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Non static blocks in java example

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instanceof java

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Non static blocks in java example Posted: Mar 15, 2016 2:22 PM
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Non Static Blocks in java

  • When ever object created non static blocks will be executed before the execution of constructor
  • Non static blocks are class level block which does not have prototype


  1. package nonstaticblocks;
  2. public class A {
  3.  
  4.    {
  5.         
  6.        System.out.println("non static block executed");
  7.  
  8.     }
  9.  
  10. }


What is the need of Non static blocks in java?

  • To execute any logic whenever object is created irrespective of constructor used in object creation.

Who will execute Non static blocks?

  • Non static blocks are automatically called by JVM for every object creation in java stack area

How many Non static blocks we can create?
  • We can create any number of Non static blocks

Order of execution of non static blocks

  • Order of execution of non static blocks will be order as they are defined.
  1. package nonstaticblocks;
  2. public class A {
  3.  
  4. {

  6.   System.out.println("first block");
  7. } 
  8.  
  9. {
  10.  System.out.println("second block");
  11. }
  12.  
  13. {
  14.  System.out.println("third block");
  15. }
  16. public static void main(String[] args) {
  17.   A obj= new A();
  18. }
  19. }

 Output:

  1. first block
  2. second block
  3. third block


 Order of execution of non static blocks with respect to constructor?



non static blocks in java example program


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