How to swap two elements in a vector using Java

Problem Description

How to swap two elements in a vector?

Solution

Following example.

import java.util.Collections;
import java.util.Vector;

public class Main {
   public static void main(String[] args) {
      Vector<String> v = new Vector<String>();
      v.add("1");
      v.add("2");
      v.add("3");
      v.add("4");
      v.add("5");
      System.out.println(v);
      Collections.swap(v, 0, 4);
      System.out.println("After swapping");
      System.out.println(v);
   }
}

Result

The above code sample will produce the following result.

1 2 3 4 5 
After swapping
5 2 3 4 1

The following is an another sample example to swap two elements in a vector ?

import java.util.Vector;
import java.util.Collections;
 
public class Demo {
   public static void main(String[] args) {
      Vector v = new Vector();
      v.add("1");
      v.add("2");
      v.add("3");
      v.add("4");
      v.add("5");
      Collections.swap(v,0,4);
      System.out.println("Result after swap Vector contains : " + v);
   }
}

The above code sample will produce the following result.

Result after swap Vector contains : [5, 2, 3, 4, 1]