android/guava/src/com/google/common/collect/ArrayTable.java
@Override
  public boolean contains(@NullableDecl Object rowKey, @NullableDecl Object columnKey) {
    return containsRow(rowKey) && containsColumn(columnKey);
  }
@Override
  public boolean contains(@NullableDecl Object rowKey, @NullableDecl Object columnKey) {
    return containsRow(rowKey) && containsColumn(columnKey);
  }
Returns {@code true} if the provided keys are among the keys provided when the table was
constructed.