public class Scope {
  public static void main(String[] args) {
    int outer = 1;                                   // Exists throughout the method

    {
       // You cannot refer to a variable before its declaration.
       // System.out.println("inner = " + inner);    //  Uncomment this for an error.

       int inner = 2;
       System.out.println("inner = " + inner);       // Now it's OK.
       System.out.println("outer = " + outer);       // And outer is still here.
    
       // All variables defined in the enclosing outer block still exist,
       // So you cannot redefine them here.
       // int outer = 5;                                  // Uncomment this for an error.
    }

    // Any variables declared in the previous inner block no longer exist.
    // So you cannot reference them.
    // System.out.println("inner = " + inner);      // Uncomment this for an error.

    // Since inner no longer exists, you can redefine it here.
    int inner = 3;
    System.out.println("inner = " + inner);       
    System.out.println("outer = " + outer);       // And outer is still here.

  }
}