java.util.Calenderis an abstract class with a method getInstance() which returns an instance of the Calender class.
x<y? a:(b=p*q);the return value would be variable a because the x is 1 and less than y = 2;
|1. Tree of nodes||1. Sequence of events|
|2. Memory: Occupies more memory||2. Does use any memory preferred for small XML documents preferred for large documents|
|3. Slower at runtime||3. Faster at runtime|
|4. Stored as objects x||4. Objects are to be created|
|5. Programmatically easy, since||5. Need to write code for creating objects objects are to reffered|
|6. Ease of navigation||6. Backward navigation is not possible as it sequentially processes the document|