java.util.Collections.sort() Method

Description

The sort(List<T>,Comparator<? super T>) method is used to sort the specified list according to the order induced by the specified comparator.

Declaration

Following is the declaration for java.util.Collections.sort() method.

public static <T> void sort(List<T> list,Comparator<? super T> c)

Parameters

• list − This is the list to be sorted.

• c − This is the comparator to determine the order of the list.

Return Value

NA

Exception

• ClassCastException − Throws if the list contains elements that are not mutually comparable using the specified comparator.

• UnsupportedOperationException − Throws if the specified list's list-iterator does not support the set operation.

Example

The following example shows the usage of java.util.Collections.sort()

package com.tutorialspoint;

import java.util.*;

public class CollectionsDemo {
   public static void main(String args[]) {  
      
      // create linked list object  	   
      LinkedList<Integer> list = new LinkedList<Integer>();  

      // populate the list 
      list.add(-28);
      list.add(20);
      list.add(-12);
      list.add(8);

      // sort the list
      Collections.sort(list, null);  

      System.out.println("List sorted in natural order: ");      
      
      for(int i : list) {
         System.out.println(i+ " ");
      }
   }
}

Let us compile and run the above program, this will produce the following result.

List sorted in natural order: 
-28 
-12 
8 
20