Meaning of implements when defining a new class

Question

I saw this code

class BinTree1 implements BinTree{
    Object val;
    BinTree1 left, right;
    // abstr(null) = E
    // abstr (val, left, right) =
    // N((abstr left) val (abstr right))

    public BinTree1 (BinTree1 l, Object o, BinTree1 r){
        val = o;
        left = l;
        right = r;
    }

    public Object val() {
        return val;
    }

I wonder what this implements means? I was searching the web, but all I found was something about interfaces...

When talking about C++ then it means nothing because there is no such thing in C++. What you have there is a piece of *Java* code. — Some programmer dude, Apr 23 '14 at 11:52
In C++, it means nothing. In whatever language this is, it probably means that `BinTree` is an interface, and `BinTree1` a class implementing that interface. In C++, you'd do that by inheriting from an abstract class. — Mike Seymour, Apr 23 '14 at 11:52
@JoachimPileborg Also note the public specifiers. Definitively, is Java — Manu343726, Apr 23 '14 at 11:54
Okay. Funny outcome. Then this will be the problem. :D Thanks! — xamiax, Apr 23 '14 at 11:54
@Manu343726 And why the downvotes? The OP clearly didn't know this wasn't C++ code, so what? — SingerOfTheFall, Apr 23 '14 at 11:56
Why stop searching when you got to _something about interfaces_? Delving a little deeper would at a minimum let you know it's not C++, or at best would introduce a new realm of programming in other languages. — TripeHound, Apr 23 '14 at 12:00

score 0 · Accepted Answer · edited May 23 '17 at 12:14

0

As is already stated in the comments: this is probably java code.

See this answer which explains the "implements" keyword and also the difference to the "extends" keyword which is corresponding to c++ inheritance. (You tagged your answer with c++ so I assume you know inheritance in c++ and were confused about the keyword.)

edited May 23 '17 at 12:14

Community

1
1

answered Apr 23 '14 at 12:45

PsiX

1,661
1
17
35

Meaning of implements when defining a new class

1 Answers1