"modifier interface not allowed here" compiler error

Question

Consider the following code fragment:
public void someMethod(int val){
interface ISomeInterface {int anyval=10;}
This does not compile ("modifier interface not allowed here"). What am I missing? Thanks in advance.
Ref: http://www.norvig.com/java-iaq.html#fold

Answer 1

Nothing to apologise. The posting is almost like ...
public void someMethod(int val){
static int x;
but its is different. Thanks.
It's completely different than that. It's just like this:
public class SomeClass {
  public void someMethod(int val) {
    public class SomeClassWithinAMethodWhichIsNotAllowed {
      // members of illegal class go here
    // local variables and code for someMethod go here
  // other members of SomeClass go here