automobile.java

北京大学出版社的

package questions.c9;
public class Automobile {
   public static void main( String[] args ) {
      Automobile a = new Automobile();
      // create 4 instances of the Tire class, each
      // with object a as the enclosing instance
   }
   class Tire {
      private double pressure;
      public void setPressure( double p ) {
         pressure = p;
      }
      public double getPressure() {
         return pressure;
      }
   }
}