Tuesday 6 October 2015

Static block vs Static initialization

Static Block and Static variables initialized when the class loaded to JVM.
So, the order of execution is sequential.


public class StaticBlock {
      static {
            modifyIn = "static block 1";
            System.out.println("static block 1");
      }
     
      static {
            modifyIn = "static block 2";
            System.out.println("static block 2");
      }
     
      static String modifyIn = "static variable";

      public static void main(String args[]) {
            // modifyIn = String value modified by :static variable
            System.out.println("String value modified by :" + modifyIn);
      }
}

Output:
static block 1
static block 2
String value modified by :static variable



public class StaticBlock {
     
      static String modifyIn = "static variable";
     
      static {
            modifyIn = "static block 1";
            System.out.println("static block 1");
      }
     
      static {
            modifyIn = "static block 2";
            System.out.println("static block 2");
      }
     

      public static void main(String args[]) {
            // modifyIn = String value modified by :static block 2
            System.out.println("String value modified by :" + modifyIn);
      }
}
Output:
static block 1
static block 2
String value modified by :static block 2



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