大约有 7,486 项符合查询结果（耗时：0.0216秒） [XML]
When should we implement Serializable interface?
...riablizble interface to all of domain models...
– theJava
Dec 28 '10 at 19:39
8
@theJava It's not...
Download attachments using Java Mail
...
Some time saver for the code where you save the attachment file :
with javax mail version 1.4 and after , you can say
// SECURITY LEAK - do not do this! Do not trust the 'getFileName' input. Imagine it is: "../etc/passwd", for example.
// bodyPart.saveFile("/tmp/" + bodyPart.getFileName());
i...
How to Copy Text to Clip Board in Android?
...
Yesterday I made this class. Take it, it's for all API Levels
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import android.annotation.SuppressLint;
import android.content.ClipData;
import android.content.Cli...
Why is “int i = 2147483647 + 1;” OK, but “byte b = 127 + 1;” is not compilable?
...
Actually, today I read some of Java puzzlers , including a puzzle just about that... See here: javapuzzlers.com/java-puzzlers-sampler.pdf - puzzle 3
– MByD
Jul 31 '11 at 13:47
...
HTTPURLConnection Doesn't Follow Redirect from HTTP to HTTPS
I can't understand why Java's HttpURLConnection does not follow an HTTP redirect from an HTTP to an HTTPS URL. I use the following code to get the page at https://httpstat.us/ :
...
How to initialize log4j properly?
...(Look for the "Default Initialization Procedure" section).
For example:
java -Dlog4j.configuration=customName ....
Will cause log4j to look for a file called customName on the classpath.
If you are having problems I find it helpful to turn on the log4j.debug:
-Dlog4j.debug
It will print to ...
How to synchronize a static variable among threads running different instances of a class in Java?
...se it's a read / modify / write sequence. As noted in a different answer, java.util.concurrent.atomic.AtomicInteger is likely the right choice here.
– fadden
Apr 17 '13 at 23:35
4...
What are enums and why are they useful?
...ulation above does not give you is nice switch cases. For enum types, the Java switch uses the type of its variable to infer the scope of enum cases, so for the enum Color above you merely need to say:
Color color = ... ;
switch (color) {
case RED:
...
break;
}
Note it's not ...
Convert JSON to Map
...r. :-)
For such a simple mapping, most tools from http://json.org (section java) would work.
For one of them (Jackson https://github.com/FasterXML/jackson-databind/#5-minute-tutorial-streaming-parser-generator), you'd do:
Map<String,Object> result =
new ObjectMapper().readValue(JSON_SO...
How can I create tests in Android Studio?
...sts that you will do.
Local unit tests. These are run locally on the JVM (Java Virtual Machine). Since they are local, they are fast. You can use them to test the parts of your code that just need Java and not the Android APIs. (Sometimes you can make a fake API object to test more things locally. ...