java编写图形抽象类（Shape）

我来写一下吧：

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abstract class Shape{

private double c;

private double s;

public abstract void girth();

public abstract void area();

public void setGirth(double c){

this.c = c;

}

public void setArea(double s){

this.s = s;

}

public double getGirth(){

return c;

}

public double getArea(){

return s;

}

public void outInfo(){}

}

class Circle extends Shape{

private static final double PI = 3.1415926;

private double r;

//定义一个构造函数

public Circle(double r){

this.r = r;

}

//重写抽象方法

public void girth() {

double a =2*PI*r;

super.setGirth(a);

}

public void area() {

double b =PI*r*r;

super.setArea(b);

}

public void outInfo() {

this.girth();

this.area();

System.out.println("所求圆形周长为："+super.getGirth());

System.out.println("所求圆形面积为："+super.getArea());

}

}

class Rectangle extends Shape{

private double height;

private double width;

//定义一个构造函数

public Rectangle(double height,double width){

this.height = height;

this.width = width;

}

//重写抽象方法

public void girth() {

double a =2*(height+width);

super.setGirth(a);

}

public void area() {

double b =(height*width);

super.setArea(b);

}

public void outInfo() {

this.girth();

this.area();

System.out.println("所求矩形周长为："+super.getGirth());

System.out.println("所求矩形面积为："+super.getArea());

}

}

class Triangle extends Shape{

private double lengthA;

private double lengthB;

private double lengthC;

//定义一个构造函数

public Triangle(double lengthA,double lengthB,double lengthC){

this.lengthA = lengthA;

this.lengthB = lengthB;

this.lengthC = lengthC;

}

//重写抽象方法

public void girth() {

double a =(lengthA+lengthB+lengthC);

super.setGirth(a);

}

public void area() {

if((lengthA+lengthB lengthC) || (lengthA + lengthC lengthB) || (lengthB+lengthC lengthA)) {

System.out.println("两边之和必须大于第三个边");

System.exit(0);

}

double p = (lengthA+lengthB+lengthC)/2;

double b = Math.sqrt(p*(p-lengthA)*(p-lengthB)*(p-lengthC));

super.setArea(b);

}

public void outInfo() {

this.girth();

this.area();

System.out.println("所求三角形周长为："+super.getGirth());

System.out.println("所求三角形面积为："+super.getArea());

}

}

public class ShapeTest {

public static void main (String [] args){

Shape circle = new Circle(3.0);

Shape rectangle = new Rectangle(8.0,7.0);

Shape triangle = new Triangle(3.0,4.0,5.0);

circle.outInfo();

rectangle.outInfo();

triangle.outInfo();

}

}

java如何编程定义一个shape抽象类,具有求面积、求周长、显示输出功能？

楼主是不是想利用Java求shape文件中 面的面积，也就是polygon或者multipolygon的面积。实际上就是不规则多边形的面积，如果不用什么函数库（geotools）的话，还是有现成的公式的，非是通过定积分推倒了一个公式而已。\x0d\x0a需要注意的是:\x0d\x0a点要按照逆时针或者顺时针的顺序添加进list\x0d\x0apackage geodemo;\x0d\x0aimport java.awt.Point;\x0d\x0aimport java.util.ArrayList;\x0d\x0aimport java.util.List;\x0d\x0aimport org.opengis.feature.simple.SimpleFeature;\x0d\x0aimport com.vividsolutions.jts.geom.Geometry;\x0d\x0apublic class GetArea{\x0d\x0apublic static void main(String args[]){\x0d\x0aPoint p1 = new Point(1,0);\x0d\x0aPoint p2 = new Point(12,0);\x0d\x0aPoint p3 = new Point(10,10);\x0d\x0aPoint p4 = new Point(0,10);\x0d\x0aPoint p5= new Point(3,3);\x0d\x0aList list = new ArrayList();//泛型\x0d\x0alist.add(p1);\x0d\x0alist.add(p2);\x0d\x0alist.add(p3);\x0d\x0alist.add(p4);\x0d\x0alist.add(p5);\x0d\x0aGetArea t = new GetArea();\x0d\x0adouble area = t.getArea(list);\x0d\x0aSystem.out.println(area);\x0d\x0a}\x0d\x0apublic double getArea(List list)\x0d\x0a{\x0d\x0a//S = 0.5 * ( (x0*y1-x1*y0) + (x1*y2-x2*y1) + ... + (xn*y0-x0*yn) )\x0d\x0adouble area = 0.00;\x0d\x0afor(int i = 0;i

回答于 2022-11-16

JAVA编写一个名为Shape的接口类型？

public class Circle implements Shape{

public static void main(String[] args) {

Circle circle = new Circle();

float r = 5; //半径

System.out.println("圆面积：" + circle.getArea(r));

System.out.println("圆周长：" + circle.getCircumference(r));

}

@Override

public float getArea(float a) {

float pi = (float) Math.PI;

return pi * a * a;

}

@Override

public float getCircumference(float a) {

float pi = (float) Math.PI;

return 2 * pi * a;

}

}

public interface Shape {

float getArea(float a);

float getCircumference (float a);

}

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