java 类和对象基础题 三角形

package lianxiti;

public class SanJiaoXing
{

    double a;
    double b;
    double c;
    double zhouchang;
    SanJiaoXing(double a,double b,double c)
    {
        this.a=a;
        this.b=b;
        this.c=c;
        
    }
    
    void getZhouchang ()
    {
        if(a+b>c&a+c>b&b+c>a&a!=0&b!=0&c!=0)
        {
        
        zhouchang=a+b+c;
        System.out.println("三角形的周长是："+this.zhouchang);
        
    }
        else
        {
            System.out.println("您输入有误，请重新输入：");
        }

}
    }

package lianxiti;

public class A {

    public static void main(String[] args)
    {
        SanJiaoXing sjx1 = new SanJiaoXing(2,3,4);
        sjx1.getZhouchang();

        SanJiaoXing sjx2 = new SanJiaoXing(1,3,4);
        sjx2.getZhouchang();
    }

}