编写一个代表一角形的类（Triangle.java）。其中，三条边a,b.c（数据类型为double类型）为二角形的属性，该类封装有求一角形的面积和周长的方法。分别针对给定的三条边进行测试（给定三条边已经满足三角形构成条件），输出面积和周长保留2位小数。

public class Triangle {
    private double a;
    private double b;
    private double c;

    // 构造方法，检查输入是否满足三角形条件
    public Triangle(double sideA, double sideB, double sideC) {
        if (sideA + sideB > sideC && sideA + sideC > sideB && sideB + sideC > sideA) {
            this.a = sideA;
            this.b = sideB;
            this.c = sideC;
        } else {
            throw new IllegalArgumentException("Invalid sides for a triangle.");
        }
    }

    // Getter methods
    public double getSideA() {
        return a;
    }

    public double getSideB() {
        return b;
    }

    public double getSideC() {
        return c;
    }

    // Setter methods
    public void setSideA(double sideA) {
        this.a = sideA;
    }

    public void setSideB(double sideB) {
        this.b = sideB;
    }

    public void setSideC(double sideC) {
        this.c = sideC;
    }

    // Calculate perimeter
    public double calculatePerimeter() {
        return a + b + c;
    }

    // Calculate area using Heron's formula
    public double calculateArea() {
        double semiPerimeter = calculatePerimeter() / 2;
        return Math.sqrt(semiPerimeter * (semiPerimeter - a) * (semiPerimeter - b) * (semiPerimeter - c));
    }

    // Test method
    public void test(double sideA, double sideB, double sideC) {
        try {
            Triangle triangle = new Triangle(sideA, sideB, sideC);
            System.out.printf("Triangle with sides %.2f, %.2f, %.2f:\n", sideA, sideB, sideC);
            System.out.printf("Perimeter: %.2f\n", triangle.calculatePerimeter());
            System.out.printf("Area: %.2f\n", triangle.calculateArea());
        } catch (IllegalArgumentException e) {
            System.out.println(e.getMessage());
        }
    }
}

// Test example
public static void main(String[] args) {
    double sideA = 3.0;
    double sideB = 4.0;
    double sideC = 5.0; // Pythagorean triple
    Triangle triangle = new Triangle(sideA, sideB, sideC);
    triangle.test(sideA, sideB, sideC);
}

这个`Triangle`类包含三条边作为属性，并在构造函数中检查它们是否能组成有效的三角形。提供求周长和面积的方法，最后的`test`方法用于测试给定的三边长度。如果输入的边长不符合三角形条件，会抛出异常并在`main`方法中捕获并显示错误消息。