When is a Method Reference Not Equivalent to a Lambda Expression?
Method Reference vs Lambda Expression: Exploring the Equivalency of System.out::println
When utilizing a method reference such as System.out::println, the function first evaluates System.out and captures the resulting value in a lambda expression. For instance, the lambda equivalent of this method reference would be:
<code class="java">Consumer<Integer> consumer = System.out::println;</code>
This lambda expression behaves similarly to the code below:
<code class="java">Consumer<Integer> consumer = new Consumer<Integer>() { @Override public void accept(Integer i) { System.out.println(i); } };</code>
However, the method reference System.out::println offers an advantage over the lambda expression as it always evaluates System.out at compile time. In the case of the lambda expression, System.out is evaluated each time the method is invoked.
To ensure an exact equivalent to the method reference, the following code must be used:
<code class="java">PrintStream printStream = Objects.requireNonNull(System.out); Consumer<Integer> consumer = o -> printStream.println(o);</code>
Here, printStream is a variable capturing the System.out value, guaranteeing that any subsequent changes to System.out will not affect this consumer.
The above is the detailed content of When is a Method Reference Not Equivalent to a Lambda Expression?. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Troubleshooting and solutions to the company's security software that causes some applications to not function properly. Many companies will deploy security software in order to ensure internal network security. ...

Field mapping processing in system docking often encounters a difficult problem when performing system docking: how to effectively map the interface fields of system A...

When using MyBatis-Plus or other ORM frameworks for database operations, it is often necessary to construct query conditions based on the attribute name of the entity class. If you manually every time...

Solutions to convert names to numbers to implement sorting In many application scenarios, users may need to sort in groups, especially in one...

Start Spring using IntelliJIDEAUltimate version...

Conversion of Java Objects and Arrays: In-depth discussion of the risks and correct methods of cast type conversion Many Java beginners will encounter the conversion of an object into an array...

Detailed explanation of the design of SKU and SPU tables on e-commerce platforms This article will discuss the database design issues of SKU and SPU in e-commerce platforms, especially how to deal with user-defined sales...

When using TKMyBatis for database queries, how to gracefully get entity class variable names to build query conditions is a common problem. This article will pin...
