Java 构造IntList

public class IntList {
    public int first;
    public IntList rest;

    public IntList(int f, IntList r) {
        first = f;
        rest = r;
    }

    public int size() {
        if (this.rest == null) {
            return 1;
        }
        return 1 + this.rest.size();
    }

    public int iterateSize() {
        IntList p = this;
        int totalSize = 0;
        while(p != null) {
            totalSize += 1;
            p = p.rest;
        }
        return totalSize;
    }

    public static void main(String[] args) {
        // Build a IntList
        IntList L = new IntList(15, null);
        L = new IntList(10, L);
        L = new IntList(5, L);

        System.out.println(L.size());
        System.out.println(L.iterateSize());


    }
}