在Java中从派生类调用基类构造函数

本文介绍了在Java中从派生类调用基类构造函数的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

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，其四面都是等于。我的正多边形的构造函数应该是什么？

Now a regular polygon is a polygon whose all sides are equal. What should be the constructor of my regular polygon?

public Regularpolygon extends Polygon{ //constructor ??? }

推荐答案

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 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)); } }