scope.java

I holp somebody will need it.

// Fig. 6.11: Scope.java
// Scope class demonstrates field and local variable scopes.

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

   // method begin creates and initializes local variable x 
   // and calls methods useLocalVariable and useField
   public void begin()
   {
      int x = 5; // method's local variable x shadows field x

      System.out.printf( "local x in method begin 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 method begin is %d\n", x );
   } // end method begin

   // create and initialize local variable x during each call
   public 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 );
   } // end method useLocalVariable

   // modify class Scope's field x during each call
   public 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 );
   } // end method useField
} // end class Scope

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