大约有 47,000 项符合查询结果（耗时：0.0843秒） [XML]
Bash conditionals: how to “and” expressions? (if [ ! -z $VAR && -e $VAR ])
... -e $VAR ] , but it turns out that was also evaluating as true on an empty string; which I do not want.
5 Answers
...
Django Forms: if not valid, show form with error message
...ee. I return the same form that I got in. The error messages have automatically been added to it by the is_valid() function.
– user984003
Feb 1 '13 at 13:57
...
HashSet vs LinkedHashSet
...n item
LinkedHashSet maintain the order of insertion item
Example
Set<String> set = ...;// using new HashSet<>() OR new LinkedHashSet<>()
set.add("2");
set.add("1");
set.add("ab");
for(String value : set){
System.out.println(value);
}
HashSet output
1
ab
2
LinkedHashSet...
@property retain, assign, copy, nonatomic in Objective-C
...xample:
.h
@interface XYZClass : NSObject
@property (nonatomic, retain) NSString *name;
@end
.m
@implementation XYZClass
@synthesize name;
@end
Now the compiler will synthesize accessor methods for name.
XYZClass *obj=[[XYZClass alloc]init];
NSString *name1=[obj name]; // get 'name'
[obj setN...
Convert String to Uri
How can I convert a String to a Uri in Java (Android)? i.e.:
6 Answers
6
...
Get DateTime.Now with milliseconds precision
... etc.
If your question is actually just around converting a DateTime to a string with millisecond precision, I'd suggest using:
string timestamp = DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss.fff",
CultureInfo.InvariantCulture);
(Note that unlike your...
Fetch first element which matches criteria
... */)
.findFirst()
.get();
An example:
public static void main(String[] args) {
class Stop {
private final String stationName;
private final int passengerCount;
Stop(final String stationName, final int passengerCount) {
this.stationName = st...
What is the use of printStackTrace() method in Java?
...
This is normal, with the 1st one you call the toString() of the error, and in the 2nd you ask to print all the stackTrace from the error. That's 2 différents things.
– Jon
May 17 '16 at 8:08
...
How to get package name from anywhere?
...he main activity's onCreate() method:
Global to the class:
public static String PACKAGE_NAME;
Then..
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
PACKAGE_NAME = getApplicationContext().getPackageName(...
How can I implement prepend and append with regular JavaScript?
...
If you want to insert a raw HTML string no matter how complex, you can use:
insertAdjacentHTML, with appropriate first argument:
'beforebegin'
Before the element itself.
'afterbegin'
Just inside the element, before its first child.
'beforeend...