This question already has answers here:
How to declare or mark a Java method as deprecated?
(6 answers)
Closed 8 years ago.
I have a method in one of my classes that I don't want it to be used any more. Basically it breaks encapsulation, and I now have better methods I want to be used instead.
What's the best practice for signaling that a method is deprecated?
Add an #Deprecated annotation to that method and tell witch other classes to use in javadoc.
Mark using Deprecated annotation.
Related
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Marker Interfaces in Java?
(10 answers)
Closed 3 years ago.
I just need some clarifications regarding marker interface in java. I have read that its an empty interface in java. I just want to know why and where we need to use this. Can anyone please help.
Shortly said, it is used to mark (or annotate) types with some information that the JVM compiler will use. For instance, the Serializable is a marker interfaces that a type must implement if it needs to have its state persisted (serialized and deserialized).
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What is the meaning of "this" in Java?
(22 answers)
Closed 5 years ago.
I saw multiple use of the keyword this in advanced java programs and in android java files. Can anybody please explain to me the use of this? So I can understand the programming better.
As said by Oracle's Java documentation
:
Within an instance method or a constructor, this is a reference to the current object — the object whose method or constructor is being called. You can refer to any member of the current object from within an instance method or a constructor by using this.
I would check out the documentation as the this keyword is used often in programming.
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What is Implicit constructors on Java
(2 answers)
Closed 7 years ago.
In what situation we implement the explicit constructors in java program and when we doesn't need to implement explicit constructors.
This article explains the full story. In short: you need explicit constructors if you want to pass parameters to this constructor. If you do not need this, you can either provide a "parameterless" constructor ( public Foo() {} ), or you do nothing, in which case the system will create an empty one for you in the background.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
What’s “#Override” there for in java?
Since Java 1.5 this annotation was incorporated to the language to be used on methods that overwrite a superclass methods.
Now, what changes in a method that uses this annotation to one that doesn't use it? Is this just convention?
Assuming, obviously, that both be methods that overwrite a method from its superclass...
#Override creates a compile-time check that a method is being overridden.
This is very useful to make sure you do not have a silly signature issue when trying to override
It not only makes the compiler check but also documents the
developer's intention.
if you override a method but don't use it anywhere from the type itself, someone coming to the code later may know the purpose. The annotation explains its purpose.
A good IDE will helpfully flag any method that overrides a method without #Override, so the combination of the two will help ensure that you're doing what you're trying to.
it also improves readability
This question already has answers here:
Modify a class definition's annotation string parameter at runtime
(7 answers)
Closed 6 years ago.
Below is the annotation.
#Before(value="execution(* class.method(**)")
Can i change the value of single value annotation using java reflection?
Please suggest.
The description of what you are looking for can be found here. But be wary about using such approach, some of the caveats of it are also described.
Also, the retention policy of the annotation has to be runtime, for this.
The link in the comment to your question leads to a post that looks like something you are asking about, but the difference is that it is about a JPA/Hibernate annotation where in the run-time you get a proxy class to your class.