Javatpoint Logo
Javatpoint Logo

Sorting in Collection

We can sort the elements of:

  1. String objects
  2. Wrapper class objects
  3. User-defined class objects
Collections class provides static methods for sorting the elements of a collection. If collection elements are of a Set type, we can use TreeSet. However, we cannot sort the elements of List. Collections class provides methods for sorting the elements of List type elements.

Method of Collections class for sorting List elements

public void sort(List list): is used to sort the elements of List. List elements must be of the Comparable type.

Note: String class and Wrapper classes implement the Comparable interface. So if you store the objects of string or wrapper classes, it will be Comparable.

Example to sort string objects

Test it Now
Mukesh
Saurav
Tahir
Viru
       

Example to sort string objects in reverse order

Viru
Tahir
Saurav
Mukesh
       

Example to sort Wrapper class objects

101
201
230
              

Example to sort user-defined class objects

Mukesh
Saurav
Tahir
Viru
              




Please Share

facebook twitter google plus pinterest

Learn Latest Tutorials


Preparation


B.Tech / MCA