Static Block in Java

Question

I was looking over some code the other day and I came across   static               Coming from C    I had no idea why that was there  Its not an error because the code compiled fine  What is this  static  block of code

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Static block can be used to show that a program can run without main function also     static block   static block is used to initlize static data member of the clas at the time of clas loading   static block is exeuted before the main class B       static               System out println  Welcome to Java             System exit 0

User · Answer

A static block executes once in the life cycle of any program   another property of static block is that it executes before the main method

User · Answer

It s a block of code which is executed when the class gets loaded by a classloader  It is meant to do initialization of static members of the class   It is also possible to write non-static initializers  which look even stranger   public class Foo                    This code will be executed before every constructor            but after the call to super              Foo

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Static blocks are used for initializaing the code and  will be executed when JVM loads the class Refer to the below link which gives the detailed explanation  http   www jusfortechies com java core-java static-blocks php

User · Answer

yes  static block is used for initialize the code and it will load at the time JVM start for execution   static block is used in previous versions of java but in latest version it doesn t work

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It is a static initializer  It s executed when the class is loaded and a good place to put initialization of static variables   From http   java sun com docs books tutorial java javaOO initial html     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     If you have a class with a static look-up map it could look like this  class MyClass       static Map lt Double  String gt  labels      static           labels   new HashMap lt Double  String gt             labels put 5 5   five and a half            labels put 7 1   seven point 1                        It s useful since the above static field could not have been initialized using labels        It needs to call the put-method somehow

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It s a static initializer  It s executed when the class is loaded  or initialized  to be precise  but you usually don t notice the difference    It can be thought of as a  class constructor    Note that there are also instance initializers  which look the same  except that they don t have the static keyword  Those are run in addition to the code in the constructor when a new instance of the object is created

[java] Static Block in Java

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