Default values and initialization in Java

by

In the first code sample, a is a main method local variable. Method local variables need to be initialized before using them.

In the second code sample, a is class member variable, hence it will be initialized to the default value.

More Related Contents:

  1. Initialization of an ArrayList in one line
  2. Variable might not have been initialized error
  3. What is Double Brace initialization in Java?
  4. Efficiency of Java “Double Brace Initialization”?
  5. How to initialize an array in Java?
  6. Static Initialization Blocks
  7. Difference between declaring variables before or in loop?
  8. In ArrayBlockingQueue, why copy final member field into local final variable?
  9. How can I initialise a static Map?
  10. What is an initialization block?
  11. When does static class initialization happen?
  12. Are fields initialized before constructor code is run in Java?
  13. Initializing multiple variables to the same value in Java
  14. Declaring and initializing variables within Java switches
  15. How to initialize an array of objects in Java
  16. Default constructors and inheritance in Java
  17. How to initialize HashSet values by construction?
  18. When is the static block of a class executed?
  19. java.lang.OutOfMemoryError: PermGen space [closed]
  20. Meaning of new Class(…){{…}} initialization idiom [duplicate]
  21. Cannot instantiate the type List [duplicate]
  22. Inner class and local variables
  23. Default value of ‘boolean’ and ‘Boolean’ in Java
  24. When does static initialization happen?
  25. Java Singleton Pattern
  26. Is the class loaded when its reference is declared?
  27. Java: how to initialize String[]?
  28. Initialize field before super constructor runs?
  29. Initialize final variable before constructor in Java
  30. Java : in what order are static final fields initialized?

Leave a Comment