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How to create basic custom annotation?


  • Annotations are created by using @ sign, folled by the keyword interface, and followed by annotation name as shown in the below example.
  • Members can be decleared as shown in the example, it looks like methods. The example defines two members called name and desc. We should not provide implementation for these members.
  • All annotations extends java.lang.annotation.Annotation interface. Annotations cannot include any extends caluse.
  • Below example shows how to use this annotation to method.

package com.java2novice.annotations;

public @interface MySampleAnn {

	String name();
	String desc();

class MyAnnTest{
	@MySampleAnn(name = "test1", desc = "testing annotations")
	public void myTestMethod(){
		//method implementation
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An error is an irrecoverable condition occurring at runtime like out of memory error. These kind of jvm errors cannot be handled at runtime. Exceptions are because of condition failures, which can be handled easily at runtime.
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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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