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Java Developers Desk: Annotations |
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| @Inherited tag by an example:
Example:
Lets first, define the annotation:
@Inherited
public @interface ParentObjectDemo {
boolean isInherited() default true;
String showSomething() default “Show
anything?”;
}
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Now, annotate the class with our
annotation:
| @ParentObjectDemo
public Class ChildObjectDemo {
}
The above example shows that you do not
need to define the interface methods inside
the implemented class. The @Inherited tag
automatically inherits the methods for you.
Suppose you define the implementing class in
the old-fashioned-java-style then let us see
the effect of doing this:
public class ChildObjectDemo implements
ParentObjectDemo {
public boolean isInherited() {
return false;
}
public String showSomething() {
return “”;
}
public boolean equals(Object obj) {
return false;
}
public int hashCode() {
return 0;
}
public String toString() {
return “”;
}
public Class annotationType() {
return null;
}} |
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Have you seen the difference? You have to
implement all the methods of the parent
interface. You will have to implement the
equals(), toString(), and the hashCode()
methods of the Object class and also the
annotation type method of the
java.lang.annotation.Annotation class. You will
also have to include all these methods in your
class regardless of whether you are
implementing all these methods or not
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Jan 2008 | Java Jazz Up | 12 |
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