Java Tutorial

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Java Loops

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Java Programs

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Java Sorting

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Java OOPs Concepts

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Java Strings

Java Strings Java String Methods StringBuilder in Java StringBuffer in Java Java Regular Expressions StringBuffer vs StringBuilder String vs StringBuffer String vs StringBuilder String Manipulation in Java Java String Concatenation How to Reverse a String in Java String Array in Java How to Compare Two Strings in Java How to Concatenate Two Strings in Java Why String in Immutable in Java java.lang.NumberFormatException for Input String String Pool in Java Java Generate Random String How to take String Input in Java Java String Interview Questions

Java Exceptions

Exception Handling in Java Java try catch Java throw Java throws Difference between throw and throws Java finally Java Custom Exception Java Exception Propagation

Garbage Collection

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Multithreading

Multithreading in Java Process and Thread in Java Basic Terms in Multithreading Java Thread creation Thread Scheduler in Java Java Thread class DeadLock in Java

Java IO

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Networking

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AWT

Java AWT

Swing

Swing in Java

Java Collections

Collections in Java Java List Interface ArrayList in Java LinkedList in Java Vector in Java Stack in Java ArrayList vs LinkedList in Java ArrayList vs Vector in Java Java Set Interface HashSet in Java LinkedHashSet in Java TreeSet in Java Java Queue Interface PriorityQueue in Java ArrayDeque in Java Java Map Interface HashMap in Java LinkedHashMap in Java TreeMap in Java Dictionary in Java Hashtable in Java Properties in Java Collections class in Java Java Comparable Java Comparator Comparable vs Comparator in Java

Java Generics

Generics in Java

Java Annotations

Annotations in Java

Java JDBC

Java JDBC Tutorial

Java Differences

Java vs JavaScript Python vs Java Kotlin vs Java Java vs C++ C# vs Java Static vs Non-static in Java C vs Java int vs Integer in Java Stack vs Heap in Java Java Array vs ArrayList

How to

How to run Java program How to set path in Java How to check the Java version in cmd How to install Java in Windows 10 How to run Java program in cmd How to call a method in Java How to sort an array in Java How to iterate HashMap in Java How to write Java program How to create an array in Java How to create a package in Java How to generate random numbers in Java How to input String in Java How to create thread in Java How to find length of String in Java How to sort a string in Java How to use scanner in Java How to achieve multiple inheritance in Java How to run Java program in Eclipse How to call a function in Java How to create array of objects in Java How to create custom exception in Java How to achieve abstraction in Java How to call static method in Java

Java 8 Features

Java 8 Features Lambda Expressions in Java Functional Interface in Java Streams in Java Java Base64 Encoding and Decoding Parallel Arrays Sort in Java

Java 9 Features

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Java Servlet Tutorial

Java Servlets Tutorial

Java JSP Tutorial

Java JSP Tutorial

Hibernate Tutorial

Hibernate Tutorial

Spring Tutorial

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Spring MVC Tutorial

Jenkins Tutorial

Jenkins Tutorial

Java Math Methods

Math.abs() Math.acos() Math.addExact() Math.asin() Math.atan () Math.atan2() Math.cbrt() Math.ceil() Math.copysign() Math.cos() Math.cosh() Math.decrementExact() Math.exp() Math.expm1() Math.floor() Math.floorDiv() Math.floorMod() Math.getExponent() Math.hypot() Math.IEEEremainder() Math.incrementExact() Math.log() Math.log10() Math.log1p() Math.max() Math.min() Math.multiplyExact() Math.multiplyFull() Math.negateExact() Math.nextAfter() Math.nextDown() Math.nextUp() Math.pow() Math.random() Math.rint() Math.round() Math.scalb() Math.signum() Math.sin() Math.sinh() Math.sqrt() Math.subtractExact() Math.tan() Math.tanh() Math.toDegrees() Math.toIntExact() Math.toRadians() Math.ulp()

Java String Methods

toCharArray() copyValueOf() endsWith() equals() equalsIgnoreCase() format() getBytes() getChars() hashCode() indexOf() intern() isEmpty() join() lastIndexOf() length() replace() replaceAll() replaceFirst() split() startsWith() subSequence() substring() toLowerCase() toUpperCase() trim() valueOf()

Java Conversion

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Misc

Functional Interfaces in Java Singleton class in Java Awesome explanation of Strings in Java Object class in Java Static class in Java All the important string methods in Java String Handling Method in Java What are Array strings in Java Advantages and Disadvantages of Strings in Java Big Decimal class in Java Class definition in Java Char and String differences in Java Difference between String, StringBuffer and StringBuilder in java Replace character in string Java String Coding Interview Questions in Java What is String in Java? String isnullorempty in Java String Matches in Java Trim Method in String Java Bean class in Java Libraries in Java Arithmetic Operations on String in Java Convert Char array to string in java Check whether Java is installed or not How to calculate time difference in Java How to stop execution after a certain time in Java Jagged Array in Java Java ArraylistRemove() Time Complexity Java Swing Time Picker Zigzag Array in Java

ArrayList VS Linked List

ArrayList VS Linked List

Both the ArrayList and LinkedList implements the List interface, and they have some differences as well as some similarities between them. The internal working and performance of both vary significantly.

Let’s see both the differences and similarities between ArrayList and LinkedList.

  LinkedList   ArrayList
Elements in the LinkedList are known as nodes, where each node consists of three parts -(1)reference to the previous element, (2)the actual value of the elements and (3) the address to the next element. In the ArrayList element is associated with the index. Because ArrayList is an index based data structure.
We can use LinkedList as ArrayList, Stack, Queue, Singly LinkedList and Doubly LinkedList,  once it is defined. We are unable to use ArrayList as a Stack or Queue.
It requires more memory if we compare it to the ArrayList. Because each node in the LinkedList holds data and reference to the previous and next element in the list. On the other hand, ArrayList requires less memory as compared to LinkedList. Because it holds only actual data and it’s index value.
Inserting and removing an element from the LinkedList is faster than the ArrayList. Because the shifting of the elements is not required after each insertion and deletion, in LinkedList, only the reference of previous and next elements are to be changed. Space and Time Complexity of LinkedList is O(n). Inserting and removing an element in the middle of the ArrayList is very slow. Because after every insertion or deletion, values in the ArrayList need to be shifted. Space and Time Complexity of Arraylist is O(1).
The elements in the LinkedList cannot be accessed randomly. We need to traverse from start to end to reach a particular element. In the ArrayList, the elements can be accessed randomly.
LinkedList is suitable to use for the insertion and deletion of the element than the retrieval. ArrayList is suitable to use more likely for the retrieval of the values than insertion and deletion.

Similarities between LinkedList And ArrayList:

  • LinkedList and ArrayList, both implements the List Interface.
  • Both are Cloneable and Serializable.
  • Both are non-synchronised.

Example code for LinkedList:

import java.util.*; 
 public class LinkedList1 { 
  public static void main (String args []) { 
   LinkedList<String> al=new LinkedList<String> (); 
   al.add ("java"); 
   al.add ("python"); 
   al.add ("angular");  
   al.add ("mongo db"); 
   al.addFirst ("R");
   Iterator<String> itr=ar.iterator (); 
   while (itr.hasNext ()){ 
    System.out.println (itr.next ()); 
   }   }  } 

Output:

R
java
python
angular
mongo db 

Example code for ArrayList:

import java.util.ArrayList;
  public class Arraylist {
         public static void main(String[] args) 
         {
                // we will see how to add elements 
                ArrayList al=new ArrayList();
                Object cloneList;
                al.add("Android");
                al.add("Java"); 
                al.add("Arrays"); 
                System.out.println("Size of arraylist:"+ al.size());//It will show the size               of the array
                System.out.println("Content of al:"+al);//It will show the contents of the array
                al.remove("Java");//It will remove java from the list
                System.out.println("Size of arraylist after deletion:"+al.size()); 
                System.out.println("Content of al:"+al);//prints content after deletion
                cloneList=al.clone();//It will clone the present element in the list
                System.out.println("Elements in the cloned list are:"+cloneList); 
                al.clear();//It will clear the ArrayList
                System.out.println("Arraylist after clear:"+al); 
         }
  }  

Output:

Size of arraylist:3
Content of al:[Android, Java, Arrays]
Size of arraylist after deletion:2
Content of al:[Android, Arrays]
Elements in the cloned list are:[Android, Arrays]
Arraylist after clear:[]  

ArrayList VS Vector

Both the ArrayList and Vector implements the List Interface. Both provide simple methods to store and get the object. But they are different in many aspects.

ArrayList Vector
ArrayList is introduced in JDK 1.2 release, so it is not a legacy class. Vector is a legacy class, i.e., it came along with the first version of JDK
To traverse the elements, ArrayList uses iterator interface. Vector uses the Enumeration interface. However, we can also use the Iterator interface to traverse the elements.
ArrayList is non-synchronized, that makes it fast. Vector is slow because it is synchronized. In a multithreading environment, it keeps the other threads in the runnable or non-runnable state until the current thread releases the lock over the object.
If there is no need for the thread-safe operation, ArrayList is a better choice as it gives better performance because of the concurrent processes. If there is a need to perform a thread-safe operation, Vector is the best choice.
Size of the ArrayList grows by half of its size when resized. Size of the Vector increases by double its size by default when resized.
ArrayList is fail-fast due to the iterator. If we modify the ArrayList structure, the iterator will throw ConcurrentModificationException error. But if we modify the vector over enumeration, it does not fail because iterator is fail-fast and enumeration is not.

Sample code to demonstrate the difference in fail-fast behavior of ArrayList and Vector:

import java.util.*;
 class FailFastDemo {
        public static void main(String[] args)
     {
         //Initializing vector and storing the elements as array
         Vector<String> vector = new Vector<>(Arrays.asList("Java","Oracle","Spring"));
         //Using Enumeration for traversing
         Enumeration<String> vectorEnum = vector.elements(); 
         //Modifying the structure of vector
         while(vectorEnum.hasMoreElements()) {
             String value = vectorEnum.nextElement();
             if("Spring".equals(value)) {
                 vector.add("Hibernate");
             }
             //printing the elements after modification 
             System.out.println(value);
         }
         System.out.println("----------------");
         //Initializing ArrayList
         ArrayList<String> list = new ArrayList<>(Arrays.asList("Java","Oracle","Spring"));
         //Initializing iterator for traversing 
         Iterator<String> listItr = list.iterator();
         //modifying the ArrayList
         while(listItr.hasNext()) {
             String value = listItr.next();
             if("Oracle".equals(value)) {
                 list.add("SQL"); 
             }
             //printing the values
             System.out.println(value);
         }
     }
 } 

Output:

Java
Oracle
Spring
Hibernate
----------------
Java
Oracle 
 Exception in thread "main" java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
        at java.util.ArrayList$Itr.next(Unknown Source)
        at StackJava.main(StackJava.java:33) 



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