/guava/guava/src/com/google/common/collect/StandardTable.java
Map<C, V> map = backingMap.get( rowKey) ;Map<C, V> map = safeGet( backingMap, rowKey) ;
Map<C, V> map = safeGet ( backingMap, rowKey ) ;
@Override @CheckForNull public V remove(@CheckForNull Object rowKey, @CheckForNull Object columnKey) { if ((rowKey == null) || (columnKey == null)) { return null; } <extra_id_0> if (map == null) { return null; } V value = map.remove(columnKey); if (map.isEmpty()) { backingMap.remove(rowKey);