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Q1201. What are the restrictions on querying Cassandra Tables ?

Ans. Cassandra Tables can only be queried using the partition key and then cluster keys, so all queries should have partition key for sure.

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Q1202. Can we query Cassandra Tables without specifying the partition id in the where clause ?

Ans. No.

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Q1203. How different is the Search algorithm when we query Cassandra Tables and When we query Oracle Tables ?

Ans. Relational Database uses linear search if we don't query using indices. Performance for linear search is O(n). If indices have been used , relational database uses binary search. Performance for binary search is O(Log n).

Casandra uses hash search. Performance for Hash Search is O(1).

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Q1204. How Cassandra provides better Read performance than Oracle Indices ?

Ans. Cassandra uses Hash Search which provides a look time of O(1) whereas Oracle Indices uses Binary Search that provide a lookup time of O(Log n).

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Q1205. Is Cassandra read optimized or Write optimized ?

Ans. Read optimized

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Q1206. Kafka has a deliver atleast once default Policy, What are the other policies that can be configured with Kafka ?

Ans. Exactly once and At Max Once

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Q1207. Can we mock static methods ?

Ans. Yes we can use PowerMock. With Mockito , we cannot mock static methods.

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Q1208. What are the advantage of Abstract classes over interfaces with respect to Java 7 ? and What changed in Java 8 to help facilitate that in Java 8 ?

Ans. Abstract Classes provide default implementations of methods that are inherited by the classes that extend them, which was not the case for Interfaces. This changed in Java 8, where default implementations are provided for methods.

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Q1209. How can we makes sure that message has been consumed properly from Kafka ?

Ans. We can have a mechanism to send the conformation back to Kafka so that Kafka can do offset only after receiving the confirmation.

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Q1210. Difference between stateless and stateful rest services ?

^{This question was recently asked at 'Sofi'.This question is still unanswered. Can you please provide an answer.}

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Q1211. What is the difference between stream and parallel stream ?

Ans. streams are used for sequential processing of data and parallel streams are used for parallel processing of data (only if the underlying processor is multicore).

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Q1212. Given a collection of Employee objects, how can we get the customers with name starting with 'A' using lambda expression.

Ans. List emp = Arrays.asList("American", "Indian", "Finn");
emp.stream().filter(em -> em.startsWith("A")).forEach(System.out.println);

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Q1213. If a Map needs to be accessed simultaneously by multiple threads, which collection class should be used ?

Ans. ConcurrentHashMap

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Q1214. How can we make sure that we don't receive duplicate messages from the Kafka Topic ?

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Q1215. Can we have a sub enum within an enum ?

Ans. Yes

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Q1216. Can an enum extend another enum ?

Ans. No

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Q1217. How do you design microservices?

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Q1218. Can we instantiate the object of derived class if parent constructor is private ?

Ans. No

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Q1219. What features would you like to see in Java 10 ?

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Q1220. In case of generic class declared like following , What can T hold

class MyClass<T>{
T element;
}

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Q1221. Which of the two - iteration or recursion - is slower ?

Ans. Any function call is slower than the code in the same method as Java has to maintain stack of meta and function call information. So recursion is slower.

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Q1222. In the following code, which text will get printed immediately after Hello

for(int countx=0;countx<10;count++){
System.out.println("World");
for(int countx=0;countx<10;count++){
System.out.println("Friend");
for(int countx=0;countx<10;count++){
System.out.println("Hello");
break;
}
System.out.println("Buddy");
}
}

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Q1223. As root, if you have to assign the owner for the file and set only read permission for the owner, Write a unix command to do it.

Ans. chmod 477

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Q1224. What do we mean by a Data Type ?

Ans. if you have similar type of data or objects or entities, then we can give them a type with unique name. And this name will be our Data type.

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Q1225. Why shouldn't we use string concatenation extensively or in a loop ?

Ans. Because String being an immutable object creates a new object upon each concatenation cycle. If there is any such need , we should use String Builder whose objects are mutable.

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Q1226. How is string object immutable if we can concat a string to it ?

Ans. Because it doesn't make the change in the existing string but would create a new string by concatenating the new string to previous string. So Original string won't get changed but a new string will be created. That is why when we say

str1.concat("Hello");

It means nothing because we haven't specified the reference to the new string and we have no way to access the new concatenated string. Accessing str1 with the above code will still give the original string.

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Q1227. Does Wrapper classes produces immutable objects ?

Ans. Yes

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Q1228. Why Java is considered more purer object oriented language than C++ ?

Ans. Because of

lack of use of pointers,
Lack of structural programming and
Lack of Multiple Inheritance

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Q1229. Why is Java such an important Programming language ?

Ans. Because of following features

Object Oriented and hence helps build maintainable and easily enhanceable code.
Platform Independence and hence can be executed anywhere
Fast due to JIT compiler

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Q1230. Is dependency injection possible if we don't have inheritance / Composition ?

Ans. Without composition - No, as it's the core of dependency injection.

With Inheritance - Yes, through interface implementation.

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