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2 3 4 5 6 7 8 9 10 11 12 13 14 15 import javautil*; public class Birthdays { public static void main(String[] args) { Map<Friends, String> hm = new HashMap<Friends, String>(); hmput(new Friends("Charis"), "Summer 2009"); hmput(new Friends("Draumur"), "Spring 2002"); Friends f = new Friends(args[0]); Systemoutprintln(hmget(f)); } } class Friends { String name; Friends(String n) { name = n; } }

You could use the tell function, since that takes into account the usual buffering; so you have to calculate the file position manually by totaling up the bytes read from the database If you had used read, seek, and print, then the standard buffering used may have affected the results, probably overwriting information Using sysread guarantees that the information read and written from the filehandle is what you received and supplied

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When reading and writing files using the standard line-based or record-based methods, you are normally processing individual records in sequence outputting or formatting the results as you read in the entire file in sequence However, if you are accessing fixed-length information for example, a database you are likely to require access to the information in a more random fashion In order to work correctly, you need to be able to discover your current location and set a new location within the file

The first requirement is to find your position within a file, which you do using the tell function:

And the command line invocation:

This returns the position of the file pointer, in bytes, within FILEHANDLE if specified, or the current default selected filehandle if none is specified The function returns undef if there is a problem getting the file position information, since a value of zero could just indicate that you re at the start of the file

The seek function positions the file pointer to the specified number of bytes within a file:

The function uses the fseek system function, and you have the same ability to position relative to three different points: the start, the end, and the current position You do this by specifying a value for WHENCE The possible values are 0, 1, and 2 for positions relative to the start of the file, the current position within the file, and end of the file If you import the IO::Seekable module, you can use the constants SEEK_SET, SEEK_CUR, and SEEK_END, respectively Zero sets the positioning relative to the start of the file For example, the line

seek DATA, 256, 0;

What is the result A null B Draumur C Spring 2002 D Compilation fails E F The output is unpredictable An exception is thrown at runtime

sets the file pointer to the 256th byte in the file Using a value of one sets the position relative to the current position; so the line

seek DATA, 128, 1;

seek DATA, -128, SEEK_CUR;

G Friends@XXXX (where XXXX is a representation of a hashcode)

moves back to byte 256 A WHENCE value of two moves the file relative to the end of the file, and the value of POSITION is generally specified as a negative number You can move to a point 80 bytes from the end of the file using a line like this:

seek DATA, -80, SEEK_END;

Make sure that the definition of the custom error handler precedes the call to set_error_ handler()

It s worth noting that the seek function resets the end-of-file condition You can use the SEEK_CUR constant with a WHENCE value of zero to achieve this, since the overall effect is to move nowhere If you were to use the SEEK_SET or SEEK_END function, you d have to use the tell function to discover the current location

Answer (for Objective 62): A is correct The Friends class doesn t override equals() and hashCode(), so the key to the HashMap is a specific instance of Friends, not the value of a given Friends instance s name B, C, D, E, F, and G are incorrect based on the above 9 Given:

7:

As you already know, the bulk of the functions that use filehandles rely on the buffering provided by the system s stdio functions The sysseek function is essentially identical to the seek function, except that it ignores the buffering on filehandles:

In the earlier database example, you might want to move to the last record in a database, which you could do with

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