1/23/2024 0 Comments Reverse array java![]() ![]() When the for loop is complete, newArray is completely full and is an exact reverse of the array. This is done by starting with the first element of an array and assigning it to the last element of newArray, then taking the second element of our array and assigning it to the second last element of newArray, and so on newArray is filled in backwards. A for loop is used to fill in the newArray and operates over the whole length of the array. ![]() In method reverse, a new array, newArray, is created and is the same size as array, only completely empty. array is declared in main and then a method, reverse, is called. In this example, we wrote a method which reverses an array and returns a new reversed array, based on the array which was passed to it. Method returns a new reversed array, based on the array which was passed to it. ("Reversed array : " + Arrays.toString(reversedArray)) // print reversed array ("Array : " + Arrays.toString(array)) // print array the first element is the same as the last element in the original array, the second is the same as the second from last and so on until the additional array is filled. This option uses an additional array which is filled starting with the last element of the original array in descending order, i.e. ![]() Option 1: Reversing an Array using an Additional ArrayLet us write a simple method to reverse an array using an additional array. For Option 1, an array is reversed using an additional array filled in ascending order from the end of the original array (descending), in Option 2 an in-place reversal is carried out where array elements at the beginning and end are swapped over, in Option 3, the reverse() method from the Collections framework is used to do the reversal, in Option 4, List.add() and List.remove() are used, and finally, in Option 5, recursion is used. How to Reverse an ArrayThere are many ways of reversing an array, and here we consider 5. Even more, reversing an array is a very popular task in Java Juniors interviews. In this case, best practice is to do the reversal and then use the reversed array where necessary in the code. It may be necessary to reverse an array, for example, when the logic of a problem needs to start with the last element. There may be many reasons why a coder may want to reverse an array. Arrays are used frequently in coding and are a way of storing multiple values of the same type in one variable. ![]()
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