用java编写一个图形类，该类具有长和高属性，具有求面积的方法

发布网友发布时间：2022-05-20 20:19

共3个回答

热心网友时间：2023-11-22 13:09

//长方形
class Retangle extends Graph {
    @Override
    public int square() {
        return getHeight() * getWidth();
    }
}
//三角
//这里默认长度是底的长度
class Triangle extends Graph {
    @Override
    public int square() {
        return (getHeight() * getWidth()) /2;
    }
}
//图形
abstract class Graph {
    private int height;
    private int width;

    public abstract int square();

    public int getHeight() {
        return height;
    }

    public void setHeight(int height) {
        this.height = height;
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }
}
public class Test {
    public static void main(String[] args){
        Graph g = new Retangle();
        g.setHeight(2);
        g.setWidth(3);
        System.out.println("长方形的面积是：" + g.square());
        Graph g1 = new Triangle();
        g1.setHeight(2);
        g1.setWidth(3);
        System.out.println("三角形的面积是：" + g1.square());
    }
}

追问

追答你的JAVA版本问题，你把@voerride删除了吧

热心网友时间：2023-11-22 13:10

package .shape;

abstract class Shape {//定义抽象父类Shape
public double width;
public double height;
abstract double getArea(); //定义求解面积的方法
}

package .shape;

public class Rect extends Shape {

@Override
double getArea() {
return width*height;
}
}

package .shape;

public class Trangle extends Shape {
double sideA;
double sideB;
double sideC;
boolean isTrangel;
public Trangle(double a,double b,double c)
{
sideA=a;sideB=b;sideC=c;
if(a+b>c&&a+c>b&&b+c>a)
{
System.out.println("我是一个三角形");
isTrangel = true;
}
else
{
System.out.println("我不是一个三角形");
isTrangel = false;
}
}

@Override
double getArea() {
double area = 0d;
if(isTrangel)
{
double p=(sideA+sideB+sideC)/2.0;
area=Math.sqrt(p*(p-sideA)*(p-sideB)*(p-sideC));
System.out.println("三角形面积是:"+area);
}
else
{
System.out.println("不是一个三角形，不能计算面积");
}
return area;
}

}

package .shape;

public class TestArea {

public static void main(String[] args) {
Shape rectangle = new Rect();
rectangle.height=1.1;
rectangle.width=5.0;
System.out.println("矩形的面积是："+rectangle.getArea());
//三角形
Shape tran = new Trangle(2.3,4.5,5.6);

System.out.println("三角形的面积是："+tran.getArea());
}

}

运行结果：
矩形的面积是：5.5
我是一个三角形
三角形面积是:4.966246067202064
三角形的面积是：4.966246067202064

热心网友时间：2023-11-22 13:10

/**
* 定义一个图形类
*
*/
public class Graph {
    //图形的长高属性
    public float length;
    public float high;

    public Graph(float length,float high) {
        this.high = high;
        this.length = length;
    }


    public float getArea(){

        return 0;
    }

}

/**
* 矩形的类
*
*/
public class Rectangle extends Graph{

    public Rectangle(float length, float high) {
        super(length, high);
    }

    public float getArea(){


        float area = this.high * this.length;
        return area;
    }

}

/**
* 三角形的类
*
*/
public class Triangle extends Graph{

    public Triangle(float length, float high) {
        super(length, high);
    }


    public float getArea(){
        float area = (float) (this.high * this.length * 0.5);
        return area;
    }

}/**
* 主测试类
*
*/
public class MainTest {

    public static void main(String[] args) {

        Graph rectangle = new Rectangle(10, 5);
        Graph triangle = new Triangle(10, 5);

        System.out.println("矩形的面积是：" + rectangle.getArea());
        System.out.println("三角形的面积是：" + triangle.getArea());
    }

}