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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. Assert works only if assertions ( -ea ) are enabled which is not required for Verify.Assert throws an exception and hence doesn't continue with the test if assert evaluates to false whereas it's not so with Verify.
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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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Q750. 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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Q756. Can a class implement two Interfaces having default method with same name and signature ?
public interface DefaultMethodInterface { default public void defaultMethod(){ System.out.println("DefaultMethodInterface"); } }
public interface DefaultMethodInterface2 { default public void defaultMethod(){ System.out.println("DefaultMethodInterface2"); } }
public class HelloJava8 implements DefaultMethodInterface,DefaultMethodInterface2 { public static void main(String[] args){ DefaultMethodInterface defMethIn = new HelloJava8(); defMethIn.defaultMethod(); } }
Ans. No. Compiler gives error saying "Duplicate Default Methods"
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Q757. What If we make the method as abstract in another Interface ?
public interface DefaultMethodInterface { default public void defaultMethod(){ System.out.println("DefaultMethodInterface"); } }
public interface DefaultMethodInterface2 { public void defaultMethod(){ System.out.println("DefaultMethodInterface2"); } }
public class HelloJava8 implements DefaultMethodInterface,DefaultMethodInterface2 { public static void main(String[] args){ DefaultMethodInterface defMethIn = new HelloJava8(); defMethIn.defaultMethod(); } }
Ans. Even then the Compiler will give error saying that there is a conflict.
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Q758. What if we override the conflicting method in the Class ?
public interface DefaultMethodInterface { default public void defaultMethod(){ System.out.println("DefaultMethodInterface"); } }
public interface DefaultMethodInterface2 { default public void defaultMethod(){ System.out.println("DefaultMethodInterface2"); } }
public class HelloJava8 implements DefaultMethodInterface,DefaultMethodInterface2 { public static void main(String[] args){ DefaultMethodInterface defMethIn = new HelloJava8(); defMethIn.defaultMethod(); }
public void defaultMethod(){ System.out.println("HelloJava8"); } }
Ans. There won't be any error and upon execution the overriding class method will be executed.
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Q759. What will happen if there is a default method conflict as mentioned above and we have specified the same signature method in the base class instead of overriding in the existing class ?
Ans. There won't be any problem as the Base class method will have precedence over the Interface Default methods.
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Q760. If a method definition has been specified in Class , its Base Class , and the interface which the class is implementing, Which definition will be picked if we try to access it using Interface Reference and Class object ?
Ans. Class method definition is overriding both the definitions and hence will be picked.
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