There are two ways to empty an ArrayList – By usingArrayList.clear()method or with the help ofArrayList.removeAll()method. Although both methods do the same task the way they empty the List is quite different. Lets see the below example first then we will see the implementation and differe...
If we just want to clear theArrayList, clear() method will much faster as it only set the reference to each element asnulldoing no additional data manipulation. How to empty and ArrayList in Java? We can useArrayList.clear()orArrayList.removeAll()method to empty an ArrayList. Theclear()met...
In this tutorial, you will learn how to initialize an ArrayList in Java. There are several different ways to do this. Let’s discuss them with examples. 1. Basic (Normal) Initialization One of the ways to initialize anArrayListis to create it first and then add elements later usingadd()m...
Arraylist.ArrayList() Used to build an empty ArrayList. public class Csharpcorner { public static void main(String[] args) { ArrayList cars = new ArrayList(); } } Arraylist. ArrayList<Collection c>() This constructor is used to build an ArrayList initialized with the elements from ...
To convert an ArrayList to an Array, you can usetoArray()method. toArray() Method toArray()method is available injava.utilpackage. toArray()method is used to return a converted Array object which contains all of the elements in the ArrayList. ...
Reverse an ArrayList in Java using Collections.reverse() Method TheCollections.reverse()method is available injava.utilpackage. It is used to reverse the elements of any Collection but here we are talking about ArrayList. Syntax: public static void reverse(Collection c); ...
That's all about how to reverse ArrayList in Java. Though you can always write your method to reverse an ArrayList, it won't be much different than how you reverse an Array in Java, it's always better to use a function from the JDK library. Why? because they are well tested for pro...
Convert a string to ArrayList using Java code. To convert string to ArrayList, we are using asList(), split() and add() methods.
Learn to check if an ArrayList is empty using isEmpty() and size() methods. Note isEmpty() method internally checks the size of the list.
Let's see a simple example to reverse ArrayList in Java: publicclassReverseArrayList { publicstaticvoidmain(String[] args) { List<String> l =newArrayList<String>(); l.add("Mango"); l.add("Banana"); l.add("Mango"); l.add("Apple"); ...