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Convert a RGB Color Value to a Hexadecimal String
In my Java application, I was able to get the Color of a JButton in terms of red, green and blue; I have stored these values in three int s.
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Interface vs Abstract Class (general OO)
...lly seems to be focusing on .NET use of these terms.
In .NET (similar for Java):
interfaces can have no state or implementation
a class that implements an interface must provide an implementation of all the methods of that interface
abstract classes may contain state (data members) and/or impleme...
How to get the result of OnPostExecute() to main activity because AsyncTask is a separate class?
...evelopers, one can use AutoResetEvents to achieve this and there is also a java implementation for autoresetevents but this is much cleaner. By the way, is ProcessFinish thread safe?
– Syler
Nov 29 '13 at 23:35
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Why would I use a templating engine? jsp include and jstl vs tiles, freemarker, velocity, sitemesh
...out nowadays.
JSP 2+
People claiming that JSP will make it hard to avoid Java code in templates is bogus. You just shouldn't do it and with this version it's unnecessary to do so. Version 2 supports calling methods using EL which is a big advantage compared to previous versions.
With JSTL tags yo...
Pick a random value from an enum?
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Arrays in Java are mutable so if you have a array field and return it in a public method the caller can modify it and it modifies the private filed so you need to defensively copy the array. If you call that method lots of times it can...
ActiveMQ or RabbitMQ or ZeroMQ or [closed]
...ly, all 3 products:
have client apis for the most common languages (C++, Java, .Net, Python, Php, Ruby, …)
have strong documentation
are actively supported
share
edited A...
Find Oracle JDBC driver in Maven repository
... file which in this case is
http://www.oracle.com/technology/software/tech/java/sqlj_jdbc/index.html.
Once you've downloaded the JAR just add it to your computer repository with (note I pulled the groupId, artifactId and version from the POM):
mvn install:install-file -DgroupId=com.oracle -Dartifa...
Is there a way to avoid null check before the for-each loop iteration starts? [duplicate]
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In Java 8 there is another solution available by using java.util.Optional and the ifPresent-method.
Optional.ofNullable(list1).ifPresent(l -> l.forEach(item -> {/* do stuff */}));
So, not a solution for the exact proble...
Solving a “communications link failure” with JDBC and MySQL [duplicate]
...number
interactive_timeout = number
connect_timeout = number
Make sure Java isn't translating 'localhost' to [:::1] instead of [127.0.0.1]
Since MySQL recognizes 127.0.0.1 (IPv4) but not :::1 (IPv6)
This could be avoided by using one of two approaches:
Option #1: In the connection string us...
What is an xs:NCName type and when should it be used?
... How can I convert that expression to a programming language like Java or JS?
– calbertts
May 4 '16 at 20:14
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