Java how to reverse an array

How do you reverse an array 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.

How do you reverse an array?

Logic to find reverse of array

  1. Input size and elements in an array. …
  2. Declare another array that will store reversed array elements of original array with same size, say reverse[size] .
  3. Initialize two variables that will keep track of original and reverse array. …
  4. Run loop from size – 1 to 0 in decremented style.

How do you reverse an int array?

2 ways to reverse an Array .

  1. Using For loop and swap the elements till the mid point with time complexity of O(n/2). …
  2. Using built in function (Collections.reverse()) private static void reverseArrayUsingBuiltInFun() { int[] array = new int[] { 1, 2, 3, 4, 5, 6 }; Collections.

How do you reverse an array order in reverse?

The JavaScript array reverse() method changes the sequence of elements of the given array and returns the reverse sequence. In other words, the arrays last element becomes first and the first element becomes the last. This method also made the changes in the original array.

How do you reverse an array without using another array?

Steps to Reverse an Array in C

  1. Initialize an array with values.
  2. Set i=0 for pointing 1st element and j= length – 1 for pointing the last element in the array.
  3. Run while loop with the condition i < j.
  4. Inside loop swap ith element with the jth element in the array.
  5. Increment i and Decrement j.
  6. End Loop.
See also:  How to check if an element is in an array java

How do you reverse an array in CPP?

Reverse Array in C++

Make a variable say temp of same type. Place first element in the temp, then last element in the first, then temp in the last and continue to reverse the array and print the reversed array on the screen as shown here in the following program.

How do you reverse print an array?

Program to print the elements of an array in reverse order

  1. STEP 1: START.
  2. STEP 2: INITIALIZE arr[] = {1, 2, 3, 4, 5}
  3. STEP 3: PRINT “Original Array:”
  4. STEP 4: REPEAT STEP 5 for(i=0; i<arr.length ; i++)
  5. STEP 5: PRINT arr[i]
  6. STEP 6: PRINT “Array in reverse order”
  7. STEP 7: REPEAT STEP 8 for(i= arr.length-1; i>=0; i–)
  8. STEP 8: PRINT a[i]

How do I reverse an array order in C++?

Algorithm to reverse an array

  1. First of all take number of elements as input from user. Let it be N.
  2. Then ask user to enter N numbers and store it in an array(lets call it inputArray).
  3. Declare another array of size equal to input array.
  4. Using a for loop, copy elements from inputArray to reverseArray in reverse order.

How do you reverse an int array in Java?

For example, you can reverse an array by converting an array to ArrayList and then use this code to reverse the ArrayList. You can also use the Apache Commons ArrayUtils. reverse() method to reverse an array in Java. This method is overloaded to reverse byte, short, long, int, float, double, and String array.

What is reverse array?

C program to reverse an array: This program reverses the array elements. For example, if ‘A’ is an array of integers with three elements such that. A[0] = 1, A[1] = 2, A[2] = 3. Then after reversing, the array will be.

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