Linked List in Java
Linked List in Java is a Collection class and it implements the doubly linked list data structure. LinkedList class in Java extends an abstract class...
Category: JAVA API
Array Vs ArrayList in Java
Both Array and ArrayList are very important and frequently used data structures in Java. The main difference between Array Vs ArrayList is that Array is...
Remove Element from ArrayList in Java
In this article, we are going to see 3 ways to remove an element from ArrayList in Java that matches a certain condition. 1. Remove...
Filter a List with Stream in Java
To filter a List in java before Java 8 requires iterating through a complete list and needs us to write many lines of code. After...
Java Iterator examples
Here are few Java Iterator examples for your reference. Below are the three ways to iterate a List or Set in Java – iterator.hasNext()iterator.forEachRemaining() methodListIterator 1....
Convert Iterator to Stream – Java 8
There are 2 ways to convert an Iterator to Stream in Java 8 – Use StreamSupport.stream to convert Iterator into a StreamUse StreamSupport.stream with Spliterator parameter 1. Iterator to Stream The Iterator interface has no spliterator() method. We...
Get Current Date and Time – Java 8 Examples
Java provides many useful ways to get current date time, current date, or current time using newly introduced LocalDate, LocalDateTime and ZonedDateTime classes in Java 8 Date/Time API classes. In this article, I will show you how to...
Java 8 forEach Examples
Java 8 has added a new way to iterate over List or Collection, by using the new forEach() method of the new Stream class. You...
Sort an ArrayList of Objects in Java [Examples]
Introduction In the real world, you will come across a situation where you need to sort an ArrayList of POJO. For example - Student, Department,...
How to get file size in java?
In Java, we can determine the size of a file with File, FileChannel, and Files. If you are using Java 7 or greater, it is recommended to you...
How to make a file read only in Java?
As a Java developer, you might have got a requirement to make a file read only in the Java program. When I started programming in...
Interesting Facts About Null In Java [Null Keyword]
Java and Null share an ill-fated bond. Almost every Java developer had troubles with the NullPointerException. In Java, the null variables, references, and collections are...
Java – Check if a String is Empty or Blank
In Java, empty String and blank String are two different concepts. It's always confusing and tricky for Java beginners to check if a String is...
Difference between HashMap and ConcurrentHashMap in Java
Introduction HashMap is a class that is available under traditional Collection and ConcurrentHashMap is a class that is added later under Concurrent Collections. ConcurrentHashMap is...
ExecutorService in Java [Create ThreadPool Examples]
Table Of Content Introduction Java ExecutorService Implementations Creating ExecutorService Creating with Executors Factory Methods Directly create an ExecutorService ExecutorService Usage execute(Runnable) submit(Runnable) submit(Callable) invokeAny() invokeAll()...