Selection Sort

package iteration;

public interface Iterable {
    public Iterator iterator();
}

package dataStructures;

import iteration.Iterable;

public interface List extends Iterable {
    public void insert(int index, Object value)
            throws IndexOutOfBoundsException;
    public void add(Object value);
    public Object delete(int index) throws IndexOutOfBoundsException;
    public boolean delete(Object value);
    public void clear();
    public Object set(int index, Object value)
            throws IndexOutOfBoundsException;
    public Object get(int index) throws IndexOutOfBoundsException;
    public int indexOf(Object value);
    public boolean contains(Object value);
    public int size();
    public boolean isEmpty();
}

package sorting;

import dataStructures.List;

public interface ListSorter {
    public List sort(List list);
}

Package sorting;

import dataStructures.List;

public class SelectionSortListSorter implements ListSorter {
    private final Comparator _comparator;

    public SelectionSortListSorter(Comparator comparator) {
        assert comparator != null : "comparator cannot be null";
        _comparator = comparator;
    }

    public List sort(List list) {
        assert list != null : "list cannot be null";
        int size = list.size();
        for (int slot = 0; slot < size - 1; ++slot) {
            int smallest = slot;
            for (int check = slot + 1; check < size; ++check) { // inner loop
                if (_comparator.compare(list.get(check), list.get(smallest)) < 0) {
                    smallest = check;
                }
            }
            swap(list, smallest, slot);
        }
        return list;

    }

    private void swap(List list, int left, int right) {
        if (left == right) {
            return;
        }
        Object temp = list.get(left);
        list.set(left, list.get(right));
        list.set(right, temp);
    }
}