Core Java Tutorials
“Core Java” is Sun’s term, used to refer to Java SE, the standard edition and a set of related technologies, like the Java VM, CORBA, etc. This is mostly to differentiate from others like Java ME or Java EE. “Core Java” is Oracle’s definition and refers to subset of Java SE technologies.
The Core Java technologies and application programming interfaces (APIs) are the foundation of the Java Platform, Standard Edition (Java SE). They are used in all classes of Java programming, from desktop applications to Java EE applications.
The error “java.lang.IllegalArgumentException: Failed to create folder” in Selenide typically happens when Selenide tries to save screenshots, page sources, or logs, but it cannot create the required directories due to permission issues or incorrect paths.
In-browser UI testing of Angular applications poses several challenges such as asynchronous operations and unpredictable loading screens with spinners or dimmers.
Selenide has an implicit capability to wait for the loading screen to disappear.
As a best practice in Java, POJO classes or Data objects always declare the fields private and expose their access through the getter methods. On rare occasions, we may encounter situations when the member fields are private, and the class does not provide the public accessor methods. For example, the …
Learn to create an immutable or unmodifiable Map using the factory methods added in Java 9 and other versions (Java 8 to Java 21) with examples.
In Java, we can serialize an object to String in different ways such as converting to byte[] and thenBase64 encoded string, XML or JSON. Learn with examples.
Java Stream API provides excellent filtering capability on the elements in the Stream. Sometimes, the stream elements also contain the nested collections; we need to filter those elements in the nested collections. This Java tutorial discusses various approaches with examples to apply filtering on nested collections and collecting the filtered …
Stream mapMulti() is a specialized form of the map() method that transforms each element of a stream into one or multiple output elements or none at all.
In this Java tutorial, we will explore various methods to display the name of the day of the week, catering to different scenarios and requirements. Note that we should be careful of using the int values assigned to weekdays as they differ from method to method. 1. Display the Day …
In this Java date-time tutorial, we’ll explore how to split a date-time range into equal intervals. Conceptually, splitting a date-time range into equal intervals involves dividing the entire range into smaller, equally-sized sub-ranges. In short, we need to determine the start and end points of each sub-range. 1. Splitting Date-time …
Writing a multiline string can be approached differently depending on the version of Java you are using. Since Java 15, text blocks are the preferred method.
In Java, all types of enumerations and iterators (such as Iterator, ListIterator, SplitIterator) are simply navigational cursors and the main purpose of these cursors is to iterate over the elements of the collection. Each cursor has its own features, advantages and disadvantages. In this article, we will walk through these …
Java ArrayList does not publicly expose the length of the backing array, and only the count of the stored elements can be retrieved using its size() method.
The new sequenced collection interfaces allow adding, retrieving, and removing elements at either end of the collection, along with a reverse-ordered view of it.
The Map.computeIfAbsent() method computes the mapped value for a key using a mapping function if the specified key does not exist in the Map or is mapped to a null value. It has been added as the default method in the Map interface in Java 8. 1. When to Use the computeIfAbsent() …
This Java tutorial discusses string templates in Java which is a new addition to the language in Java 21 as a preview feature.