This article introduces what parameters are in Java, as well as the two types of parameters and the relationship between them. I hope it will be helpful to students learning Java development.
What are the parameters in java?
There are two types of parameters: one is called formal parameters, and the other is called actual parameters.
Formal parameters are separated by commas in parentheses after the method name, for example
public void coverAtoB(String str1, int i2) { ...... }
Of course, sometimes the method has no parameters
public void coverCtoD() { ...... }
str1 is a formal parameter of string type, and i2 is a formal parameter of integer type. If you want to use this method, you must When calling this method, pass it the actual values of these two formal parameters (this is the actual parameter)
Example
coverAtoB("abc", 3);
(Related video tutorial sharing: java video Tutorial)
Formal parameters and actual parameters
1. Formal parameters: They are the parameters named when defining a function or procedure. In layman's terms, it is a mark.
2. Actual parameters: These are the parameters passed to the function or procedure when calling the function or procedure during execution. In layman's terms, it is the actual value.
3. A parameter is a variable variable that changes with different users.
For example, I learned the sin(x) function in middle school. The x here is the formal parameter. When you need to find the sine value of 1, you will use sin(1). The 1 here is It is the relationship between the actual parameters
The relationship between the formal parameters and the actual parameters: the two are combined when calling, usually the actual parameters will be The value is passed to the formal parameter. After the formal parameter is passed, the function process operation is performed, and then some values may be returned to the caller through the parameter or function symbol.
The formal parameter is the parameter list when defining the function, which only defines the parameters. The structure of the table and the names used for reference have no specific content.
The actual parameter is the specific data passed by the calling function.
The above is the detailed content of What are parameters in java?. For more information, please follow other related articles on the PHP Chinese website!

Start Spring using IntelliJIDEAUltimate version...

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...

Java...

How does the Redis caching solution realize the requirements of product ranking list? During the development process, we often need to deal with the requirements of rankings, such as displaying a...

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...

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

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...

How to set the SpringBoot project default run configuration list in Idea using IntelliJ...


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

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Dreamweaver Mac version
Visual web development tools

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

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

WebStorm Mac version
Useful JavaScript development tools