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What is Retention policy in java annotations?


Description:

  • A retention policy determines at what point annotation should be discarded.
  • Java defined 3 types of retention policies through java.lang.annotation.RetentionPolicy enumeration. It has SOURCE, CLASS and RUNTIME.
  • Annotation with retention policy SOURCE will be retained only with source code, and discarded during compile time.
  • Annotation with retention policy CLASS will be retained till compiling the code, and discarded during runtime.
  • Annotation with retention policy RUNTIME will be available to the JVM through runtime.
  • The retention policy will be specified by using java built-in annotation @Retention, and we have to pass the retention policy type.
  • The default retention policy type is CLASS.


Code:
package com.java2novice.annotations;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

@Retention(RetentionPolicy.RUNTIME)
public @interface MySampleAnn {

	String name();
	String desc();
}

class MyAnnTest{
	
	@MySampleAnn(name = "test1", desc = "testing annotations")
	public void myTestMethod(){
		//method implementation
	}
}
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List Of All Annotation (Metadata) Programs:

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  2. What is Retention policy in java annotations?
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  4. How to get all annotations from a class?
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  6. What is marker annotation and how to process it at runtime?
  7. Built-in Java Annotations: @Deprecated example
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  9. Built-in Java Annotations: @SuppressWarnings example
  10. What is single member annotation and how to process it?
Knowledge Centre
Preemptive scheduling Vs Time slicing?
Preemptive scheduling: The highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence.

Time slicing: A task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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