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Q392. What is rule regarding overriding equals and hashCode method ?
Ans. Lazy fetching is the technique of not loading the child objects when parent objects are loaded. By default Hibernate does not load child objects. One can specify whether to load them or not while doing the association.
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Ans. Transient - In this state, an instance is not associated with any persistence context Persistent - In this state, an instance is associated with a persistence context Detached - This is a state for an instance which was previously associated with a persistence context an has been currently closed dissociated
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Ans. The first annotation will try to map the Class with the Table as of same name as Class whereas the second annotation will specify the Entity name as "EMPLOYEES" and hence will try to map with Table Name "EMPLOYEES".
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Ans. Instead of Saving Parent as well as Child Entities individually , Hibernate provides the option to persist / delete the related entities when the Parent is persisted.
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Ans. Yes but as Hibernate creates the Proxy Classes inherited from the Entity Classes to communicate with Database for lazy initialization. Declaring entity classes as final will prohibit communication with database lazily and hence will be a performance hit.
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Q415. What are the annotations used in Junit with Junit4 ?
Ans. @Test
The Test annotation indicates that the public void method to which it is attached can be run as a test case.
@Before
The Before annotation indicates that this method must be executed before each test in the class, so as to execute some preconditions necessary for the test.
@BeforeClass
The BeforeClass annotation indicates that the static method to which is attached must be executed once and before all tests in the class.
@After
The After annotation indicates that this method gets executed after execution of each test.
@AfterClass
The AfterClass annotation can be used when a method needs to be executed after executing all the tests in a JUnit Test Case class so as to clean-up the set-up.
@Ignores
The Ignore annotation can be used when you want temporarily disable the execution of a specific test.
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Q418. Can we have default method with same name and signature in the derived Interface as the static method in base Interface and vice versa ?
Ans. Yes , we can do that as static methods are not accessible using references and hence cannot lead to conflict. We cannot do inverse as Default methods cannot be overridden with the static methods in derived interface.
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