More than 3000 questions in repository. There are more than 900 unanswered questions. Click here and help us by providing the answer. Have a video suggestion. Click Correct / Improve and please let us know.
Q211. What are few of the Annotations pre defined by Java?
Ans. @Deprecated annotation indicates that the marked element is deprecated and should no longer be used. The compiler generates a warning whenever a program uses a method, class, or field with the @Deprecated annotation.
@Override annotation informs the compiler that the element is meant to override an element declared in a superclass.
@SuppressWarnings annotation tells the compiler to suppress specific warnings that it would otherwise generate.
@SafeVarargs annotation, when applied to a method or constructor, asserts that the code does not perform potentially unsafe operations on its varargsparameter. When this annotation type is used, unchecked warnings relating to varargs usage are suppressed.
@FunctionalInterface annotation, introduced in Java SE 8, indicates that the type declaration is intended to be a functional interface, as defined by the Java Language Specification.
Help us improve. Please let us know the company, where you were asked this question :
Ans. @Retention annotation specifies how the marked annotation is stored:
@Documented annotation indicates that whenever the specified annotation is used those elements should be documented using the Javadoc tool. (By default, annotations are not included in Javadoc.)
@Target annotation marks another annotation to restrict what kind of Java elements the annotation can be applied to.
@Inherited annotation indicates that the annotation type can be inherited from the super class. (This is not true by default.) When the user queries the annotation type and the class has no annotation for this type, the class' superclass is queried for the annotation type. This annotation applies only to class declarations.
@Repeatable annotation, introduced in Java SE 8, indicates that the marked annotation can be applied more than once to the same declaration or type use. For more information, see Repeating Annotations.
Help us improve. Please let us know the company, where you were asked this question :
Ans. Only declaring variables as final makes them immutable. Making objects final means that the object handler cannot be used to target some other object but the object is still mutable.
Help us improve. Please let us know the company, where you were asked this question :
Static methods belong to the class and not the objects. They belong to the class and hence doesn't fit properly for the polymorphic behavior.
A static method is not associated with any instance of a class so the concept of overriding for runtime polymorphism using static methods is not applicable.
Help us improve. Please let us know the company, where you were asked this question :
Ans. A wrapper class is any class which "wraps" or "encapsulates" the functionality of another class or component. A Wrapper Class that wraps or encapsulates the primitive data type is called Primitive Wrapper Class.
Help us improve. Please let us know the company, where you were asked this question :
Ans. Adapter object has a different input than the real subject whereas Proxy object has the same input as the real subject. Proxy object is such that it should be placed as it is in place of the real subject.
Help us improve. Please let us know the company, where you were asked this question :
Ans. The Difference between these patterns in only the intent. Adapter is used because the objects in current form cannot communicate where as in Facade , though the objects can communicate , A Facade object is placed between the client and subject to simplify the interface.
Help us improve. Please let us know the company, where you were asked this question :
More than 3000 questions in repository.
Discuss 
java java8 annotations pre defined annotations
Asked in 1 Companies 
basic 
frequent
Try 1 Question(s) Test
Very Frequently asked.Favorite question in Walk in drive for many Indian service companies.
Sample Code for final class
Which of the following is false for final ?
