Readers ask: How To Swap Elements In An Array Java?

How do you swap elements in an array Java?

Example 2

  1. import java.util.*;
  2. public class CollectionsSwapExample2 {
  3. public static void main (String[] args) {
  4. //Create a list with items.
  5. List<Integer> list = Arrays.asList(44, 55, 99, 77, 88, 66);
  6. System.out.println(“List before swapping: “+list);
  7. Collections. swap (list, 2, 5);

How do you swap elements in an array?

The swap function works by taking three arguments:

  1. The array.
  2. The first item whose contents you want to swap.
  3. The second item whose contents you want to swap.

How do you swap two elements in an array list?

How to swap two elements in ArrayList in Java

  1. Swap two elements in arraylist – Collections. swap () Collections. swap () method swaps the elements at the specified positions in the specified list.
  2. Swap two elements in arraylist example. Java program to swap two specified elements in a given list. In this example, we are swapping the elements at position ‘1’ and ‘2’.
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How do you swap two numbers in an array in Java?

Java Program

  1. import java.util.*;
  2. class Swap_With {
  3. public static void main(String[] args) {
  4. int x, y, t;// x and y are to swap.
  5. Scanner sc = new Scanner(;
  6. System.out.println(“Enter the value of X and Y”);
  7. x = sc.nextInt();
  8. y = sc.nextInt();

How do you swap objects in Java?

The swap () method is a static method and therefore you invoke it with the class name as Collections. swap (). The return type of the swap () method is void so it will not return anything.

  1. list — list contains the elements we swap.
  2. a — index of an element to be swapped.
  3. b — index of another element to be swapped.

How do you swap a list?

Use multiple assignment to swap the value at each index in the list.

  1. a_list = [“a”, “b”, “c”]
  2. index1 = a_list. index(“a”)
  3. index2 = a_list. index(“c”)
  4. a_list[index1], a_list[index2] = a_list[index2], a_list[index1]
  5. print(a_list)

How do you swap two arrays?

Write a c program for swapping of two arrays

  1. #include<stdio.h>
  2. int main() {
  3. int a[10],b[10],c[10],i;
  4. printf(“Enter First array ->”);
  5. for (i=0;i<10;i++)
  6. scanf(“%d”,&a[i]);
  7. printf(“nEnter Second array ->”);
  8. for (i=0;i<10;i++)

How do you switch the first and last elements in an array?

Write a Java program to swap the first and last elements of an array and create a new array

  1. import java.util. Arrays;
  2. public class Javaexcercise {
  3. {
  4. int[] array_nums = {10, 20, 30};
  5. System. out.
  6. int x = array_nums[0];
  7. array_nums[0] = array_nums[array_nums. length-1];
  8. array_nums[array_nums. length-1] = x;

How do you swap numbers in C programming?

C Program to swap two numbers without third variable

  1. #include<stdio.h>
  2. int main()
  3. {
  4. int a=10, b=20;
  5. printf(“Before swap a=%d b=%d”,a,b);
  6. a=a+b;//a=30 (10+20)
  7. b=a-b;//b=10 (30-20)
  8. a=a-b;//a=20 (30-10)
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How do you swap elements in an array in C++?

The C++ function std:: array:: swaps () swap contents of the array. This method takes other array as parameter and exchage contents of the both arrays in linear fashion by performing swap operation on induvisual element of array.

How do you reverse an array element in Java?

Answer: There are three methods to reverse an array in Java.

  1. Using a for loop to traverse the array and copy the elements in another array in reverse order.
  2. Using in-place reversal in which the elements are swapped to place them in reverse order.
  3. Using the reverse method of the Collections interface that works on lists.

What are the methods in ArrayList?

Methods of ArrayList

Method Description
<T> T[] toArray(T[] a) It is used to return an array containing all of the elements in this list in the correct order.
Object clone() It is used to return a shallow copy of an ArrayList.
boolean contains( Object o) It returns true if the list contains the specified element


How do you swap two numbers in Java?

Below are the simple steps we follow:

  1. Assign x to a temp variable: temp = x.
  2. Assign y to x: x = y.
  3. Asign temp to y: y = temp.

How do you reverse an array?

Algorithm to reverse an array

  1. Input the number of elements of an array.
  2. Input the array elements.
  3. Traverse the array from the last.
  4. Print all the elements.

How do you swap arrays in C++?

A simple solution is to iterate over elements of both arrays and swap them one by one. A quick solution is to use std:: swap (). It can directly swap arrays if they are of same size.

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