大约有 40,000 项符合查询结果（耗时：0.0455秒） [XML]
Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]
... @sscirrus: Sorry, my mistake. I've edited my answer accordingly. Try the new answer.
– Andrew Grimm
Jun 3 '11 at 9:15
14
...
How to pass macro definition from “make” command line arguments (-D) to C source code?
...makefile" using the option :
-Dname=value. The definition is accessible inside the makefile.
6 Answers
...
Get a specific bit from byte
... GetBit(this byte b, int bitNumber)
{
System.Collections.BitArray ba = new BitArray(new byte[]{b});
return ba.Get(bitNumber);
}
share
|
improve this answer
|
follow
...
How can I check a C# variable is an empty string “” or null? [duplicate]
...ring.IsNullOrEmpty(string value);
Additionally, since .NET 4.0 there's a new method that goes a bit farther:
// Indicates whether a specified string is null, empty, or consists only of white-space characters.
string.IsNullOrWhiteSpace(string value);
...
Determine if code is running as part of a unit test
...you shouldn't expect more general answers to work. You might want to ask a new question with all of your specific requirements. (What's the difference between "your code calling from a console application" and "a test runner" for example? How would you want to distinguish between your console applic...
Jackson with JSON: Unrecognized field, not marked as ignorable
...this worked for me:
private static final ObjectMapper objectMapper =
new ObjectMapper()
.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
and with setting:
@JsonIgnoreProperties(ignoreUnknown = true)
...
Android - Start service on boot
...oid onReceive(Context context, Intent arg1)
{
Intent intent = new Intent(context,service.class);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(intent);
} else {
context.startService(intent);
}
...
How to calculate “time ago” in Java?
... simple to use:
import org.ocpsoft.prettytime.PrettyTime;
PrettyTime p = new PrettyTime();
System.out.println(p.format(new Date()));
// prints "moments ago"
You can also pass in a locale for internationalized messages:
PrettyTime p = new PrettyTime(new Locale("fr"));
System.out.println(p.format...
Avoiding instanceof in Java
...ow visitor helps here. The point is that the response of OpinionatedElf to NewMonster shouldn't be encoded in NewMonster, but in OpinionatedElf.
– DJClayworth
Jun 7 '11 at 18:22
2
...
@UniqueConstraint and @Column(unique = true) in hibernate annotation
...g Hibernate's initialization:
metadataBuilder.applyImplicitNamingStrategy(new MyImplicitNamingStrategy());
It works for @UniqueConstraint, but not for @Column(unique = true), which always generates a random name (e.g. UK_3u5h7y36qqa13y3mauc5xxayq).
There is a bug report to solve this issue, so i...