// Fig. 6.9: Scope.java
// Scope class demonstrates field and local variable scopes.

public class Scope {
   // field that is accessible to all methods of this class
   private static int x = 1;                               

   // method main creates and initializes local variable x 
   // and calls methods useLocalVariable and useField
   public static void main(String[] args) {
      int x = 5; // method's local variable x shadows field x

      System.out.printf("local x in main is %d%n", x);

      useLocalVariable(); // useLocalVariable has local x
      useField(); // useField uses class Scope's field x
      useLocalVariable(); // useLocalVariable reinitializes local x
      useField(); // class Scope's field x retains its value

      System.out.printf("%nlocal x in main is %d%n", x);
   } 

   // create and initialize local variable x during each call
   public static void useLocalVariable() {
      int x = 25; // initialized each time useLocalVariable is called

      System.out.printf(
         "%nlocal x on entering method useLocalVariable is %d%n", x);
      ++x; // modifies this method's local variable x
      System.out.printf(
         "local x before exiting method useLocalVariable is %d%n", x);
   } 

   // modify class Scope's field x during each call
   public static void useField() {
      System.out.printf(
         "%nfield x on entering method useField is %d%n", x);
      x *= 10; // modifies class Scope's field x
      System.out.printf(
         "field x before exiting method useField is %d%n", x);
   }
} 


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