/guava/guava/src/com/google/common/collect/TreeBasedTable.java
@CheckForNull C upperBound;
@CheckForNull final C upperBound;
@Override public SortedMap<C, V> row(R rowKey) { return new TreeRow(rowKey); } private class TreeRow extends Row implements SortedMap<C, V> { @CheckForNull final C lowerBound; <extra_id_0> TreeRow(R rowKey) { this(rowKey, null, null); } TreeRow(R rowKey, @CheckForNull C lowerBound, @CheckForNull C upperBound) { super(rowKey); this.lowerBound = lowerBound;