Help with Solving these with explanations and the ones that cannot be solved suggest the process I should follow, thanks

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1.)

public boolean contains(Object o) { if (o instanceof HexTile) { HexTile h = (HexTile)o; //TODO check if there is an entry in contents equal to h } return false; } 

2.)

public boolean remove(Object o) { if (o instanceof HexTile) { HexTile h = (HexTile)o; if (contents.get(h.getLocation()) == h.getTerrain()) { //TODO remove the hex tile return true; } } return false; } 

3.)

public HexTile next() { Map.Entry e = base.next(); return null; // TODO: generate hex tile on demand based on entry //look at the getValue and getKey methods for Entry }