JAVA EXAMPLE PROGRAMS

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How to create basic custom annotation?


Description:

  • 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.


Code:
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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Knowledge Centre
Inner class and Anonymous class
Inner class: classes defined in other classes, including those defined in methods are called inner classes. An inner class can have any accessibility including private.

Anonymous class: Anonymous class is a class defined inside a method without a name and is instantiated and declared in the same place and cannot have explicit constructors.
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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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