java设计一个Triangle类，继承自GeometricObject类，该类包括三角形三边（默认值1.0），返回面积，周长，及三角形的字符串描述。并且画出程序的类图

下面是Java中Triangle类的代码实现以及类图：

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

    public Triangle() {
        this.side1 = 1.0;
        this.side2 = 1.0;
        this.side3 = 1.0;
    }

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

    public double getSide1() {
        return side1;
    }

    public double getSide2() {
        return side2;
    }

    public double getSide3() {
        return side3;
    }

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

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

    public String toString() {
        return "Triangle: side1 = " + side1 + " side2 = " + side2 + " side3 = " + side3;
    }
}

下面是类图：

+-----------------+
| GeometricObject |
+-----------------+
| -color: String  |
| -filled: boolean|
| +GeometricObject()|
| +GeometricObject(color: String, filled: boolean)|
| +getColor(): String|
| +setColor(color: String): void|
| +isFilled(): boolean|
| +setFilled(filled: boolean): void|
| +getArea(): double|
| +getPerimeter(): double|
| +toString(): String|
+-----------------+
        ^
        |
+---------------+
|    Triangle   |
+---------------+
| -side1: double|
| -side2: double|
| -side3: double|
+---------------+
| +Triangle()|
| +Triangle(side1: double, side2: double, side3: double)|
| +getSide1(): double|
| +getSide2(): double|
| +getSide3(): double|
| +getArea(): double|
| +getPerimeter(): double|
| +toString(): String|
+---------------+