Monday, August 8, 2011

Sort elements of Java ArrayList

package org.best.example;
   
    /*
      Sort elements of Java ArrayList Example
      This Java Example shows how to sort the elements of java ArrayList object using
      Collections.sort method.
    */
    
    import java.util.ArrayList;
    import java.util.Collections;
    
    public class SortJavaArrayListExample {
    
    public static void main(String[] args) {
    
    //create an ArrayList object
    ArrayList arrayList = new ArrayList();
    
    //Add elements to Arraylist
    arrayList.add("1");
    arrayList.add("3");
    arrayList.add("5");
    arrayList.add("2");
    arrayList.add("4");
    
    /*
      To sort an ArrayList object, use Collection.sort method. This is a
      static method. It sorts an ArrayList object's elements into ascending order.
      */
    Collections.sort(arrayList);
    
    //display elements of 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));
    
    }
    }
    
    /*
    Output would be
    ArrayList elements after sorting in ascending order :
    1
    2
    3
    4
    5
    */

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