JAVA EXAMPLE PROGRAMS

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
What is fail-fast in java?
A fail-fast system is nothing but immediately report any failure that is likely to lead to failure. When a problem occurs, a fail-fast system fails immediately. In Java, we can find this behavior with iterators. Incase, you have called iterator on a collection object, and another thread tries to modify the collection object, then concurrent modification exception will be thrown. This is called fail-fast.
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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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