设计抽象类GeometricObject及其子类Triangle和Circle

以下是GeometricObject抽象类及其子类Triangle和Circle的示例代码：

// GeometricObject.java
public abstract class GeometricObject {
    private String color;
    private boolean filled;

    public GeometricObject() {
        color = "white";
        filled = false;
    }

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

    public String getColor() {
        return color;
    }

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

    public boolean isFilled() {
        return filled;
    }

    public void setFilled(boolean filled) {
        this.filled = filled;
    }

    public abstract double getArea();

    public abstract double getPerimeter();
}


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

    public Triangle(double side1, double side2, double side3) {
        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 = getPerimeter() / 2;
        return Math.sqrt(p * (p - side1) * (p - side2) * (p - side3));
    }

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


// Circle.java
public class Circle extends GeometricObject {
    private double radius;

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

    public double getRadius() {
        return radius;
    }

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

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

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

GeometricObject抽象类中定义了几何对象的共同属性和方法，其中getArea和getPerimeter方法是抽象方法，需要在其子类中实现。Triangle和Circle类分别继承自GeometricObject抽象类，并实现了getArea和getPerimeter方法。