Description: This example gives how to swap two elements in the ArrayList. The Write a Java program of swap two elements in an array list. What is array length in Java? This method returns nothing. Return the modified array. 2. Write a Java program of swap two elements in an array list. Pictorial Presentation: Java Collection, ArrayList Exercises: Swap two elements in an array list Last update on February 26 2020 08:08:14 (UTC/GMT +8 hours) Java Collection, ArrayList Exercises: Exercise-14 with Solution. We use this attribute with the array name. Develop a method to swap two elements with specified valid indexes I and j: public void swap(int I, int j); This is the method I have to use to swap two of the elements in an array list. Output: a = 10, b = 5 . List is: 1 2 3 4 5 6 Adjacent list is: 2 1 4 3 6 5 Example: How to swap How to swap two elements in an ArrayList in Java: In this post, we will learn how to swap two elements in an ArrayList in Java based on their indices. We can find the array length in Java by using the array attribute length. We can create a java program to sort array elements using bubble sort. If values to be swapped are elements of an array, we can easily write a swap() function by passing the array indices, instead of the actual elements as shown below: Enter the Size of Arrays : 5 Enter the First Array of Elements: 1 5 6 9 8 Enter the Second Array of Elements: 5 6 4 2 8 Before Swapping First Array: 15698 Second Array: 56428 Arrays after Swapping First Array: 56428 Second Array: 15698. Given an array of ints, swap the first and last elements in the array. This method accepts three arguments. Happy Learning We will take the index positions from the user and swap the values in that ArrayList.Collections class provides one static method called swap to swap two elements in a collection and we can use it to swap two values in an ArrayList. Swapping array elements. In Java, the array length is the number of elements that an array can holds. We can swap two elements of Array List using Collections.swap() method. By calling Collections.swap() method you can swap two elements of the ArrayList. In this program, You will learn how to swap adjacent elements of an array in java. Given an array of ints, swap the first and last elements in the array. The array length will be at least 1. Syntax: //swap elements. The first argument is the ArrayList and the other two arguments are the indices of the elements. Default Java API does not have any function to swap array elements. Is there any predefined method for array in Java with which one can directly swap two elements ? But you can swap elements of list with Collections.swap(list, index1, index2); and you can convert array to list and perform swap and then convert list to array. There is no predefined method to obtain the length of an array. Download Run Code.