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Sunday, 17 May 2015

How Swap elements of Java LinkedList


import java.util.Collections;
import java.util.LinkedList;

public class SwapElement {
   
    public static void main(String[] args) {
       
        LinkedList<String> linkedList = new LinkedList<String>();
       
        linkedList.add("Mumbai");
        linkedList.add("Delhi");
        linkedList.add("Noida");
        linkedList.add("Gao");
        linkedList.add("Patna");
        //print linkedlist
       
        System.out.println("Before Swap Linklist is = "+linkedList);
       
        /*
        * Swaps the elements at the specified positions in the  specified list.
        *  (If the specified positions are equal, invoking this method leaves the list unchanged.)
        
          Parameters:
          
              list The list in which to swap elements.
              i the index of one element to be swapped.
              j the index of the other element to be swapped.
        
         Throws:
             
              IndexOutOfBoundsException - if either i or j is out
              of range (i < 0 || i >= list.size() || j < 0 || j >= list.size()).
         */

        Collections.swap(linkedList, 2, 4);
       
        System.out.println("After Swap Linklist is = "+linkedList);
       
    }

}

Output:

Before Swap Linklist is = [Mumbai, Delhi, Noida, Gao, Patna]

After Swap Linklist is = [Mumbai, Delhi, Patna, Gao, Noida]



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