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Interview Questions and Answers for 'Adella' - 2 question(s) found
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Q1.
What is an Interface ?
Core Java
Ans. The interface is a mechanism to achieve abstraction. Interfaces can have abstract methods and variables. It cannot have a method body.
Sample Code for interface
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 interface
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basic
 
frequent
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Differences between abstract class and interface ?
What are the different uses of Interfaces in Java ?
Why can't we have diamond problem with interfaces ?
Why do we need Thread class even in case we execute thread using runnable interface ?
What is the difference between List, Set and Map ?
or
What are the different Java Collections Interfaces ?
What are Marker Interfaces ? Name few Java marker interfaces ?
Can we declare interface methods as private ?
What is comparator interface used for ?
What is the use of runnable interface if we can always create a new thread using Thread class ?
Which of the following doesn't extend Collection interface ?
Q2.
Explain debugging
Process
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 debug
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basic
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How would you go about debugging a NullPointerException?
How to perform Maven Build and show Debug Information ?
In following log4j configuration file, How should we change the logging level to WARN
<Configuration status="DEBUG">
<Appenders>
<RollingFile name="File" fileName="logs/xyz.log" filePattern="logs/xyz-%d{MM-dd-yyyy}.log.gz">
<TimeBasedTriggeringPolicy />
</RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG">
<AppenderRef ref="File" />
</Root>
</Loggers>
</Configuration>
in the following log4j config file, How should we change the file name and format
<Configuration status="DEBUG">
<Appenders>
<RollingFile name="File" fileName="logs/xyz.log" filePattern="logs/xyz-%d{MM-dd-yyyy}.log.gz">
<TimeBasedTriggeringPolicy />
</RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG">
<AppenderRef ref="File" />
</Root>
</Loggers>
</Configuration>
In the following log4j config, What if we don't need rolling logs
<Configuration status="DEBUG">
<Appenders>
<RollingFile name="File" fileName="logs/xyz.log" filePattern="logs/xyz-%d{MM-dd-yyyy}.log.gz">
<TimeBasedTriggeringPolicy />
</RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG">
<AppenderRef ref="File" />
</Root>
</Loggers>
</Configuration>
Can you organize following Log4j levels in hierarchy ?
WARN, DEBUG,INFO, ERROR
What is the difference between INFO and DEBUG logging levels ?
What is the difference between DEBUG and TRACE logging levels ?
What do you make out of this error
org.hibernate.exception.ConstraintViolationException: could not insert: [<Entity>]
Caused by: java.sql.SQLIntegrityConstraintViolationException: ORA-00001: unique constraint (<Constraint Name>) violated
and how would you go about debugging it ?
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