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[VV83] Java 22, Java pain points and fix, Collections and generics, ternary operator, module pattern, Devin poll
? Java 22 release Day ?? WAS THIS WEEK
Features
423: Region Pinning for G1
447: Statements before super(...) (Preview)
454: Foreign Function & Memory API
456: Unnamed Variables & Patterns
457: Class-File API (Preview)
458: Launch Multi-File Source-Code Programs
459: String Templates (Second Preview)
460: Vector API (Seventh Incubator)
461: Stream Gatherers (Preview)
462: Structured Concurrency (Second Preview)
463: Implicitly Declared Classes and Instance Main Methods (Second Preview)
464: Scoped Values (Second Preview)
JDK22 details ?? https://openjdk.org/projects/jdk/22/
Java 22 Launch Stream ?? https://www.youtube.com/live/AjjAZsnRXtE?t=279
#java #java22 #release #day #yihaa
? Java pain points ?? and fix ??
with Active projects in the OpenJDK community
?? Loom: Lightweight concurrency
Pain point fixed: Threads are too expensive, don't scale
Comparison: Go, Elixir
??? ZGC: Sub-millisecond GC pauses
Pain point: GC pauses too long
Comparison: C, Rust
??? Panama: Native code and memory interop SIMD Vector support
Pain point: Using native libraries is too long. Numeric loops are too slow.
Comparison: Python, C
?? Amber: Right-sizing language ceremony
Pain point: Java is too verbose. Java is hard to teach.
Comparison: C#, Kotlin
? Leyden: Faster startup and warmup
Pain point: Java starts up too slowly
Comparison: Go
? Valhalla: Value types and specialized generics
Pain point: Cache misses are too expensive. Generics and primitives don't mix.
Comparison: C, C#
?? Babylon: Foreign programming model interop
Pain point: Using GPUs is too hard
Comparison: LinQ, Julia
#java #projects #openjdk
???JAVA CERTIFICATION QUESTION: Collections and generics
Which data structure among the following lacks the utilization of generics?
* Array
* List
* Map
* Queue
* Set
* Vector
#java #certificationquestion #ocp
Answer:
Arrays do not employ generics.
Unlike other data structures like Set, List, Map, Queue, and Vector, which can utilize generics to enforce type safety and flexibility, arrays in Java are covariant and invariant, meaning they can store elements of any type but do not have built-in type checking at compile-time.
Therefore, arrays can potentially lead to runtime errors if incorrect types are inserted into them.
This lack of type safety is a notable distinction from the other data structures listed.
领英推荐
??? QUOTE
?? REACT quiz: ternary operator
In this component, how do you display whether the user was logged in or not?
render() {
const isLoggedIn = this.state.isLoggedIn;
return (
〈div〉
The user is:
〈/div〉
);
}
* The user is loggedIn ? logged in : not logged in.
* Write a function to check the login status.
* The user is {isLoggedIn = "no"}.
* The user is {isLoggedIn ? "logged in." : "not logged in"}.
#react #quiz #programming
Answer:
You can use a ternary operator or an if/else statement to conditionally render the appropriate message based on the value of isLoggedIn. Here's an example using a ternary operator:
render() {
const isLoggedIn = this.state.isLoggedIn;
return (
〈div〉
The user is: {isLoggedIn ? 'logged in' : 'not logged in'}
〈/div〉
);
}
?? DESIGN PATTERN: The quiz!
The _____ Pattern in JavaScript encapsulates code into self-contained modules, offering private and public members to organize and structure code effectively.
* Marker
* Module
* Proxy
* Twin
#design #pattern #programming #software
Answer: Module
The Module Pattern is a design pattern in JavaScript that enables the encapsulation of code into self-contained modules. It helps organize and structure code by creating private and public members within a module, providing a way to hide implementation details and expose only necessary interfaces.
Key characteristics of the Module Pattern:
Closure: It relies on JavaScript closures to create private and protected members, ensuring that certain variables and functions are not accessible from the outside.
Private Members: Private members are variables and functions within the module that are not exposed to external code.
Public Members: Public members are variables and functions that can be accessed from outside the module, serving as the interface for interacting with the module.
Initialization: A module typically involves an initialization function that sets up the private and public members, and it returns an object or closure that exposes the public interface.
The Module Pattern promotes code organization, reduces global namespace pollution, and provides a way to control access to module members. It is commonly used in JavaScript to create reusable and maintainable code components.
??? POLL: What do you think about Devin?
Devin is an autonomous AI software engineer created by Cognition, capable of handling complex software engineering tasks independently.
What do you think of it? ??
#devin #ai #developer #poll #programming
?? Check this video to have an idea of what some developers think: https://youtu.be/AgyJv2Qelwk
???? DEVIN JOKE
In the heart of a bustling city, amidst the ceaseless flow of pedestrians, sat a lone figure, a software engineer, with a sign that read, "Anyone need a software engineer?" His hopeful eyes scanned the faces passing by, searching for an opportunity amid the indifferent crowds.
But the responses he received were not what he had hoped for. "Nah," muttered one passerby, barely sparing him a glance. "No," echoed another, quickening their pace as they passed. Each rejection chipped away at the engineer's spirit, leaving him feeling increasingly despondent.
Just as he was about to give up hope, a figure approached him, their footsteps purposeful. "I need one," they said, their voice cutting through the noise of the street.
The engineer's heart skipped a beat as he looked up, renewed hope flickering in his eyes. But then came the final blow, delivered with a grave tone and accompanied by a dramatic backdrop of swirling clouds and ominous lighting: "To fix Devin's code."
Devin, the embodiment of advanced artificial intelligence, was notorious among software engineers for the complexity and unpredictability of its code. The engineer's moment of elation swiftly turned to dread as he realized the daunting task that lay ahead.
In this story, the software engineer's plea for a job represents the challenges faced by job seekers in a competitive market, where rejection can be disheartening. The response from the passerby who needs a software engineer reflects the unpredictable nature of opportunities, sometimes appearing when least expected. However, the final twist underscores the reality of the software engineering profession, where even a job offer may come with daunting challenges and responsibilities, symbolized by the task of fixing Devin's intricate code.