How to convert ArrayList to Array and Array to ArrayList in java?5 Sept 2024 | 1 min read Let's see a simple example to convert ArrayList to Array and Array to ArrayList in Java: Output: Converting ArrayList to Array Mango Banana Apple Strawberry Pineapple Converting Array to ArrayList [Mango, Banana, Apple, Strawberry, Pineapple] Next TopicJava Collections Interview Questions |
ArrayList provides constant time for search operation, so it is better to use ArrayList if searching is more frequent operation than add and remove operation. The LinkedList provides constant time for add and remove operations. So it is better to use LinkedList for manipulation. ArrayList has...
1 min read
ArrayList doesn't have length() method, the size() method of ArrayList provides the number of objects available in the collection. Array has length property which provides the length or capacity of the Array. It is the total space allocated during the intialization of the array. import java.util.ArrayList; public class LengthVsSize...
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ArrayList and Vector both implements List interface and maintains insertion order. However, there are many differences between ArrayList and Vector classes that are given below. ArrayListVector 1) ArrayList is not synchronized.Vector is synchronized. 2) ArrayList increments 50% of current array size if the number of elements exceeds from its capacity.Vector...
2 min read
ArrayList provides constant time for search operation, so it is better to use ArrayList if searching is more frequent operation than add and remove operation. The LinkedList provides constant time for add and remove operations. So it is better to use LinkedList for manipulation. ArrayList has...
1 min read
Differences Between Array and ArrayList in Java In Java, array and ArrayLists are well-known data structures. An array is a basic functionality provided by Java, whereas an ArrayList is a class of the Java Collections framework. It belongs to java.util package. Java Array An array is a dynamically...
5 min read
? The reverse method of Collections class can be used to reverse any collection. It is a static method. Let's see the signature of reverse method: public static void reverse(Collection c) Let's see a simple example to reverse ArrayList in Java: public class ReverseArrayList { public static void main(String[] args) { List<String>...
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There are following ways to compare two ArrayList in Java: Java equals() method Java removeAll() method Java retainAll() method Java ArrayList.contains() method Java contentEquals() method Java Stream interface Java equals() method Java equals() method of List interface compares the specified object with the list for equality. It overrides the equals() method of Object class. Syntax boolean...
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? We can use Collections.synchronizedList(List<T>) method to synchronize collections in java. The synchronizedList(List<T>) method is used to return a synchronized (thread-safe) list backed by the specified list. import java.util.*; public class SyncronizeArrayList { public static void main(String args[]) { // Non Synchronized ArrayList List<String> fruitList = new ArrayList<String>(); fruitList.add("Mango"); fruitList.add("Banana"); fruitList.add("Apple"); fruitList.add("Strawberry"); fruitList.add("Pineapple"); // Synchronizing ArrayList in...
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? To remove dupliates from ArrayList, we can convert it into Set. Since Set doesn't contain duplicate elements, it will have only unique elements. Let's see an example to remove duplicates from ArrayList: public class RemoveDuplicateArrayList { public static void main(String[] args) { List<String> l = new ArrayList<String>(); l.add("Mango"); l.add("Banana"); l.add("Mango"); l.add("Apple"); System.out.println(l.toString()); Set<String> s = new...
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? The read-only means unmodifiable view of Collection in which we can not perform any operation which will change the collection through add(), remove() or set() method. We can obtain read-only collection from the existing collection by calling Collections.unmodifiableCollection() method. public class UnmodifiableArrayList { public static void main(String[] args)...
1 min read
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