Java: Swap two elements in an array list

Last update on May 21 2025 12:47:37 (UTC/GMT +8 hours)

14. Swap ArrayList Elements

Write a Java program that swaps two elements in an array list.

Pictorial Presentation:

Java Collection, ArrayList Exercises: Swap two elements in an array list

Sample Solution:-

Java Code:

import java.util.ArrayList;
import java.util.Collections;
  public class Exercise14 {
  public static void main(String[] args) {
   ArrayList<String> c1= new ArrayList<String>();
          c1.add("Red");
          c1.add("Green");
          c1.add("Black");
          c1.add("White");
          c1.add("Pink");

          System.out.println("Array list before Swap:");
          for(String a: c1){
          System.out.println(a);
        }
          //Swapping 1st(index 0) element with the 3rd(index 2) element
         Collections.swap(c1, 0, 2);
          System.out.println("Array list after swap:");
          for(String b: c1){
          System.out.println(b);
         }
     }
}

Sample Output:

Array list before Swap:                                                
Red                                                                    
Green                                                                  
Black                                                                  
White                                                                  
Pink                                                                   
Array list after swap:                                                 
Black                                                                  
Green                                                                  
Red                                                                    
White                                                                  
Pink

Flowchart:

For more Practice: Solve these Related Problems:

Write a Java program to swap the elements at two specified indices in an ArrayList using Collections.swap().
Write a Java program to implement a manual swap of two elements in an ArrayList without using any built-in swap method.
Write a Java program to swap two elements in an ArrayList using a lambda expression and then verify the swap.
Write a Java program to swap elements and then sort the ArrayList to check if the swap affects the ordering.

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