Java Relational Operators: Key Rules Every Developer Should Know

·2 views

Relational operators in Java are used to compare two values and always return a boolean result of true or false. They can be applied to all primitive numeric data types, including byte, short, int, long, float, double, and char, but not to boolean values or objects. Strings cannot be compared using relational operators like > or <; instead, developers should use the compareTo() method for ordering or equals() for content comparison. Chaining comparisons such as 10 > 20 > 30 is also invalid in Java, as it results in a compile-time error due to a boolean being compared against an integer. Understanding these rules is considered essential knowledge for Java developers, particularly in technical interviews.

Read the full story at DEV Community

This is an AI-generated summary. ShortSingh links to the original source for the complete article.

Discussion (0)

Leaded Gasoline Was Recognized as Toxic From the Moment It Was Created

A Smithsonian Magazine article revisiting the history of leaded gasoline highlights that its dangers were understood even at the time of its invention. Despite this early awareness, the fuel additive tetraethyl lead was widely adopted and used for decades in vehicles worldwide. The decision to proceed with leaded gas prioritized industrial and commercial interests over known public health risks. The article underscores how scientific evidence of harm was suppressed or ignored by those who stood to profit from the product.

0 comments Read more at Hacker News

ProgrammingHacker News ·

Earendel: The Most Distant Individual Star Ever Observed by Humans

Earendel is a massive star located in the Sunrise Arc galaxy, detected by the Hubble Space Telescope in 2022. It holds the record as the farthest individual star ever observed, situated approximately 28 billion light-years away from Earth. The star was spotted using a phenomenon called gravitational lensing, where a galaxy cluster bent and amplified its light enough to make it visible. NASA's James Webb Space Telescope later confirmed and further studied the star. Earendel existed in the early universe, just 900 million years after the Big Bang.

0 comments Read more at Hacker News

ProgrammingDEV Community ·

Cordless v0.6 Launches CLI-First Terminal Dashboard with QR Pairing and Self-Contained Binary

Cordless, a tool for managing remote terminal and coding-agent sessions on mobile, has released version 0.6 with a redesigned CLI-first approach. Running the app now opens a full-screen terminal dashboard that immediately displays a pairing QR code, eliminating the need to run a separate pairing command. The update ships as a single self-contained binary bundling its own Node.js runtime and node-pty, removing any prior installation requirements. Security has also been tightened, with pairing codes now issued exclusively through an authenticated WebSocket call restricted to loopback connections, making remote device enrollment impossible. The persistent daemon architecture ensures that closing the dashboard never interrupts active sessions or phone connections.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Common jq Pitfalls in Shell Scripts and How to Handle Them

Developers and sysadmins using jq to process JSON in shell scripts often encounter edge cases that work in testing but fail in production. Key issues include improper null handling and unexpected behavior when querying missing or empty fields. Using flags like -r for raw string output and -e to detect null results with exit code 5 can help catch these problems early. Defensive scripting patterns, such as explicit null checks and error exits, are recommended to avoid hard-to-debug production failures. These are not flaws in jq itself but rather subtleties that arise when combining shell scripting with real-world JSON data processing.

0 comments Read more at DEV Community