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Possible Duplicate:
Static initializer in Java
I have a few years’ experience with Java, but I’ve recently run across something I’ve never seen before:
public class Project{
...
static{
initDataTypeMapping();
}
...
}
How does this method signature work? Is this in fact even technically a method? I’m wondering why one wouldn’t simply put the the method call to initDataTypeMapping() in the constructor. Just trying to increase my understanding so I don’t mess something up. Thanks!
This is known as a static initializer.
The code in the
static { }block is run when the class is first loaded by the classloader (which is usually, but not always, when code that refers to the class is first loaded/executed), and is guaranteed to be run in a thread-safe manner.See this question also.