）先创建一个Point类，然后定义Trianglele 类。在Trianglele类中定义三个Point的实体来表示一个三角形的三个点，再定义其构造方法对这三个点进行初始化，然后定义两个方法求三角形的周长、面积。在测试主类中创建一个对象，求给定三点的三角形的周长、面积。

在Java中，我们可以按照以下步骤创建一个`Point`类和`Triangle`类来实现这个功能：

首先，我们定义一个`Point`类，它将包含坐标信息：

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

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

    // getters and setters for x and y coordinates
    public double getX() { return x; }
    public void setX(double x) { this.x = x; }
    
    public double getY() { return y; }
    public void setY(double y) { this.y = y; }

    @Override
    public String toString() {
        return "Point{" +
                "x=" + x +
                ", y=" + y +
                '}';
}

接着，我们创建一个`Triangle`类，其中包含三个`Point`对象并提供计算周长和面积的方法：

public class Triangle {
    private Point pointA;
    private Point pointB;
    private Point pointC;

    public Triangle(Point pointA, Point pointB, Point pointC) {
        this.pointA = pointA;
        this.pointB = pointB;
        this.pointC = pointC;
    }

    // Calculate perimeter
    public double getPerimeter() {
        return Math.abs(pointA.getX() - pointB.getX()) + Math.abs(pointB.getX() - pointC.getX()) + Math.abs(pointC.getX() - pointA.getX())
             + Math.abs(pointA.getY() - pointB.getY()) + Math.abs(pointB.getY() - pointC.getY()) + Math.abs(pointC.getY() - pointA.getY());
    }

    // Calculate area using Heron's formula (assuming non-degenerate triangle)
    public double getArea() {
        double a = Math.abs(pointA.getX() - pointB.getX());
        double b = Math.abs(pointB.getX() - pointC.getX());
        double c = Math.abs(pointC.getX() - pointA.getX());

        double s = (a + b + c) / 2.0;
        return Math.sqrt(s * (s - a) * (s - b) * (s - c));
    }

    // Override toString() method for better representation
    @Override
    public String toString() {
        return "Triangle{" +
                "pointA=" + pointA +
                ", pointB=" + pointB +
                ", pointC=" + pointC +
                ", perimeter=" + getPerimeter() +
                ", area=" + getArea() +
                '}';
    }
}

最后，在测试主类`Main`中，我们可以实例化一个`Triangle`对象，并计算给定三点的三角形周长和面积：

public class Main {
    public static void main(String[] args) {
        Point p1 = new Point(0, 0);
        Point p2 = new Point(3, 4);
        Point p3 = new Point(6, 0);

        Triangle triangle = new Triangle(p1, p2, p3);
        System.out.println("Triangle: " + triangle);
        System.out.println("Perimeter: " + triangle.getPerimeter());
        System.out.println("Area: " + triangle.getArea());
    }
}

当你运行`main`方法时，会输出三角形的信息以及它的周长和面积。