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How to check if a String contains only ASCII?
...
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"...
How do I use the new computeIfAbsent function?
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Suppose you have the following code:
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class Test {
public static void main(String[] s) {
Map<String, Boolean> whoLetDogsOut = new ConcurrentHashMap<>();
whoLetDo...
Returning from a finally block in Java
...o find that it's possible to have a return statement in a finally block in Java.
6 Answers
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How to get IP address of the device from code?
...his is my helper util to read IP and MAC addresses. Implementation is pure-java, but I have a comment block in getMACAddress() which could read the value from the special Linux(Android) file. I've run this code only on few devices and Emulator but let me know here if you find weird results.
// Andr...
About Python's built in sort() method
...t file for a textual explanation, results, etc etc.
If you prefer reading Java code than C code, you could look at Joshua Bloch's implementation of timsort in and for Java (Joshua's also the guy who implemented, in 1997, the modified mergesort that's still used in Java, and one can hope that Java w...
How can I convert an image into a Base64 string?
...on Android, here's a helper copied from the React Native codebase:
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import android.util.Base64;
import androi...
Fade In Fade Out Android Animation in Java
... to let the native C++ code in Android do all this instead of calling in a Java loop.
– RoundSparrow hilltx
Sep 30 '14 at 14:04
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show 2 mor...
Is there an easy way to attach source in Eclipse?
...ng the properties for a project.
Go to Properties (for the Project) -> Java Build Path -> Libraries
Select the Library you want to attach source/javadoc for and then expand it, you'll see a list like so:
Source Attachment: (none)
Javadoc location: (none)
Native library location: (none)
Acce...
Why would an Enum implement an Interface?
I just found out that Java allows enums to implement an interface. What would be a good use case for that?
16 Answers
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Maven does not find JUnit tests to run
... Note that the surefire documentation now claims that **/*Tests.java is a default include!
– Gareth
Oct 13 '17 at 9:54
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