浅谈Java自定义注解相关知识

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.SOURCE)
public @interface Override {
}

public @interface Annotation {
}

javap Annotation.class

D:\002_Project\004_Java_Learn\Annotation\out\production\Annotation>javap Annotation.class
Compiled from "Annotation.java"
public interface Annotation extends java.lang.annotation.Annotation {
}

public interface Annotation extends java.lang.annotation.Annotation {
}

public @interface Annotation {
    public abstract String path();
}

@注解名称(属性名称 = 属性值)

 @Annotation(path = "")
    Student(String name, int age){
    }

int intValue() default 88;

public @interface Annotation {
    
    String stringValue();

    
    int intValue() default 88;

    
    Number enumValue();

    
    Annotation2 annotationValue();

    
    String[] stringArrayValue();
}

public enum Number {
    ONE, TWO, THREE
}

public @interface Annotation2 {
}

public class Student {
    
    @Annotation(
            stringValue = "tom",
            enumValue = Number.ONE,
            annotationValue = @Annotation2,
            stringArrayValue = {"tom", "jerry"})
    Student(String name, int age){
    }

    @SuppressWarnings("all")
    @Override
    public String toString() {
        return super.toString();
    }
}

@Annotation(stringValue = "tom", enumValue = Number.ONE, stringArrayValue = {"tom", "jerry"})

@Target({TYPE, FIELD, METHOD, PARAMETER, CONSTRUCTOR, LOCAL_VARIABLE})
@Retention(RetentionPolicy.SOURCE)
public @interface SuppressWarnings {
    String[] value();
}

 @SuppressWarnings("all")
    @Override
    public String toString() {
        return super.toString();
    }