable objects are immutable. If all objects are immutable than Singleton has no global state, as everything is constant. But it is so e...
URL encoding the space character: + or %20?
...le the "+" character in the path fragment part can be left unencoded.
Now in the query part, spaces may be encoded to either "+" (for backwards compatibility: do not try to search for it in the URI standard) or "%20" while the "+" character (as a result of this ambiguity) has to be escaped to "...
What does LayoutInflater in Android do?
...dInstanceState);
setContentView(R.layout.activity_main);
}
}
Now let's inflate (create) another copy of our custom layout and add it in.
LayoutInflater inflater = getLayoutInflater();
View myLayout = inflater.inflate(R.layout.my_layout, mainLayout, false);
To inflate the new view ...
Constructor overload in TypeScript
...parameters that may not have all properties of the object defined. You can now safely write any of these:
const box1 = new Box();
const box2 = new Box({});
const box3 = new Box({x:0});
const box4 = new Box({x:0, height:10});
const box5 = new Box({x:0, y:87,width:4,height:0});
// Correctly reports...