question: public void lineStartsAt ( int charInFile ) { if ( immutable ) { throw new UnsupportedOperationException ( ) ; } if ( nLines == lineNums . length ) { int [ ] newLineNums = new int [ nLines * 2 ] ; System . arraycopy ( lineNums , 0 , newLineNums , 0 , nLines ) ; lineNums = newLineNums ; } lineNums [ nLines ++ ] = charInFile ; cachedCharInFile = - 1 ; }
target:  Add a line break.