Wywołanie konstruktora klasy bazowej z klasy pochodnej w Java

Question

Mam klasy następująco:

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; 
    } 
} 

Teraz wielokąt foremny to wielokąt, którego wszystkie boki są równe. Co powinno być konstruktorem mojego regularnego wielokąta?

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 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)); 
    } 
} 

Answer 2

Twój konstruktor powinien być

public Regularpolygon extends Polygon{ 

public Regularpolygon (int id,Point center,int noSides,int lengths[]){ 
super(id, center,noSides,lengths[]); 

// YOUR CODE HERE 

} 

} 

Answer 3

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); 
    } 
}