Given an unsorted ArrayList, the task is to sort this ArrayList in ascending order in Java.
Examples:
Input: Unsorted ArrayList: [Geeks, For, ForGeeks, GeeksForGeeks, A computer portal]
Output: Sorted ArrayList: [A computer portal, For, ForGeeks, Geeks, GeeksForGeeks]
Input: Unsorted ArrayList: [Geeks, For, ForGeeks]
Output: Sorted ArrayList: [For, ForGeeks, Geeks]
Approach: An ArrayList can be Sorted by using the sort() method of the Collections Class in Java. This sort() method takes the collection to be sorted as the parameter and returns a Collection sorted in the Ascending Order by default.
Syntax:
Collections.sort(ArrayList);
Below is the implementation of the above approach:
import java.util.*;
public class GFG {
public static void main(String args[])
{
ArrayList<String>
list = new ArrayList<String>();
list.add( "Geeks" );
list.add( "For" );
list.add( "ForGeeks" );
list.add( "GeeksForGeeks" );
list.add( "A computer portal" );
System.out.println( "Unsorted ArrayList: "
+ list);
Collections.sort(list);
System.out.println( "Sorted ArrayList "
+ "in Ascending order : "
+ list);
}
}
|
Output:
Unsorted ArrayList: [Geeks, For, ForGeeks, GeeksForGeeks, A computer portal]
Sorted ArrayList in Ascending order : [A computer portal, For, ForGeeks, Geeks, GeeksForGeeks]