大约有 46,000 项符合查询结果（耗时：0.0728秒） [XML]
Hide Utility Class Constructor : Utility classes should not have a public or default constructor
...
If this class is only a utility class, you should make the class final and define a private constructor:
public final class FilePathHelper {
private FilePathHelper() {
//not called
}
}
This prevents the default parameter-less constructor from being used elsewhere in your code. Ad...
What's the difference between the data structure Tree and Graph?
... speaking, what's the essential difference between the data structure Tree and Graph? And how about the tree based search and Graph based search?
...
Select all DIV text with single mouse click
...ted so the user doesn't need to manually highlight the text with the mouse and potentially miss a bit of the text?
12 Answe...
Modifying location.hash without page scrolling
We've got a few pages using ajax to load in content and there's a few occasions where we need to deep link into a page. Instead of having a link to "Users" and telling people to click "settings" it's helpful to be able to link people to user.aspx#settings
...
Create PostgreSQL ROLE (user) if it doesn't exist
...sword';
END IF;
END
$do$;
(Building on @a_horse_with_no_name's answer and improved with @Gregory's comment.)
Unlike, for instance, with CREATE TABLE there is no IF NOT EXISTS clause for CREATE ROLE (up to at least pg 12). And you cannot execute dynamic DDL statements in plain SQL.
Your reques...
Why seal a class?
...ealing a class? I cannot fathom how not allowing inheritance can be useful and most likely not the only one fighting these classes.
...
Git error on commit after merge - fatal: cannot do a partial commit during a merge
I ran a git pull that ended in a conflict. I resolved the conflict and everything is fine now (I used mergetool also).
1...
How to identify CAAnimation within the animationDidStop delegate?
...om operations when the animations stopped, but I only wanted one delegate handler for animationDidStop.
10 Answers
...
How to insert newline in string literal?
...line" + Environment.NewLine + "second line";
String interpolation (in C#6 and above):
string x = $"first line{Environment.NewLine}second line";
You could also use \n everywhere, and replace:
string x = "first line\nsecond line\nthird line".Replace("\n",
...
JPA getSingleResult() or null
... doesn't exist or update it if it does. To enable this, I have to findByIdAndForeignKey , if it returned null insert if not then update. The problem is how do I check if it exists? So I tried getSingleResult . But it throws an exception if the
...