How do you iterate in reverse order?

How do you iterate in reverse order?

We can iterate the list in reverse order in two ways:

  1. Using List. listIterator() and Using for loop method.
  2. Using IntStream range(int startInclusive, int endExclusive).

How do you reverse a iterator in Java?

Apache Common provides ReverseListIterator that we can use to iterate list in reverse order. The first call to next() will return the last element from the list, the next call to next() will return the previous element, and so on. hasNext() method checks if there is another element.

How do you reverse the elements of the collection in TreeSet?

To sort TreeSet in descending order, use the descendingSet() method in Java. The descendingSet() method is used to return a reverse order view of the elements contained in this set.

How do you iterate over a sequence in reverse order using built-in function?

But Python does have a built-in reversed function. If you wrap range() inside reversed() , then you can print the integers in reverse order. range() makes it possible to iterate over a decrementing sequence of numbers, whereas reversed() is generally used to loop over a sequence in reverse order.

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 can I reverse a list in Java without using any function?

Example to reverse string in Java by using static method

  1. import java.util.Scanner;
  2. public class ReverseStringExample3.
  3. {
  4. public static void main(String[] arg)
  5. {
  6. ReverseStringExample3 rev=new ReverseStringExample3();
  7. Scanner sc=new Scanner(;
  8. System.out.print(“Enter a string : “);

How do you traverse a TreeSet in reverse order?

The descendingSet() method of java. util. TreeSet class is used to return a reverse order view of the elements contained in this set. The descending set is backed by this set, so changes to the set are reflected in the descending set, and vice-versa.

Which slice operation will reverse the list?

reverse() method. Using the “ [::-1] ” list slicing trick to create a reversed copy. Creating a reverse iterator with the reversed() built-in function.

How do I print an array in reverse order?

How to print the elements in a reverse order from an array in C?

  1. Step1 − Declare an array of size 5.
  2. Step 2 − Enter the 5 elements in memory using for loop.
  3. Step 3 − Display elements in reverse order.
  4. By decrementing for loop.

Is there a reverse function in Java?

2. String class in Java does not have reverse() method, however StringBuilder class has built in reverse() method.

What is forEachRemaining in Java?

The forEachRemaining() method of Java Interface Spliterator is used to performs the given action for each remaining element sequentially in the current thread until all elements have been processed or the action throws an exception.

How do you sort a map in reverse order in Java?

  1. // Generic method to sort map in Java by the reverse ordering of its keys. public static TreeMap sortByKeys(Map map) {
  2. TreeMap treeMap = Maps. newTreeMap( (Comparator) Ordering. natural(). reverse());
  3. treeMap. putAll(map);
  4. return treeMap; }

How do you print a list in reverse order from last to the first item using while and for in loops?

“How to print a list in reverse order (from last to first item) using while and for in loops.” Code Answer

  1. >>> a = [“foo”, “bar”, “baz”]
  2. >>> for i in reversed(a):
  3. … print(i)
  4. or.
  5. >>> for i, e in reversed(list(enumerate(a))):