what is the difference between static variable and static block

[Anand Sivathanu]

what is the difference between static variable and static block in java

[Rob Spoor]

What's the difference between a variable and a constructor?

[marc weber]

Or more generally, ask yourself, "What is a 'block' of code? And what would happen if I put a 'static' modifier in front of it?"

[Anand Sivathanu]

if i put static for a block of code,then it will be loaded once when is class is loaded by jvm.
static variable is class variable,which will be loaded when the class is loaded.

i donot know the exact difference between these to two?
can you explain?

[Abimaran Kugathasan]

Anand Sivathanu wrote:
i donot know the exact difference between these to two?
can you explain?

You mean to say, the order which the load?

[marc weber]

Anand Sivathanu wrote:if i put static for a block of code,then it will be loaded once when is class is loaded by jvm...

The block will do more than just load. When a class is loaded, a static block of code will execute.

Look at this code and try to predict the output. Then test it by compiling and running.

class StaticBlockTest {
  int a = valueInt("non-static var a");
  static int b = valueInt("static var b");

  static int valueInt(String var) {
    System.out.println("Valuing " + var);
    return 1;
  }

  {
    System.out.println("In non-static block.");
  }

  static {
    System.out.println("In static block.");
  }

  StaticBlockTest() {
    System.out.println("In constructor.");
  }

  public static void main(String[] args) {
    System.out.println("In main. Calling constructor...");
    StaticBlockTest test = new StaticBlockTest();
    System.out.println("Done with main.");
  }
}