question: @ Override public int read ( char cbuf [ ] , int off , int len ) throws IOException { ensureOpen ( ) ; if ( len == 0 ) { return 0 ; } if ( next >= length ) return - 1 ; int n = Math . min ( length - next , len ) ; str . getChars ( next , next + n , cbuf , off ) ; next += n ; return n ; }
target:  Reads characters into a portion of an array.