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Q1231. If Project A is calling web service of project B and there are some changes in project B, Will Project A needs to be rebuilt ?

Ans. That depends if the interface for the resource in Project B gets changed. If only the internal implementation is changed, No change is required in Project A. Project A is not even required to be rebuilt.

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Q1232. What is Dirty read in Database Transactions ?

Ans. A dirty read occurs when a transaction is allowed to read data from a row that has been modified by another running transaction but not yet committed.

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_{Like Discuss Correct / Improve database transaction Asked in 8 Companies}

Q1233. Have you ever felt the need of keeping the constructor private ?

Ans. Yes, When either we don't want an object to be created ( class having all static elements and hence not required ) or object to be created using a static method or static block. One such example could be a situation when we would like app to load objects at start up and we would like to restrict new object creation by any request.

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Q1234. Is it a Good practice to have application decision making in DAOs ?

Ans. No, DAO's should only have methods to perform CRUD operations. Application logic should reside in service methods.

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Usually asked with Questions related to Generics.

Q1235. What are Type Erasures in Java ?

Ans. Type erasure applies to the use of generics. When generics are used, they're pre compiled into compile time checks and execution-time casts.

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_{Like Discuss Correct / Improve type erasures generics Asked in 2 Companies intermediate rare}

Q1236. Have you ever tried compressing data using Java ?

Ans. Yes, we can use ZipInputStream class for compressing the FileInputstream object.

Sample Code for ZipInputStream

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Q1237. Watching a directory for changes. Monitoring a directory.

Ans. http://www.logicbig.com/tutorials/core-java-tutorial/java-nio/java-watch-service/

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Q1238. How can one determine if JVM is 32-bit or 64-bit from Java Program ?

Ans. There is a Java system property "sun.arch.data.model" that can tell if JVM is 32 bit of 64 bit

System.getProperty("sun.arch.data.model") can be used to get that property.

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Q1239. Is ++ or -- operation thread safe in Java ?

Ans. No

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Q1240. How can we find the memory usage of JVM from Java code?

Ans. Using Runtime object.

Runtime runtime = Runtime.getRuntime();

runtime.totalMemory();
runtime.freeMemory();

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Q1241. How can we catch an exception thrown by another thread ?

Ans. http://stackoverflow.com/a/6548203/2789764

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Q1242. How can you check if a String is a 10 digit number by using regular expression ?

Ans. We can use \d{10} as the expression to check that

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Q1243. How to check the version of Java through Java program itself ?

Ans. We can use System.getProperty("java.version");

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Q1244. how can we get the System Environment variables from within Java program ?

Ans. We can use System.getenv for getting the environment variables. For ex - System.getenv("JAVA_HOME")

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Q1245. Why calculations in float or Double sometimes gives unpredictable results ?

Ans. Because the way float values are stored its not precise.

For example - 0.1 is actually stored as
0.1000000000000000055511151231257827021181583404541015625

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Q1246. If we parse any string to get another data type and the String doesn't abide by the type of data it should have hold, what would happen ?

Ans. It will throw Parse Exception.

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Q1247. Can we modify the variables defined in an interface ?

Ans. No, member variables of a interface are final by default. The final ensures the value assigned to the interface variable is a true constant that cannot be re assigned by program code.

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Q1248. Can we declare a member element as abstract ?

Ans. No, only methods can be declared abstract.

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Q1249. What is a responsive web design ?

Ans. Responsive web design is a approach to web design that allow desktop webpages to be viewed perfectly in different devices and sizes.

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_{Like Discuss Correct / Improve Asked in 1 Companies}

Q1250. Explain Travelling SalesMan Problem ?

Ans. https://en.wikipedia.org/wiki/Travelling_salesman_problem

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Q1251. What are the primitive data types in Java ?

Ans. boolean byte char double float int long short void

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Q1252. Have you ever heard of InstanceAlreadyExistsException ?

Ans. This exception usually occur if we try to register the bean with name already present in the registry or repository. Usually this happens when multiple tests are executed at once in single container.

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Q1253. What is Java NumberFormatException ?

Ans. NumberFormatException is the exception that Java throws when we try to convert one data type to the Number data type but the value is not parsable to be a Number.

For example , the following code will result in the NumberFormatException

String string = "Buggy";
int strtoInt = Integer.parseInt(string);

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Q1254. Write a Java Program to check Armstrong Number ?

Ans. http://www.programmingsimplified.com/java/source-code/java-program-armstrong-number

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Q1255. How Spliterator in Java 8 different than iterator ?

Ans. Though there are many differences the way internally they both iterates the collections and streams respectively, but the main difference in performance that is achieved by spliterator as it can iterate Streams in Parallel whereas iterator only iterates collections sequentially.

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Q1256. Which is better in terms of performance - Iterator or Spliterator ?

Ans. Spliterator has better performance potential than iterators but only if the potential is used. Spliterator can iterate streams in parallel as well as in sequence whereas iterator can only iterate in sequence.

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_{Like Discuss Correct / Improve iterator collections streams parallel streams Spliterator}

Q1257. Difference between System.out.printf and System.out.println ?

Ans. println prints an additional end of line whereas printf doesnt.

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_{Like Discuss Correct / Improve System class Streams Input Output println printf}

Q1258. What is the use of return statement without any argument ?

Ans. Such return is only expected in methods that returns void. the purpose of having return in such a method is to return the flow out of method and return to the place where it was called. Its actually used to prematurely return the control from the method.

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Q1259. Does it make sense to have return statement at the end of method ?

Ans. It make sense if its returning something. It doesnt make sense for void methods where return statement is not preceded by anything. In case of void methods , return as last statement has no impact and is actually a overhead.

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Q1260. How to specify the or/and combination restrictions within Criteria in Hibernate ?

Ans. session.createCriteria(Employee.class).add( Restrictions.or(Restrictions.like("name", "A%"),Restrictions.like("name", "B%"))).list();

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