java：如果告诉你a,b,c三条边,判断是否可以构成三角形,如果能计算出这个三角形的面积和周长?

【程序代码】 public class Js { private double a; private double b; private double c; Js(double a,double b,double c) { this.a = a; this.b = b; this.c = c; } public double getA() { return a; } public do...