question: static void writeUTF ( OutputStream out , String str ) throws IOException { for ( int i = 0 , len = str . length ( ) ; i < len ; i ++ ) { int c = str . charAt ( i ) ; if ( ( c >= 0x0001 ) && ( c <= 0x007F ) ) { out . write ( c ) ; } else { if ( c > 0x07FF ) { out . write ( 0xE0 | ( ( c > > 12 ) & 0x0F ) ) ; out . write ( 0x80 | ( ( c > > 6 ) & 0x3F ) ) ; out . write ( 0x80 | ( ( c > > 0 ) & 0x3F ) ) ; } else { out . write ( 0xC0 | ( ( c > > 6 ) & 0x1F ) ) ; out . write ( 0x80 | ( ( c > > 0 ) & 0x3F ) ) ; } } } }
target:  Write a UTF string with a length to a stream.