Can you list the main types of blocks used for initial data initialization in programming?

In Java, the following main types of blocks are used for initial data initialization:

• Static initializer blocks — executed once when the class is loaded. Used for initializing static variables.

static {
    // initialization code
}

• Instance initializer blocks — executed when each object is created, before the constructor is called.

{
    // initialization code for each object
}

• Constructors — special methods called when an object is created, for initializing fields.

These blocks allow flexible management of the data initialization process within a class.