How can be define static block in java. And why it use?

If you're familiar with C#, then static blocks in Java resemble static constructors in C#. However, a Java class can contain several static blocks which are executed in order by the JVM, once only, when the class is loaded and before any static method of the class is called.

The idea is to provide more complicated initialization of static fields than can be done by just assigning them simple values where they are declared.

Because, they run automatically before any static method of a class, it follows that static blocks will run even before the main() method is called, The benefit of this is that static fields of the containing class will already have been initialized, one way or the other, before the main() method runs.

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Vulpes14y ago
If you're familiar with C#, then static blocks in Java resemble static constructors in C#. However, a Java class can contain several static blocks which are executed in order by the JVM, once only, when the class is loaded and before any static method of the class is called.

The idea is to provide more complicated initialization of static fields than can be done by just assigning them simple values where they are declared.

Because, they run automatically before any static method of a class, it follows that static blocks will run even before the main() method is called, The benefit of this is that static fields of the containing class will already have been initialized, one way or the other, before the main() method runs.