How a CT system works. 1  A motorized table moves the patient (Figure 3) through a circular opening in the CT imaging system. 2  As the patient passes through the CT imaging system, a source of x rays rotates around the inside of the circular opening. A single rotation takes about 1 second.
Static blocks are mainly used for initialization of static variables of class which you can't do with the help of constructors. Here are some rules which governs functioning of static blocks:-. 1) They are called when a class is loaded into the JVM. 2) They are executed in the order which they appear in the class. 3) They are executed only once. 4) They are used as class level members only - which means you CANNOT put them inside any methods.
The keyword static allows main() to be called without having to instantiate a particular instance of the class. This is necessary since main() is called by the Java interpreter before any objects are made. The keyword void simply tells the compiler that main() does not return a value.gain static method of a particular class can be accessed only by referring to the class like: Class_name.method_name(); So a class need not to be instantiated before accessing a static method. So the main() method is declared as static so that it can be accessed without creating an object of that class.