package java1;public class Sanjiaoxing {            public double Zhouchang(double a,double b,double c)    {        return (a+b+c);    }}//调用 Zhouchang         　　　　　Sanjiaoxing s1=new Sanjiaoxing();        System.out.println("三角形的周长为:"+s1.Zhouchang(1.2, 2.3, 3.4));