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Java's final vs. C++'s const
...on const instances. Java does not have an equivalent to this. E.g.:
class Foo {
public:
void bar();
void foo() const;
};
void test(const Foo& i) {
i.foo(); //fine
i.bar(); //error
}
Values can be assigned, once, later in Java only e.g.:
public class Foo {
void bar() {
...
How do I get a class instance of generic type T?
I have a generics class, Foo<T> . In a method of Foo , I want to get the class instance of type T , but I just can't call T.class .
...
A semantics for Bash scripts?
...as dynamic scope unless you explicitly declare names within a function.
$ foo() { echo $x; }
$ bar() { local x; echo $x; }
$ foo
$ bar
$ x=123
$ foo
123
$ bar
$ …
Environment and process "scope"
Subshells inherit the variables of their parent shells, but other kinds of processes don't inher...
micro:bit 微控制器教程 · App Inventor 2 中文网
...先扫描附近的蓝牙设备，并把扫描到的设备放到 SelectBLE 这个 ListPicker 里面。断线时直接调用 BluetoothLE.Disconnect 指令。
步骤2：设备选择
在 ListPicker 中选择您的 micro:bit（名字很特殊不会选错）
步骤3...
Throwing exceptions from constructors
...ch that exception in a constructor initializer list.
e.g.
func::func() : foo()
{
try {...}
catch (...) // will NOT catch exceptions thrown from foo constructor
{ ... }
}
vs.
func::func()
try : foo() {...}
catch (...) // will catch exceptions thrown from foo constructor
{...
Parse JSON String into a Particular Object Prototype in JavaScript
...ne of the standardized functions to set the prototype:
Object.assign(new Foo, { a: 1 })
Object.setPrototypeOf({ a: 1 }, Foo.prototype)
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Difference between using bean id and name in Spring configuration file
...fy exactly one id. Conventionally these names are alphanumeric ('myBean', 'fooService', etc), but may special characters as well. If you want to introduce other aliases to the bean, you can also specify them in the name attribute, separated by a comma (,), semicolon (;), or white space. As a histori...
Scala constructor overload?
...at the primary constructor is the sole point of entry to the class.
class Foo(x: Int, y: Int, z: String) {
// default y parameter to 0
def this(x: Int, z: String) = this(x, 0, z)
// default x & y parameters to 0
// calls previous auxiliary constructor which calls the primary cons...
Is using 'var' to declare variables optional? [duplicate]
... it's like you're talking about a variable that you have used before.
var foo = 'first time use';
foo = 'second time use';
With regards to scope, it is not true that variables automatically become global. Rather, Javascript will traverse up the scope chain to see if you have used the variable bef...
Why would a static nested interface be used in Java?
...ce code.
Either way, the developer is simply declaring an interface named Foo.Bar. There is no further association with the enclosing class, except that code which cannot access Foo will not be able to access Foo.Bar either. (From source code - bytecode or reflection can access Foo.Bar even if Foo ...