What is the purpose of sublist in Java?

The subList method in Java is a method in the List interface that is used to extract a specified range of elements from the original list and return a new list. Its function is to take out the elements in the specified range of the original list to create a new list, but the new list shares the same memory space as the original list, meaning that modifications to the sublist will affect the original list.

The syntax of the subList method is as follows:

List<E> subList(int fromIndex, int toIndex)

“其中，fromIndex represents the starting position in the sublist (inclusive), while toIndex represents the ending position in the sublist (exclusive).”

The use of the subList method makes it easy to slice and extract specific elements within a specified range from a list for further processing. This is very useful in situations where you need to split, filter, or perform other operations on a list.