objref.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

package chapter7;
public class ObjRef 
{
   public static void main(String [] args)
   {
	   int a = 2;
	   int b= a;
	   b++;
	   System.out.println("a=" + a + ",b=" + b);
	   Sphere2 globe = new Sphere2();
	   Sphere2 ball = globe;
	   ball.radius= 10; //设置Radius的值
	   System.out.println("globe.radius=" + globe.radius + 
			   ",ball.radius=" + ball.radius  );
	   ball = null;
	   System.out.println("globe.radius=" + globe.radius);
   }
}