We can trade two components of Array List utilizing Collections.swap() strategy. This technique acknowledges three contentions. The primary contention is the ArrayList and the other two contentions are the files of the components. This technique brings nothing back.

Syntax:

public static void swap(List list, int a, int b);

Parameters

• list: An ArrayList or any List implementing class in which elements are swapped
• a: index of the first element
• b: index of the second element

Exception: It tosses IndexOutOfBoundsException if the record of Array List is under 0 or more noteworthy than the size of the ArrayList.

Example 1

// Java program to swap two elements in an ArrayList

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

public class GFG {

	public static void main(String a[])
	{

		// Create the Array List
		ArrayList ArrList = new ArrayList();

		// add the values in Array List
		ArrList.add("Item 1");
		ArrList.add("Item 2");
		ArrList.add("Item 3");
		ArrList.add("Item 4");
		ArrList.add("Item 5");

		// display Array List before swap
		System.out.println("Before Swap the ArrayList ");
		System.out.println(ArrList);

		// Swapping the elements at 1 and 2 indeces
		Collections.swap(ArrList, 1, 2);

		// display Array List after swap
		System.out.println("After Swap the ArrayList");
		System.out.println(ArrList);
	}
}

Output:

Before Swap the ArrayList 
[Item 1, Item 2, Item 3, Item 4, Item 5]
After Swap the ArrayList
[Item 1, Item 3, Item 2, Item 4, Item 5]

Example 2

// Java program to swap two elements in an ArrayList

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

public class GFG {

	public static void main(String a[]) throws Exception
	{

		// Create the Array List
		ArrayList ArrList = new ArrayList();

		// add the values in Array List
		ArrList.add("Item 1");
		ArrList.add("Item 2");
		ArrList.add("Item 3");
		ArrList.add("Item 4");
		ArrList.add("Item 5");

		// display Array List before swap
		System.out.println("Before Swap the ArrayList ");
		System.out.println(ArrList);

		// Swapping the elements at -1 and 2 indeces
		// Throws IndexOutOfBounds Exception
		Collections.swap(ArrList, -1, 2);
	}
}

Output:

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index -1 out of bounds for length 5
    at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
    at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
    at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
    at java.base/java.util.Objects.checkIndex(Objects.java:372)
    at java.base/java.util.ArrayList.get(ArrayList.java:458)
    at java.base/java.util.Collections.swap(Collections.java:501)
    at GFG.main(GFG.java:27)