定义一个具有三条边的三角形类Triangle。在三角形中，任意两边之和大于第三边。三角形类Triangle写遵从这一个规则。定义一个IllegalTriangleException类，修改类Triangle的构造方法，如果创建的三角形的边违反了这一规则，则抛出一个IllegalTriangleException对象。

Triangle类的代码如下：

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

    public Triangle(double side1, double side2, double side3) throws IllegalTriangleException {
        if (side1 + side2 <= side3 || side1 + side3 <= side2 || side2 + side3 <= side1) {
            throw new IllegalTriangleException("Invalid triangle sides");
        }
        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 getPerimeter() {
        return side1 + side2 + side3;
    }

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

IllegalTriangleException类的代码如下：

public class IllegalTriangleException extends Exception {
    public IllegalTriangleException(String message) {
        super(message);
    }
}