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How can I sort a List alphabetically?
...ssuming that those are Strings, use the convenient static method sort…
java.util.Collections.sort(listOfCountryNames)
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String.equals versus == [duplicate]
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@mo in some cases even in java == can be misleading. Java caches strings and so something like this would return true. String a = "Hello"; String b = "Hello"; a == b is true even though one would normally expect the result to be false.
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Tracing XML request/responses with JAX-WS
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for this work in tomcat you need to add these commands to JAVA_OPTS in catalina.sh e.g. on the first line add: JAVA_OPTS=" -Dcom.sun.xml.ws.transport.http.client.HttpTransportPipe.dump=true -Dcom.sun.xml.internal.ws.transport.http.client.HttpTransportPipe.dump=true -Dcom.sun.xml.ws....
Why there is no ConcurrentHashSet against ConcurrentHashMap
...u use a method to produce a set from a given map (or map class).
Prior to Java 8, you produce a concurrent hash set backed by a concurrent hash map, by using Collections.newSetFromMap(map)
In Java 8 (pointed out by @Matt), you can get a concurrent hash set view via ConcurrentHashMap.newKeySet(). T...
Booleans, conditional operators and autoboxing
...rue ? null : false` - Boolean (autoboxing of 3rd operand to Boolean)
See Java Language Specification, section 15.25 Conditional Operator ? :
For E1, the types of the 2nd and 3rd operands are Boolean and boolean respectively, so this clause applies:
If one of the second and third operands is ...
How to check whether a string is Base64 encoded or not
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If you are using Java, you can actually use commons-codec library
import org.apache.commons.codec.binary.Base64;
String stringToBeChecked = "...";
boolean isBase64 = Base64.isArrayByteBase64(stringToBeChecked.getBytes());
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Flask-SQLalchemy update a row's information
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There is a method update on BaseQuery object in SQLAlchemy, which is returned by filter_by.
a...
Find where java class is loaded from
Does anyone know how to programmaticly find out where the java classloader actually loads the class from?
11 Answers
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“loop:” in Java code. What is this, and why does it compile?
...but as a side note:
I have heard of interview questions a la "Why is this Java code valid?" (stripped the simpler example; here's the meaner one, thx Tim Büthe):
url: http://www.myserver.com/myfile.mp3
downLoad(url);
Would you all know what this code is (apart from awful)?
Solution: two labels...
Encoding URL query parameters in Java
How does one encode query parameters to go on a url in Java? I know, this seems like an obvious and already asked question.
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