Note 2 Custom Annotation --- --- Technical porter (still Silicon Valley)

• Annotation define a new type of keyword use @interface

• Custom annotation automatically inherited java.lang.annotation.Annotation Interface

• Annotation Annotation definition of member variables in the form of non-parametric methods are declared. Its method name and return value defines the name and type of the member. We called configuration parameters . Type only eight basic data types, String type, Class type, enum type, Annotation type, all of the above types of arrays.

• You can assign initial values ​​when member variables defined Annotation, specifying the initial value of the member variables can use the default keyword

• If only one member of parameters, it is recommended to use a parameter called value
• If a comment contains a defined configuration parameters, you must specify parameter values when in use, unless it has a default value . The format is "parameter name = parameter value", if only one member of the parameter, and name value, you can omit "value ="
• No members defined Annotation called marker; Annotation containing member variables called metadata Annotation

Note: Custom annotations must be accompanied by an information processing flow is meaningful annotations.

@MyAnnotation(value="尚硅谷")
public class MyAnnotationTest {
　　
}

@interface MyAnnotation{
　　String value() default "auguigu"; 
}