Do you know ‘how to reverse a list in Java?’ Have you ever thought what are the processes to reverse a list in Java? Well, if you’re willing to know the process and get help with Java assignments then this article is for you.
But before we start knowing about the methods to reverse a list of Java, let us first try to find out the reverse order meaning. Let us know the process of reversing any sequence from our daily life.
Assume one scenario from our daily life.
Suppose, today in your school, you have your physical education class. In that period, your teacher instructed the whole class to create a queue. But the sequence should be in the descending to ascending order of height. This means the shortest student will be the first in the sequence. And the tallest student will be last in that sequence.
Now, when the principal came there, he instructed me to change the order. Now, the order will be ascending to descending order. This means, that now the tallest boy will be the first in the sequence & the shortest boy will be the last in the sequence.
So, how will you do this thing without making more mess?
You will simply swap the students there. This means that one student from the front of the sequence will replace the same place from the last with one student. In this way, you will reverse the sequence.
Reverse a list Java also follows the same method. but we can’t able to see the swapping of the elements in the list. Along with reversing a list, we can able to reverse a linked list in Java & reverse ArrayList in Java. Also, if you’re aware of array list in Java then it’s important for you to know “How to print an array in Java?” but before we start making those operations, let us first know about the list in Java.
What Is List In Java? Read Below
Java list is a special operational element. It is the same as the data structures storage mechanism. It is quite similar to the array. But it is more robust & flexible than the array. While developing an array, we need to provide the size of the array. Also, there may be a chance of wastage of the space of the array. But in the case of the list, there are no such problems.
In the list, we can able easily insert the elements. We don’t need to declare the size. Just we need to declare the list in Java. Then we can easily insert the elements in the list. It is similar to the stack method. As, in the stack, we can able to insert the elements & pop out the elements. In some way, we can insert the data into the list & remove the data from there.
The list provides a series of operations. These all operations are inbuild functions in Java. it helps to maintain some difficult tasks in the Java programming language. These are the reasons why the list is more useful than the array. Also, the programmers find it helpful to use the list instead of the array. In the list also, we can able to store similar kinds of data. We can’t able to combine the integer & the string values in a single list. Also, a list is like a class. Inside of class, there are many categories.
What Is The Method To Reverse A List Java? Get To Know
Java provides a special operation to reverse a list Java. this is the inbuilt method of Java. This method is completely associated with the Java list. There are some other sub-classes of the list in the Java programming language. There are Linked List & Array List sub-classes in the list. The method that is implemented to reverse a list Java is known as the reverse() method.
The reverse() method applies to all the versions of the list. Using this method, we can able to reverse a linked list in Java. Also, we can able to reverse ArrayList Java. To reverse a list Java, we need to take one list there. Using the list, we are going to reverse the list & print the data. This will help to understand the implementation process. If you also want to know more about multithreading in Java then you can read it here.
What Is The Way To Reverse ArrayList Java?
For using the list in the Java programming language, we need to import a special package. This package is known as the java.util.*. In this package, there will be all operations related to the list of Java.
Now, we have to declare a list that will be an array list. Also, here we need to insert the strings in the list. So, the datatype will be listed there. After that, we need to insert the elements into the list using the add() method. This will add the elements one by one to the list.
After that, we need to use the reverse() method to reverse a list Java. Then we need to print the list.
Example:
import java.util.*;
public class Main{
public static void main(String[] args) {
List<String> CodingZap = new ArrayList<String>(); // Declaring Array List
// Adding Elements To List
CodingZap.add("Java Program"); CodingZap.add("C++ Program"); CodingZap.add("C Program");
Collections.reverse(CodingZap); // Using reverse() Method To Reverse The List
System.out.println("Reverse List: " + CodingZap);}} // Reverse List
Let us try to find out the output from the above code. This will help to understand the reverse a list Java.
Output:
What Is The Way To Reverse A Linked List In Java?
In this case, also, we need to import the same special package. Here, we only need to declare the list that is the linked list category. After that, we need to add the data there. After that, we need to use the reverse() method. it will reverse the same list.
Example:
import java.util.*;
public class Main{
public static void main(String[] args) {
List<String> CodingZap = new LinkedList<String>(); // Declaring Linked List
// Adding Elements To List
CodingZap.add("ZapOne"); CodingZap.add("Hello"); CodingZap.add("Java");
Collections.reverse(CodingZap); // Using reverse() Method To Reverse The List
System.out.println("Reverse List: " + CodingZap); }} // Reverse List
Let us try to find out the output from the above code. This will help to understand the reverse a list Java.
Output:
Conclusion:
As we saw reverse a list Java is a very important topic.
We need to clear the process to reverse a linked list in Java & process to reverse ArrayList Java. This topic will help you a lot in the future. Another topic which will help you a lot in the future to have a sucessfull career in Java is getting knowledge about ways to compare two strings in Java.
It is advisable to first clear the basics of the Java programming language. This will help to understand the topics in better manner.
So, hope you have liked this piece of article. Share your thoughts in the comments section and let us know if we can improve more.
If you are looking for Final Year Java Project Ideas then you can read our article on Java project ideas for final year students.
