帮我写一段代码，1）设计一个点的类，属性为坐标x和y，方法有构造方法，set方法，get方法，toString方法等。 （2）设计线段类，属性为两个点，方法有构造方法，set方法，get方法，toString方法以及求两点距离的方法 （3）设计主类，键盘输入任意两个点，求出两点间的距离。

好的，我可以帮您写这段代码，以下是代码实现：

点类：

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

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

    public void setX(int x) {
        this.x = x;
    }

    public void setY(int y) {
        this.y = y;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

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

线段类：

public class Line {
    private Point p1;
    private Point p2;

    public Line(Point p1, Point p2) {
        this.p1 = p1;
        this.p2 = p2;
    }

    public void setP1(Point p1) {
        this.p1 = p1;
    }

    public void setP2(Point p2) {
        this.p2 = p2;
    }

    public Point getP1() {
        return p1;
    }

    public Point getP2() {
        return p2;
    }

    public double getLength() {
        int deltaX = p2.getX() - p1.getX();
        int deltaY = p2.getY() - p1.getY();
        return Math.sqrt(deltaX * deltaX + deltaY * deltaY);
    }

    @Override
    public String toString() {
        return "Line " + p1.toString() + "-" + p2.toString();
    }
}

主类：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        System.out.println("Please enter the coordinates of point 1:");
        int x1 = input.nextInt();
        int y1 = input.nextInt();
        Point p1 = new Point(x1, y1);

        System.out.println("Please enter the coordinates of point 2:");
        int x2 = input.nextInt();
        int y2 = input.nextInt();
        Point p2 = new Point(x2, y2);

        Line line = new Line(p1, p2);
        System.out.println("The distance between " + p1.toString() + " and " + p2.toString() + " is " + line.getLength());
    }
}

请注意，上述代码仅供参考，您可以根据需要进行修改。