What are the functions of java annotations

Explanation

Comments are metadata, which is the metadata of the source code.

Comments provide a formal way to add information to the code so that the data can be used more easily later.

Annotation is a special modifier applied to class, method, parameter, variable, structure and package declarations. It is the tool chosen by the JSR-175 standard to describe metadata.

Function

1. Generate files.

2. Track code dependencies, implement alternative configuration file functions, and reduce configuration. For example, some annotations in Spring.

3. Perform format checks during compilation, such as @Override, etc.

4. Every time you create categories and interfaces that describe properties, including repetitive work, you can consider using annotations to simplify and automate the process.

Example

@Override
void myMethod() {
......
}

What are the basic data types of java

The basic data types of Java are divided into:

1. Integer type , a data type used to represent integers.

2. Floating point type, a data type used to represent decimals.

3. Character type. The keyword of character type is "char".

4. Boolean type is the basic data type that represents logical values.

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