大约有 16,000 项符合查询结果（耗时：0.0418秒） [XML]
What is the difference between a weak reference and an unowned reference?
... reference whenever it is valid for that reference to become
nil at some point during its lifetime. Conversely, use an unowned
reference when you know that the reference will never be nil once it
has been set during initialization.
In the docs, there are some examples that discuss retain cycles and...
CSV API for Java [closed]
...
public class UserBean {
String username, password, street, town;
int zip;
public String getPassword() { return password; }
public String getStreet() { return street; }
public String getTown() { return town; }
public String getUsername() { return username; }
public int ...
Breadth First Vs Depth First
...hat there is some ambiguity in the traversal orders, and I've cheated to maintain the "reading" order at each level of the tree. In either case I could get to B before or after C, and likewise I could get to E before or after F. This may or may not matter, depends on you application...)
Both kind...
How to pass the values from one activity to previous activity
...as a subactivity by using startActivityForResult from your main Activity.
Intent i = new Intent(this,TextEntryActivity.class);
startActivityForResult(i, STATIC_INTEGER_VALUE);
Within the subactivity, rather than just closing the Activity when a user clicks the button, you need to create a new...
When should I use a composite index?
...s mentioned by Will, MySQL provides spatial extension support. A spatial point is stored in a single column instead of two separate lat lng columns. Spatial index can be applied to such a column. However, the efficiency could be overrated based on my personal experience. It could be that spatial ind...
Which is more efficient, a for-each loop, or an iterator?
...tor underwater.
If however, you mean by loop the old "c-style" loop:
for(int i=0; i<list.size(); i++) {
Object o = list.get(i);
}
Then the new for loop, or iterator, can be a lot more efficient, depending on the underlying data structure. The reason for this is that for some data structure...
Can I use break to exit multiple nested 'for' loops?
...grammers. The former are self explanatory. The latter, which you would fit into if you choose to use them well, use a so called "evil" concept when it is the lesser of (two) evils. Read this for a better understanding of some C++ concepts that you might need to use from time to time (macros, goto's,...
Java - No enclosing instance of type Foo is accessible
...to be meaningful. For example, if we had:
public class Hello {
public int enormous;
public Hello(int n) {
enormous = n;
}
public class Thing {
public int size;
public Thing(int m) {
if (m > enormous)
size = enormous;
...
Read/Write 'Extended' file properties (C#)
...bjFolder;
objFolder = shell.NameSpace(@"C:\temp\testprop");
for( int i = 0; i < short.MaxValue; i++ )
{
string header = objFolder.GetDetailsOf(null, i);
if (String.IsNullOrEmpty(header))
break;
arrHeaders.Add(header);
}
foreach(Shell32.Fo...
What is the difference between a “function” and a “procedure”?
...ramming languages. However, I just found out that I use these terms almost interchangeably (which is probably very wrong).
...