[英]Calling a base class constructor from derived class in Java
我有一個課程如下:
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;
}
}
現在,正多邊形是一個多邊形,其邊是相等的。 什么應該是我的正多邊形的構造函數?
public Regularpolygon extends Polygon{
//constructor ???
}
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));
}
}
class Foo {
Foo(String str) { }
}
class Bar extends Foo {
Bar(String str) {
// Here I am explicitly calling the superclass
// constructor - since constructors are not inherited
// you must chain them like this.
super(str);
}
}
你的構造函數應該是
public Regularpolygon extends Polygon{
public Regularpolygon (int id,Point center,int noSides,int lengths[]){
super(id, center,noSides,lengths[]);
// YOUR CODE HERE
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.