创建一个三角形类，成员变量三边，方法求周长，创建类主类A来测试它。

package com.homework.zw;

public class Sanjiao
{
    private double border1;
    private double border2;
    private double border3;
    
    
    public double Zhouchang(double b1,double b2, double b3)
    {
        border1=b1;
        border2=b2;
        border3=b3;
        return border1+border2+border3;
    }
}

package com.homework.zw;

public class Textzhouchang 
{

    public static void main(String[] args)
    {
        Sanjiao sj=new Sanjiao();
        System.out.println("三角形的周长为："+sj.Zhouchang(25.3,24,40));
    }

}