海伦公式求三角形面积java

以下是使用海伦公式求三角形面积的Java代码：

public class Point {
    private double x;
    private double y;

    public Point(double x, double y) {
        this.x = x;
        this.y = y;
    }

    public double getX() {
        return x;
    }

    public double getY() {
        return y;
    }
}

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

    public Triangle(Point a, Point b, Point c) {
        this.a = a;
        this.b = b;
        this.c = c;
    }

    public double getPerimeter() {
        double ab = Math.sqrt(Math.pow(a.getX() - b.getX(), 2) + Math.pow(a.getY() - b.getY(), 2));
        double bc = Math.sqrt(Math.pow(b.getX() - c.getX(), 2) + Math.pow(b.getY() - c.getY(), 2));
        double ac = Math.sqrt(Math.pow(a.getX() - c.getX(), 2) + Math.pow(a.getY() - c.getY(), 2));
        return ab + bc + ac;
    }

    public double getArea() {
        double ab = Math.sqrt(Math.pow(a.getX() - b.getX(), 2) + Math.pow(a.getY() - b.getY(), 2));
        double bc = Math.sqrt(Math.pow(b.getX() - c.getX(), 2) + Math.pow(b.getY() - c.getY(), 2));
        double ac = Math.sqrt(Math.pow(a.getX() - c.getX(), 2) + Math.pow(a.getY() - c.getY(), 2));
        double p = (ab + bc + ac) / 2;
        return Math.sqrt(p * (p - ab) * (p - bc) * (p - ac));
    }
}

public class Test {
    public static void main(String[] args) {
        Point a = new Point(0, 0);
        Point b = new Point(3, 0);
        Point c = new Point(0, 4);
        Triangle triangle = new Triangle(a, b, c);
        System.out.println("Perimeter: " + triangle.getPerimeter()); // 输出：Perimeter: 12.0
        System.out.println("Area: " + triangle.getArea()); // 输出：Area: 6.0
    }
}