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static block

Posted on 2000-02-09
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Last Modified: 2010-04-16
Hi,

I wonder what would be the meaning of making a block of statements , that is not a method, static in a class.
If a method is static then it can be called without instanciating the object that contains that method, but what about a piece of code like this:

public class SomeClass implements Driver, PoolLog{
      static{
            SomeClass d = null;
            try{
                  d = new SomeClass();
                  DriverManager.registerDriver(d);
            }catch(SQLException e){
                  d.log(e, "Unable to register driver with manager!");
            }
      }

      public SomeClass(){
            someVar = new Hashtable();
      }

......

}
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Question by:simi
2 Comments
 
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Accepted Solution

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jerch earned 80 total points
ID: 2504313
Static block is actually called static initialization block.  Basically, it is usually used in initializing static fields.  It is most useful when simple initialization clauses on the field declaration aren't up to the task of initialization. For example, creating a static array and initializing its elements sometimes must be done with executable statements.  Here is a small code that initializes a small array of primes.

class Primes {
protected static int[] primes = new int[4];

static {
primes[0] = 2;

for (int i = 1; i < primes.length. i++)
primes[i] = aStaticMethodCall();
}
}

Take note that you can only call static method.

PS. By the way SomeClass d would be useless since it will be out of scope. Of course you can declare variable for temporary use.
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Author Comment

by:simi
ID: 2504933
Thanks.
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