java实现三角形面积和周长的计算.doc

3先创建一个Point类，然后定义Trianglele类。在Trianglele类中定义三个Point的实体来表示一个三角形的三个点，再定义一个方法setTri对这三个点进行初始化，然后定义两个方法求三角形的周长、面积。在main()中创建一个对象，求给定三点的三角形的周长、面积。3将上题的方法setTri改用构造方法实现初始化。主类：Trianglele属性：Piont point Int side方法：Trianglete(point1,point2,point3); girth(trianglete); Area(tiranglete); 类名：point 属性： int xcoord int ycoord 方法： Point(x,y) package Three;import java.util.Scanner;public class Trianglele Point point1,point2,point3; double side1; double side2; double side3; public Trianglele(Point point1,Point point2,Point point3) /利用构造函数创建一个三角形，并求出边长 this.point1=point1; this.point2=point2; this.point3=point3; double sidex=point1.pointLen(point2, point3); this.side1=sidex; double sidey=point2.pointLen(point1, point3); this.side2=sidey;double sidez=point3.pointLen(point1, point2); this.side3=sidez; /*下面来求周长和面积 * param args */ public double area() /求面积 double x1,x2,y1,y2; double heigth,area; double sidemax,sidemin1,sidemin2; if(side1side2) sidemax=side1; x1=point1.xpoint; y1=point1.ypoint; x2=(point3.xpoint+point2.xpoint)*0.5; y2=(point3.ypoint+point2.ypoint)*0.5; sidemin1=side2; else sidemax=side2; sidemin1=side2; x1=point2.xpoint; y1=point2.ypoint; x2=(point3.xpoint+point1.xpoint)*0.5; y2=(point3.ypoint+point1.ypoint)*0.5; if(sidemaxside3)sidemin2=sidemax; sidemax=side3;x1=point3.xpoint; y1=point3.ypoint; x2=(point1.xpoint+point2.xpoint)*0.5; y2=(point1.ypoint+point2.ypoint)*0.5; else sidemin2=side3; if(sidemax*sidemax=sidemin1*sidemin1+sidemin2*sidemin2)area=sidemin1*sidemin2*0.5; else Point point=new Point(x1,y1); Point po=new Point(x2,y2); heigth=point.pointLen(point,po); area=sidemax*heigth*0.5; return area; public double girth() double girth; girth=side1+side2+side3; return girth; public static void main(String args) / TODO Auto-generated method stubboolean TF=false;while(TF=false) System.out.println(请输入你想要的三角形的三个坐标); Scanner s=new Scanner(System.in); Double x1=s.nextDouble(); Double y1=s.nextDouble(); Double x2=s.nextDouble(); Double y2=s.nextDouble(); Double x3=s.nextDouble(); Double y3=s.nextDouble(); Trianglele tri=new Trianglele(new Point(x1,y1),new Point(x2,y2),new Point(x3,y3); if(tri.side1tri.side2+tri.side3)&(tri.side2tri.side1+tri.side3)&(tri.side3tri.side2+tri.side1) double area=tri.area(); double gir=tri.girth(); System.out.println(这个三角形的面积为：+area+这个三角形的周长为+gir+ +程序到此结束!); TF=true; else TF=false; System.out.println(你所输入的三角形错误); package Three;import java.lang.Math;class Point double xpoint; double ypoint; public Point(double x,double y) xpoint=x; ypoint=y; public double pointLen(Point po1,Point po2) /求两个点之间的距离 double length; double len=