创建一个Point类，包括坐标x,y.然后创建一个MyPoint类，定一两个读写变量start和end，数据类型为Point。MyPoint()方法：计算start和end之间的距离并输出start和end坐标以及距离信息

首先，我们可以创建一个名为`Point`的基础类，包含坐标属性`x`和`y`：

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 the 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;
    }
}

接着，我们创建一个名为`MyPoint`的派生类，它继承自`Point`并添加了开始点(start)和结束点(end)及其相关方法：

public class MyPoint extends Point {
    private Point start;
    private Point end;

    public MyPoint(Point start, Point end) {
        super(start.getX(), start.getY()); // 使用构造函数初始化坐标
        this.start = start;
        this.end = end;
    }

    // Getter and setter for start and end points
    public Point getStart() {
        return start;
    }

    public void setStart(Point start) {
        this.start = start;
    }

    public Point getEnd() {
        return end;
    }

    public void setEnd(Point end) {
        this.end = end;
    }

    // Method to calculate distance between start and end points
    public double calculateDistance() {
        double distance = Math.sqrt(Math.pow((end.getX() - start.getX()), 2)
                + Math.pow((end.getY() - start.getY()), 2));
        System.out.println("Start point: (" + start.getX() + ", " + start.getY()
                + ")");
        System.out.println("End point: (" + end.getX() + ", " + end.getY() + ")");
        System.out.println("Distance: " + distance);
        return distance;
    }
}

现在，你可以实例化`MyPoint`类，并计算两点之间的距离：

public static void main(String[] args) {
    Point p1 = new Point(0, 0);
    Point p2 = new Point(3, 4);
    MyPoint myPoint = new MyPoint(p1, p2);
    myPoint.calculateDistance();
}