why am I getting verify error ???

[josephine chen]

class Tree{
  public Tree(){System.out.println("hi");} 
  public static void main(String args[]){
      Tree t=new Tree();
      Tree.Tree1 t1=new Tree().new Tree1(); 
      t.amethod(); 
      t1.amethod();  
  }
   public void amethod(){
      System.out.println("Hi method 1");
   } 
 
   public static class Tree1{
       public void amethod(){
         System.out.println("from inner");
       }
   } 
}

/*Exception in thread "main" java.lang.VerifyError: (class: Tree, method: main si
nature: ([Ljava/lang/String; )V) Expecting to find unitialized object on stack*/

[This message has been edited by Jim Yingst (edited February 15, 2000).]

[Tony Alicea]

Because Tree1 is a static nested class, the instantiation
"Tree.Tree1 t1=new Tree().new Tree1(); "
is not appropriate. The standard and more clear way of doing it is
Tree.Tree1 t1 = new Tree.Tree1();
You must be using JDK 1.2.2. I understand that 1.3 Beta does not do that.

[Jim Yingst]

Adding to what Tony said: although new Tree().new Tree1() is unnecessary for a static class, it isn't actually wrong - the fact that you get an error here is a bug in 1.2.2. I can confirm that 1.3 beta works correctly here.
Incidentally, you can also change your original program to remove "static" from the declaration of Tree1 (but keeping the "new Tree().new Tree1()"), and then everything works fine, even under 1.2.2.