math.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 Math
{
   public static double PI = 3.14;
   public static void main(String args[])
	{
		//Math.PI = 3.15;
		System.out.println(Math.PI);
		//System.out.println(PI2);
	}
}