大约有 16,000 项符合查询结果（耗时：0.0292秒） [XML]
Do you use NULL or 0 (zero) for pointers in C++?
...e NULL as it was defined as (void*)0 . You could not assign NULL to any pointer other than void* , which made it kind of useless. Back in those days, it was accepted that you used 0 (zero) for null pointers.
...
Why no generics in Go?
... does Go not have generic types?
Generics may well be added at some point. We don't feel an urgency for them, although we understand some programmers do.
Generics are convenient but they come at a cost in complexity in the type system and run-time. We haven't yet found a design that gives ...
Are Java static calls more or less expensive than non-static calls?
... benchmarking code has an additional constant overhead of incrementing one integer variable, checking a boolean variable, and looping if not true.
I suppose the results will vary from CPU to CPU, and from JVM to JVM, so give it a try and see what you get:
import java.io.*;
class StaticVsInstanceB...
Using Enums while parsing JSON with GSON
...on(new FileReader("input.json"), TruncateElement.class);
System.out.println(element.lower);
System.out.println(element.upper);
System.out.println(element.delimiter);
System.out.println(element.scope.get(0));
}
}
class AttributeScopeDeserializer implements JsonDeserializer<Attr...
Can inner classes access private variables?
...rivate:
static const char* const MYCONST;
Inner i;
int var;
};
const char* const Outer::MYCONST = "myconst";
int main()
{
Outer o1;
Outer o2(o1);
o1.func();
o2.func();
}
...
Are arrays passed by value or passed by reference in Java? [duplicate]
...reference will affect the original array..
But changing the reference to point to a new array will not change the existing reference in original method..
See this post..
Is Java "pass-by-reference" or "pass-by-value"?
See this working example: -
public static void changeContent(int[] arr) {
...
Easiest way to flip a boolean value?
... {
val = !val;
}
}
class KeyFactory {
public KeyObj getKeyObj(int param) {
switch(param) {
case VK_F11:
return new VK_F11();
case VK_F12:
return new VK_F12();
}
throw new KeyNotFoundException("Key " + param + " was not found!")...
How to get a list of installed android applications and pick one to run
...he code to get the list of activities/applications installed on Android :
Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
List<ResolveInfo> pkgAppsList = context.getPackageManager().queryIntentActivities( mainIntent, 0);
You will g...
Swift how to sort array of custom objects by property value
...mStringConvertible, Comparable {
let fileName: String
let fileID: Int
var description: String { return "ImageFile with ID: \(fileID)" }
init(fileName: String, fileID: Int) {
self.fileName = fileName
self.fileID = fileID
}
static func ==(lhs: ImageFile, rhs:...
What happens when there's insufficient memory to throw an OutOfMemoryError?
...ate static void test (OutOfMemoryError o) {
try {
for (int n = 1; true; n += n) {
int[] foo = new int[n];
}
} catch (OutOfMemoryError e) {
if (e == o)
System.out.println("Got the same OutOfMemoryError twice: " + e);
...