JAVA编程题目,共四题,做其中一题就够了,答:} public class MyTriangle implements ShapeArea { double x,y,z,s;//x,y,z :double型,表示三角形的三条边 public MyTriangle(double x, double y, double z) {//方法:MyTriangle(double x, double y, double z):构造函数,给三条边和s赋值;this.x = x;this.y = y;this.z = ...