java - 将值传递给类

Question

我正在尝试使用 java.awt.Point 将 x 和 y 坐标传递给类中的构造函数。我的主类抛出一个错误，说“构造函数四边形(int，int，int，int，int，int，int，int)未定义。我在传递给构造函数时想到'公共(public)四边形(点...点)'我可以将坐标作为一个简单的列表传递。有人可以告诉我这几行代码可能出了问题吗？

主要

import java.awt.Point;


    public class QuadrilateralTest
    {
        public static void main(String[] args)
        {
            Quadrilateral quadrilateral = new Quadrilateral(1, 1, 6, 2, 6, 9, 2, 7);
System.out.printf("%s %s %s %s %s\n", quadrilateral);
        }
    }

四边形类

import java.awt.Point;


public class Quadrilateral
{
    //points contain x and y coordinates
    private Point point1;
    private Point point2;
    private Point point3;
    private Point point4;


    public Quadrilateral(Point... points)
    {
        point1 = new Point(1, 2);
        point2 = new Point(3, 4);
        point3 = new Point(5, 6);
        point4 = new Point(7, 8);       
    }

    //setters and getters
    public Point getPoint1()
    {
        return point1;
    }

    public Point getPoint2()
    {
        return point2;
    }

    public Point getPoint3()
    {
        return point3;
    }

    public Point getPoint4()
    {
        return point4;
    }

    public String toString()
    {
         return ("\nThe Points of the Quadrilateral are:\n " +
                getPoint1() +"," + getPoint2() +"," + getPoint3() + "," + getPoint4())+"\n";
    }

}

Answer 1

你的代码根本没有意义，你有 varargs Points 参数，但没有在构造函数中使用它们，如果你不需要输入参数，你可以用无参数构造函数替换它

 public Quadrilateral()
    {
        point1 = new Point(1, 2);
        point2 = new Point(3, 4);
        point3 = new Point(5, 6);
        point4 = new Point(7, 8);       
    }

并在main()中执行操作

Quadrilateral quadrilateral = new Quadrilateral();

如果您确实想将参数作为可变参数传递和使用Point，请让您的构造函数使用参数的值:-

public Quadrilateral(Point... points){

if((points.length>0)&&(points[0]!=null)){ //make sure to check this condition to allow user to input any number of parameters
point1=points[0];
}

if((points.length>1)&&(points[1]!=null)){
point2=points[1];
}
.
.
}

然后你可以在main()中编写:-

Point point1 =new Point(1,2);
Point point2 =new Point(1,2);
Quadrilateral quad=new Quadrilateral(point1,point2);