在Java中从派生类调用基类构造函数

Question

我有一个课程如下:

public class Polygon  extends Shape{

    private int noSides;
    private int lenghts[];

    public Polygon(int id,Point center,int noSides,int lengths[]) {
        super(id, center);
        this.noSides = noSides;
        this.lenghts = lengths;
    }
}

现在,正多边形是一个多边形,其边是相等的.什么应该是我的正多边形的构造函数？

public Regularpolygon extends Polygon{

//constructor ???
}

Answer 1

public class Polygon  extends Shape {    
    private int noSides;
    private int lenghts[];

    public Polygon(int id,Point center,int noSides,int lengths[]) {
        super(id, center);
        this.noSides = noSides;
        this.lenghts = lengths;
    }
}

public class RegularPolygon extends Polygon {
    private static int[] getFilledArray(int noSides, int length) {
        int[] a = new int[noSides];
        java.util.Arrays.fill(a, length);
        return a;
    }

    public RegularPolygon(int id, Point center, int noSides, int length) {
        super(id, center, noSides, getFilledArray(noSides, length));
    }
}