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When and why JPA entities should implement Serializable interface?
...ty class must implement the Serializable interface.
"JSR 220: Enterprise JavaBeansTM,Version 3.0 Java Persistence API Version 3.0, Final Release May 2, 2006"
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How to Sign an Already Compiled Apk
...t to sign your unsigned apk.
Use the keytool provided by the JDK found in %JAVA_HOME%/bin/
keytool -genkey -v -keystore my.keystore -keyalg RSA -keysize 2048 -validity 10000 -alias app
Step 2 or 4: Zipalign
zipalign which is a tool provided by the Android SDK found in e.g. %ANDROID_HOME%/sdk/bui...
Possible heap pollution via varargs parameter
I understand this occurs with Java 7 when using varargs with a generic type;
5 Answers
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Return a “NULL” object if search result not found
I'm pretty new to C++ so I tend to design with a lot of Java-isms while I'm learning. Anyway, in Java, if I had class with a 'search' method that would return an object T from a Collection< T > that matched a specific parameter, I would return that object and if the object was not found in...
How to round up the result of integer division?
...of how to display pagination controls, when using a language such as C# or Java.
16 Answers
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Debugging sqlite database on the device
...elete, insert rows to your tables .Everything from your app.
Its a single java activity file ,just add the java file to your source folder.When the development is done remove the java file from your src folder thats it .
It helped me a lot .Hope it helps you too .
You can view the 1 minute demo h...
Difference between HashMap, LinkedHashMap and TreeMap
What is the difference between HashMap , LinkedHashMap and TreeMap in Java?
I don't see any difference in the output as all the three has keySet and values . What are Hashtable s?
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What Process is using all of my disk IO
... 53124K 0K 98% java
358 0K 636K 0K 1% jbd2/dm-0-8
13893 0K 192K 72K ...
Sending and Parsing JSON Objects in Android [closed]
...s tiny (50kB). Functionality is more limited (no annotations, just regular Java Beans), but performance-wise should be fast, and initialization (first-call) overhead very low as well.
So it just might be good choice, especially for smaller apps.
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Final arguments in interface methods - what's the point?
In Java, it is perfectly legal to define final arguments in interface methods and do not obey that in the implementing class, e.g.:
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