@Nullable
  public synchronized V remove(K key) {
      V oldValue = mMap.remove(key);
      mSizeInBytes -= getValueSizeInBytes(oldValue);
      return oldValue;
  }
@ Nullable public synchronized V remove ( K key ) { V oldValue = mMap . remove ( key ) ; mSizeInBytes -= getValueSizeInBytes ( oldValue ) ; return oldValue ; }
Removes the element from the map.