根据给定的GeometricObject类层次图，分别实现GeometricObject、Circle和Triangle类。要求： （1）按照类图，定义各类的数据域属性和方法。 （2）默认的GeometricObject的颜色为white。默认的Circle对象的半径为10。默认的Triangle对象的三边为（3，4，5）。 （3）GeometricObject类的toString()方法，返回对象的颜色信息。Circle和Triangle的toString()方法，覆盖父类的toString()，分别返回颜色、半径或边长的信息。 （4）GeometricObject类实现java.lang.Comparable接口，覆盖public int compareTo()方法，实现两个几何对象在周长上的比较。 （5）Circle和Triangle类分别覆盖实现getPerimeter()方法。

以下是GeometricObject类的实现：

public abstract class GeometricObject implements Comparable<GeometricObject> {
    private String color;

    public GeometricObject() {
        this.color = "white";
    }

    public GeometricObject(String color) {
        this.color = color;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public abstract double getArea();

    public abstract double getPerimeter();

    @Override
    public String toString() {
        return "GeometricObject{" +
                "color='" + color + '\'' +
                '}';
    }

    @Override
    public int compareTo(GeometricObject o) {
        if (this.getPerimeter() > o.getPerimeter()) {
            return 1;
        } else if (this.getPerimeter() < o.getPerimeter()) {
            return -1;
        } else {
            return 0;
        }
    }
}

以下是Circle类的实现：

public class Circle extends GeometricObject {
    private double radius;

    public Circle() {
        super();
        this.radius = 10;
    }

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

    public Circle(double radius, String color) {
        super(color);
        this.radius = radius;
    }

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    @Override
    public double getArea() {
        return Math.PI * Math.pow(radius, 2);
    }

    @Override
    public double getPerimeter() {
        return 2 * Math.PI * radius;
    }

    @Override
    public String toString() {
        return "Circle{" +
                "color='" + getColor() + '\'' +
                ", radius=" + radius +
                '}';
    }
}

以下是Triangle类的实现：

public class Triangle extends GeometricObject {
    private double side1;
    private double side2;
    private double side3;

    public Triangle() {
        super();
        this.side1 = 3;
        this.side2 = 4;
        this.side3 = 5;
    }

    public Triangle(double side1, double side2, double side3) {
        super();
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
    }

    public Triangle(double side1, double side2, double side3, String color) {
        super(color);
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
    }

    public double getSide1() {
        return side1;
    }

    public void setSide1(double side1) {
        this.side1 = side1;
    }

    public double getSide2() {
        return side2;
    }

    public void setSide2(double side2) {
        this.side2 = side2;
    }

    public double getSide3() {
        return side3;
    }

    public void setSide3(double side3) {
        this.side3 = side3;
    }

    @Override
    public double getArea() {
        double p = (side1 + side2 + side3) / 2;
        return Math.sqrt(p * (p - side1) * (p - side2) * (p - side3));
    }

    @Override
    public double getPerimeter() {
        return side1 + side2 + side3;
    }

    @Override
    public String toString() {
        return "Triangle{" +
                "color='" + getColor() + '\'' +
                ", side1=" + side1 +
                ", side2=" + side2 +
                ", side3=" + side3 +
                '}';
    }
}