Implementing tail class

Question

I am a beginner in Java and I have tried to implement a tail and I've made all the others methods, but at the toString() method, the program won't work. Here's my attempt:

class Tail {
    int n;
    Node prim;
    Node last;

    class Node {
        Node next;
        int info;
    }

    Tail() {
        prim = null;
        last = null;
        n = 0;
    }

    public String toString() {
        StringBuilder s = new StringBuilder();
        for (int info : this)
            s.append(info + " ");
        return s.toString();
    //return this.info.toString();
    }

It gives an error if I try to return this.info.toString() . I would appreciate any advice or solution for solving this problem, thanks

'info' is a primitive int. you cannot call 'toString()' on primitive types — usha, Oct 24 '16 at 17:06
Tail doesn't implement `Iterable`, and isn't an array, so you can't use it in am enhanced for loop like that. — Andy Turner, Oct 24 '16 at 17:08
Where are the info objects coming from? If you want to use the "for (int info : this)" construction, then Tail needs to implement Iterable — dantiston, Oct 24 '16 at 17:09

score 0 · Accepted Answer · edited May 23 '17 at 12:00

0

your code below is incorrect:

for (int info : this)
s.append(info + " ");

'this' refers to the current instance of Tail - which is all of its properties (n, prim, and last) & methods. If you want to overwrite toString() using the three properties refer to this answer for how to write your for loop:

How to get the fields in an Object via reflection?

edited May 23 '17 at 12:00

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answered Oct 24 '16 at 17:17

donlys

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Implementing tail class

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