Java Proficiency: swap arrraylist element

Sunday, 10 May 2015

We Swap List element using swap method of    Collections.

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

public class SwapElement {

    public static void main(String[] args) {
        ArrayList<String> arr = new ArrayList<String>();
        // add element in arraylist
        arr.add("c");
        arr.add("php");
        arr.add("html");
        arr.add("java");
        // print arraylist
        System.out.println("ArrayList Before Swap is = " + arr);

        /*
         * 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(arr, 1, 3);

        System.out.println("ArrayList Before Swap is = " + arr);

    }


}

Output:

ArrayList Before Swap is = [c, php, html, java]

ArrayList Before Swap is = [c, java, html, php]

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