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In this quick article, we will discuss what is the use of @Deprecated annotation with examples.
From Oracle Java Doc: A program element annotated @Deprecated is one that programmers are discouraged from using, typically because it is dangerous, or because a better alternative exists. Compilers warn when a deprecated program element is used or overridden in non-deprecated code.
Let me put in a simple way, the @Deprecated annotation is used for informing the compiler that the particular method, class or field is deprecated and it should generate a warning when someone tries to use any of them.
The below diagram shows the internal implementation of @Deprecated annotation for your reference:
Let's demonstrates the usage @Deprecated annotation with examples.
@Deprecated annotation Example
class DeprecatedDemo {
/* @deprecated This field is replaced by
* MAX_NUM field
*/
@Deprecated
int num = 10;
final int MAX_NUM = 10;
/* @deprecated As of release 1.5, replaced
* by myMsg2(String msg, String msg2)
*/
@Deprecated
public void myMsg() {
System.out.println("This method is marked as deprecated");
}
public void myMsg2(String msg, String msg2) {
System.out.println(msg + msg2);
}
public static void main(String a[]) {
DeprecatedDemo obj = new DeprecatedDemo();
obj.myMsg();
System.out.println(obj.num);
}
}
Output:
This method is marked as deprecated
10
In the above example, we have a deprecated method and a deprecated field. As you can see that we have marked both of them using @Deprecated annotation and in the comment section we have used @Deprecated Javadoc tag (for documentation purpose) to inform the programmer what to use in place of it.
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