question: public void insertRow ( int rowIndex , RowSpec rowSpec ) { if ( rowIndex < 1 || rowIndex > getRowCount ( ) ) { throw new IndexOutOfBoundsException ( "The row index " + rowIndex + " must be in the range [1, " + getRowCount ( ) + "]." ) ; } rowSpecs . add ( rowIndex - 1 , rowSpec ) ; shiftComponentsVertically ( rowIndex , false ) ; adjustGroupIndices ( rowGroupIndices , rowIndex , false ) ; }
target:  Inserts the specified column at the specified position. Shifts components that intersect the new column to the right and readjusts column groups.<p> The component shift works as follows: components that were located on the right hand side of the inserted column are shifted one column to the right; component column span is increased by one if it intersects the new column.<p> Column group indices that are greater or equal than the given column index will be increased by one.