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servlet tomcat servlet tomcat  It is not necessary to declare fields at the beginning of the class definition, although this is the most common practice. It is only necessary that they be declared and initialized before they are used. A is a normal block of code enclosed in braces, keyword. Here is an example: static { // whatever code is needed for initialization goes here } A class can have any number of static initialization blocks, and they can appear anywhere in the class body. The runtime system guarantees that static initialization blocks are called in the order that they appear in the source code.

servlet tomcat There is an alternative to static blocks —you can write a private static method: class Whatever { public static varType myVar = initializeClassVariable(); private static varType initializeClassVariable() { //initialization code goes here } } The advantage of private static methods is that they can be reused later if you need to reinitialize the class variable. Normally, you would put code to initialize an instance variable in a constructor. There are two alternatives to using a constructor to initialize instance variables: initializer blocks and final methods. Initializer blocks for instance variables look just like static initializer blocks, but without the keyword: { // whatever code is needed for initialization goes here } The Java compiler copies initializer blocks into every constructor. Therefore, this approach can be used to share a block of code between multiple constructors.

servlet tomcat A cannot be overridden in a subclass. This is discussed in the lesson on interfaces and inheritance. Here is an example of using a final method for initializing an instance variable: class Whatever { private varType myVar = initializeInstanceVariable(); protected final varType initializeInstanceVariable() { //initialization code goes here } } This is especially useful if subclasses might want to reuse the initialization method. The method is final because calling non-final methods during instance initialization can cause problems. Joshua Bloch describes this in more detail in .

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servlet tomcat