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Why are you not able to declare a class as static in Java?
Why are you not able to declare a class as static in Java?
14 Answers
14
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JAX-RS — How to return JSON and HTTP status code together?
...e with other implementations) and throw any of the existing sub-classes of javax.ws.rs.WebApplicationException. These are pre-defined exception types that are pre-mapped to different error codes, for example:
BadRequestException (400)
InternalServerErrorException (500)
NotFoundException (404)
Et...
Converting Secret Key into a String and Vice Versa
...ing and use it in a SecretKeySpec to rebuild your original SecretKey.
For Java 8
SecretKey to String:
// create new key
SecretKey secretKey = KeyGenerator.getInstance("AES").generateKey();
// get base64 encoded version of the key
String encodedKey = Base64.getEncoder().encodeToString(secretKey.ge...
Do spurious wakeups in Java actually happen?
... from Source and found it reasonable enough. Also read
Spurious wakeups in Java and how to avoid them.
PS: Above link is to my personal blog that has additional details about spurious wakeups.
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How to Set a Custom Font in the ActionBar Title?
...I lost good 10 minutes trying to figure it out. If you don't, you will get java.lang.RuntimeException: Unable to start activity ComponentInfo{com.your.pckage}: java.lang.RuntimeException: native typeface cannot be made
– Dzhuneyt
Dec 15 '13 at 13:00
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How can I restart a Java application?
How can I restart a Java AWT application? I have a button to which I have attached an event handler. What code should I use to restart the application?
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How is an overloaded method chosen when a parameter is the literal null value?
...s fine:
String x = null;
The String overload here is chosen because the Java compiler picks the most specific overload, as per section 15.12.2.5 of the JLS. In particular:
The informal intuition is that one method is more specific than another if any invocation handled by the first method cou...
How to check if a String contains only ASCII?
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You can do it with java.nio.charset.Charset.
import java.nio.charset.Charset;
public class StringUtils {
public static boolean isPureAscii(String v) {
return Charset.forName("US-ASCII").newEncoder().canEncode(v);
// or "ISO-8859-1"...
Why charset names are not constants?
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Two years later, and Java 7's StandardCharsets now defines constants for the 6 standard charsets.
If you are stuck on Java 5/6, you can use Guava's Charsets constants, as suggested by Kevin Bourrillion and Jon Skeet.
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How to execute a java .class from the command line
I have a compiled java class:
7 Answers
7
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