Java Proficiency: Swap elements of Java ArrayList example

Sunday 10 May 2015

Swap elements of Java ArrayList example

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]

Create ArrayList In Java

Storing Java Object In ArrayList

How To Copy ArrayList To Array

How to Convert Array to ArrayList

How To Shallow Copy Or Clone a ArrayList

Reverse order of all elements of ArrayList

How to add all elements of a list to ArrayList

Swap elements of Java ArrayList example

Remove All Element From Arraylist Example

how To Remove Element of arraylist

How to Remove List From Arraylist

How to get sub list from ArrayList