用Java描述一个三角形,提供计算三角形面积方法.三角形的三个边长从键盘输入.

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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 double getB()
{ return b;
} public double getC()
{ return c;
} public double area()
{ double s1=(a+b+c)/2;
double s2 = s1*(s1-a)*(s1-b)*(s1-c);
double result = Math.sqrt(s2);
return result;
} } class Jxputer
{ public static void main(String[] args)
{ Js js = new Js(3,6,8);
System.out.println(三角形三边长度分别为：+a:+js.getA()+\tb:+js.getB()+\tc:+js.getC());
System.out.println(三角形面积为：+js.area()); }
}