{} inside a method.

[Meg Adal]

I wrote following program,it compiles and runs fine.But I was expecting compilation error for {}
I am not able to undestand why does Java allows to have {} inside a method?
Is it treated as Instance Initializer block?

  
public class Test
{
    public static void main(String[] args)
    {
       new Test().myTest();
     }

     public void myTest()
     {
 
       {//I was expecting compilation error here
            System.out.println("HELLO!");
        }//here too.
     }
}

[Jon Dornback]

it's perfectly legal to have a code block within a code block. i don't think it is commonly used, but the main effect is to limit the scope.
the code below shows an example of how it works:

public class Test{
   public static void main(String args[]){
      int x = 1;
      { // nested block
         int y = 2;
         System.out.println(x);  // print 1
         System.out.println(y);  // print 2
      }
      System.out.println(x);  // print 2
      // System.out.println(y);  // compile error if uncommented
   }
}

[Ron Newman]

Also, empty code blocks are perfectly legal, and occasionally useful (for instance, to act as placeholders for future code).

[Meg Adal]

Thanks All.