Java访问实例变量和方法

public class Puppy {

   int puppyAge;



   public Puppy(String name) {

      // This constructor has one parameter, name.

      System.out.println("Name chosen is :" + name );

   }



   public void setAge( int age ) {

      puppyAge = age;

   }



   public int getAge( ) {

      System.out.println("Puppy's age is :" + puppyAge );

      return puppyAge;

   }



   public static void main(String []args) {

      /* Object creation */

      Puppy myPuppy = new Puppy( "tommy" );



      /* Call class method to set puppy's age */

      myPuppy.setAge( 2 );



      /* Call another class method to get puppy's age */

      myPuppy.getAge( );



      /* You can access instance variable as follows as well */

      System.out.println("Variable Value :" + myPuppy.puppyAge );

   }

}