Question

创建一个Shape接口，该接口具有area（）方法，该方法将形状区域返回为double。创建实现Shape接口的类Circle和Rectangle。这些类具有反映其构造函数设置的尺寸（圆的半径，矩形的高度和宽度）的属性。

使用setColour（Color c），setPosition（int x，int y）和draw（Graphics g）方法创建Drawable接口。使用适当的构造函数创建DrawableCircle和DrawableRectangle类，它们分别扩展Circle和Rectangle并实现Drawable接口。

创建一个ShapesDriver类，它扩展了Frame并在其中包含main和paint（Graphics g）方法。在ShapesDriver中创建一个Drawable类型的ArrayList。在此数组列表中放置一个DrawableCircle和一个DrawableRectangle，您可以在其中设置尺寸，位置和颜色。在paint方法中迭代ArrayList并为每个形状调用draw方法。

这是我必须去的地方，但我似乎无法让可绘制的课程工作？

包装形状;

public interface Shape
{
    public double area();
}

包装形状;

public abstract class Circle implements Shape
{
    private double radius;

    Circle(double radius)
    {
        this.radius = radius;
    }

    public double area()
    {
        return radius;
    }

}

包装形状;

public abstract class Rectangle implements Shape
{
    public double height, width;

    Rectangle(double Height, double Width)
    {
        this.height = Height;
        this.width = Width;
    }

    public double area()
    {
        return width * height;
    }
}

包装形状;

import java.awt.*;

public interface Drawable
{ 
    public void setColour(Color c);
    public void setPosition(double x, double y);
    public void draw(Graphics g);
}

包装形状;

import java.awt.Color;
import java.awt.Graphics;

public class DrawableCircle extends Circle implements Drawable
{
    public DrawableCircle(double radius)
    {
        super(radius);
    }

    @Override
    public void setColour(Color c)
    {
        c = Color.ORANGE;
    }

    @Override
    public void setPosition(int x, int y)
    {
        x = 100;
        y = 150;
    }

    @Override
    public void draw(Graphics g)
    {
        //g.drawOval(x, y, width, height);
    }

}

包装形状;

import java.awt.Color;
import java.awt.Graphics;

public class DrawableRectangle extends Rectangle implements Drawable
{
    private double x, y;

    public DrawableRectangle(double height, double width)
    {
        super(height, width);
    }

    @Override
    public void setColour(Color c)
    {
        this.setColour(c);
    }

    @Override
    public void setPosition(double x, double y)
    {
        this.x = x;
        this.y = y;
    }

    @Override
    public void draw(Graphics g)
    {
        g.drawRect(x, y, width, height);
    }

}

Answer 1

这应该让你入门

public interface Shape {
    public double area(); 
}

public class Circle implements Shape{
    // constructors
    // radius
    // implement area();
}

public class Rectangle implements Shape {
    // constructors
    // height, width
    // implement area();
}

public interface Drawable {
    public void setColor(Color c);
    public void setPoistion(int x, int y);
    public void draw(Graphics g);
}

public class DrawableCirlce extends Circle implements Drawable {
    // constructors
    // implement setColor();
    // implement setPosition();
    // implement draw();
}

public class DrawableRectangle extends Rectangle implements Drawable {
    // constructors
    // implement setColor();
    // implement setPosition();
    // implement draw();
}

使用以下标准实现Shapes应用程序 - 小项目

1 个答案: