我正在try 将下面的Java代码移植到DART，我对此感到困惑.
在Java中，Iterable接口是使用一种方法进行清理的地方，实现这一点非常简单.
如何最好地将此代码转换为DART？
/**
* Chess squares represented as a bitmap.
*/
public class ChessSquares implements Iterable<ChessSquare> {
private static class ChessSquaresIterator implements Iterator<ChessSquare> {
long bits;
int nextBit;
public ChessSquaresIterator(long bits) {
this.bits = bits;
nextBit = Long.numberOfTrailingZeros(bits);
}
@Override
public boolean hasNext() {
return (nextBit < 64);
}
@Override
public ChessSquare next() {
ChessSquare sq = ChessSquare.values()[nextBit];
bits = bits & ~sq.bit;
nextBit = Long.numberOfTrailingZeros(bits);
return sq;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
@Override
public Iterator<ChessSquare> iterator() {
return new ChessSquaresIterator(bits);
}
...