Polymorphism —or an object's ability to execute specialized actions based on its type—is what makes Java code flexible. Many design patterns created by the Gang Of Four rely on some form of polymorphism, including the Command pattern . In this article, you will learn the basics of Java polymorphism and how to use it in your programs.

Things to know about Java polymorphism

• Polymorphism and Java inheritance
• Why polymorphism is important
• Polymorphism in method overriding
• Polymorphism with the core Java classes
• Polymorphic method calls and casting
• Reserved keywords and polymorphism
• Common mistakes with polymorphism
• What to remember about polymorphism

Polymorphism and Java inheritance

We will focus on the relationship between polymorphism and Java inheritance . The main thing to keep in mind is that polymorphism requires an inheritance or an interface implementation. You can see this in the example below, featuring Duke and Juggy:

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Apple has released a beta version of Xcode 16, an update to the integrated development environment (IDE) for Apple platforms that features AI-powered predictive code completion. Accommodations for the Swift language and the planned Swift 6 language release also are highlighted.

The Xcode 16 beta was made available June 10 on the Apple Developer website . Predictive code completion is powered by a machine learning model specifically trained for Swift and Apple SDKs, according to release notes .

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Databricks is getting ready to offer more support to enterprises building generative AI applications, with the addition of new Mosaic AI capabilities, it said Wednesday.

The new features, previewed at the data lakehouse provider’s ongoing Data + AI Summit, seek to simplify the training and management of generative AI applications. They join a suite of others built on its acquisition of large language model (LLM) and model-training software provider MosaicML for $1.3 billion a year ago.

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Oracle is connecting its cloud to Google’s to offer Google customers high-speed access to database services. The move comes just nine months after it struck a similar deal with Microsoft to offer its database services on Azure. Separately, Microsoft is extending its Azure platform into Oracle’s cloud to give OpenAI access to more computing capacity on which to train its models.

“What started as a simple interconnect is becoming a more defined multicloud strategy for Oracle. The announcement is the beginning of a new trend—cloud providers are willing to work together to serve the needs of shared customers,” said Dave McCarthy, Research Vice President at IDC.

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Just days after rival data lakehouse provider Snowflake said that it would open up the source code to its Polaris Catalog, Databricks is open sourcing its Unity Catalog offering.

Databricks’ Unity Catalog, which was made generally available in June 2022 and later updated with Okera’s capabilities , used to be a closed-sourced unified governance offering that provided centralized access control, auditing, lineage, and data discovery capabilities across Databricks workspaces.

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Java’s sun.misc.Unsafe class has been in use since 2002. It provides essential low-level methods that framework developers use to deliver otherwise unobtainable features and performance. Unfortunately, Unsafe also has long-standing problems related to JVM maintainability. And, as the name implies, it isn't exactly safe to use. A newer JEP proposes to remove sun.misc.Unsafe's memory access methods in a future Java release. But what will replace them?

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Over the last decade or so, a slew of Rust web frameworks have appeared, each built with slightly different users and feature needs in mind. All of them benefit from Rust's type safety, memory safety , speed, and correctness.

This article is a quick look at five of the most popular Rust web frameworks: Actix Web, Rocket, Warp, Axum, and Poem. All of them provide common elements for web services: routing, request handling, multiple response types, and middleware. Note that these frameworks do not provide templating, which is typically handled by separate crates.

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Značky: #Rozne, #Rust

In a June 10 keynote presentation at Apple’s World Wide Developers Conference, Ted Kremenek, Apple director of languages and runtimes, argued that Swift is the best programming language to replace C++ .

Swift was introduced by Apple in 2014 as the successor to Objective-C, and Kremenek believes it will overtake C++ as well. “Swift’s safety, speed, and approachability, combined with built-in C and C++ interoperability, mean Swift is the best choice to succeed C++,” Kremenek said.

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In this tutorial, you will learn how to write expressions for your Java programs. In many cases, you'll use operators to write your Java expressions, and there are many operator types to know how to use. I'll briefly introduce Java's operator types, including the additive, bitwise, logical, conditional, shift, and equality types and their operands. You'll also learn about operator overloading and operator precedence, and you'll see a demonstration of primitive-type conversion. I'll conclude with a small Java program that you can use to practice primitive-type conversions on your own.

What you'll learn in this Java tutorial

• What is a Java expression?
• How to write simple expressions
• How to write compound expressions
• About Java operators and operands
• All the operator types in Java, with examples
• About operator precedence and associativity
• How to work with primitive-type conversions

What is a Java expression?

Expressions are combinations of literals, method calls, variable names, and operators. Java applications evaluate expressions. Evaluating an expression produces a new value that can be stored in a variable, used to make a decision, and more.

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Značky: #Java, #Rozne