Define array from another array

Define array from another array

I'm trying to define an array starting from data that come from another
array. The code will explain the situation better than thousands words.
public class QualityCheck {
public QualityCheck (JTable table)
{
//the data come from a JTable (that represents a school timetable)
String [] dailyLessons= new String[table.getColumnCount()];
String [] dailyClasses= new String[table.getColumnCount()];
//checking all the days
for (int i=1; i<table.getColumnCount(); i++)
{
//checking all the hours in a day
for (int j=0; j<table.getRowCount(); j++)
{
//lesson is an array that contains the subject and the room in
which the subject is erogated
//lesson[0] contains the subject
//lesson[1] contains the room
String[] lesson =
((TabellaOrario.MyTableModel)table.getModel()).getLesson(j,i);
//I'd like to put ALL the daily subjects in dailyLesson
dailyLessons[j] = lesson[0];
//I'd like to put All the daily rooms in dailyClasses
dailyClasses[j] = lesson[1];
}
//trying if dailyLessons has the elements
for (String s: dailyLessons)
{
System.out.println(s);
}
}
}
}
If a run this code, the compiler protest with this error:
Exception in thread "AWT-EventQueue-0"
java.lang.ArrayIndexOutOfBoundsException: 7
and it evidence the string
dailyLessons[j] = lesson[0];
How can I do to define dailyLesson?