import java.util.ArrayList;
import java.util.Collections;

public class SortElements {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    ArrayList arrayList = new ArrayList();
        //Add elements to Arraylist
        arrayList.add("1");
        arrayList.add("3");
        arrayList.add("5");
        arrayList.add("2");
        arrayList.add("4");
     
        Collections.sort(arrayList);
       
        System.out.println("ArrayList elements after sorting in ascending order : ");
        for(int i=0; i<arrayList.size(); i++)
          System.out.println(arrayList.get(i));
}   

}
Console：
ArrayList elements after sorting in ascending order :
1
2
3
4
5