[Bredge]

Basically I have to write a simple readingbook list. A reading list is a set of book titles that a course tutor recommends students on a course to read.

First thing I had to do was write a method to add a book to this list..Done

Then to print the list which Im stuck on .... Heres what I have

public void printBooks()
{	   
System.out.println(courseBooks);
	}

Supposed to print my list but doesn't

myReadingList.printBooks(myReadingList.getCourseBooks());

Keep getting the error message

Semantic error: Message printBooks( java.util.HashSet ) not understood by class'ReadingList'

This post has been edited by leegt5: 18 March 2009 - 05:06 PM

[Bredge]

Solved it thanks

[Bredge]

How would I print each element of the CourseBooks list on a new line. At the minute it prints to screen like so.

[Crypto, Using UML, Weaving the
Web, Prey]

[pbl]

You posted a question on Enigma machine without showing us the method that shuffles the message and you expected an answer.
Now you show us code for a println() that does not work and you dont tell us what courseBooks is ?
We can't do miracle.
"Mechanic please fix my car... but don't open the hood "

[Bredge]

Sorry pbl, Im trying not to post too much of my work on the internet as Uni don't like it, well on their forums anyway...

/**
 * Print titles from courseBooks List
 */
public void printBooks(Collection aCol)
{
System.out.println(courseBooks);
} 
}

This post has been edited by leegt5: 19 March 2009 - 03:39 PM

[BigAnt]

Quote

public void printBooks(Collection aCol)
{
System.out.println(courseBooks);
}

Do you want to print out the internal collection's or the one passed into the message?

To get each element on different line you will have to loop and print it out, as the default toString in JCF is to print the Collection like [ o1, o2, ...., on]

where on is the toString method on whatever is in the Collection

[Bredge]

Solved it using

public void printBooks(Collection aCol)
{
for (Object ReadingList : courseBooks) 
	System.out.println(ReadingList);
}

This post has been edited by leegt5: 19 March 2009 - 03:38 PM

[BigAnt]

Quote

public void printBooks(Collection aCol)
{
for (Object ReadingList : courseBooks)
System.out.println(ReadingList);
}

But why pass in the collection if you are using the internal collection to print out and never do anything with aCol