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 Q541. Create a Table with 2 Columns and Insert a row into itDatabase
Ans. CREATE TABLE TABLE_NAME (
ID NUMBER PRIMARY KEY,
NAME VARCHAR(50) NOT NULL,
);

INSERT INTO TABLE_NAME(ID, NAME) VALUES(1, "Abc");

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   Like         Discuss         Correct / Improve     ddl  dml  create table  insert records into table     Asked in 1 Companies

 Q542. What is the difference between compilation and decompilation ?Core Java
Ans. Compilation is the process of converting Java source files to class files which can be executed by the Java runtime environment whereas Decompilation is the process of converting class files back to the Java Source code.

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   Like         Discuss         Correct / Improve     compilation vs decompilation  compiler vs decompiler

 Q543. What will be the output of following code ?

Base Interface

public interface BaseInterface {
   int i = 4;
}

Derived Interfaces

public interface DerivedInterface1 extends BaseInterface{
   int i = 5;
}

public interface DerivedInterface2 extends BaseInterface{
   int i=6;
}

Implementing Class

public class Class implements DerivedInterface1,DerivedInterface2 {
int i=10;   

public static void main(String[] args){
      System.out.println(new Class().i);
   }
}

What will be the output upon executing main and Why ?		Core Java
Ans. 10

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   Like         Discuss         Correct / Improve     interfaces  coding  code      intermediate

 Q544. What will be the output of following code ?

Base Interface

public interface BaseInterface {
   int i = 4;
}

Derived Interfaces

public interface DerivedInterface1 extends BaseInterface{
   int i = 5;
}

public interface DerivedInterface2 extends BaseInterface{
   int i=6;
}

Implementing Class

public class Class implements DerivedInterface1,DerivedInterface2 {
   public static void main(String[] args){
      System.out.println(BaseInterface.i);
   }
}

What will be the output upon executing main and Why ?		Core Java
Ans. It will print 4 because member elements of an interface are implicitly static and hence the concept of overriding doesn't work.


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   Like         Discuss         Correct / Improve     interfaces  coding  code  extending interfaces  diamond interfaces     Asked in 1 Companies      intermediate

 Q545. Write any sorting algorithm.Algorithm
Ans. https://javasearch.buggybread.com/InterviewQuestions/questionSearch.php?searchOption=label'

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   Like         Discuss         Correct / Improve     Algorithm  Sorting Algorithm     Asked in 4 Companies      basic        frequent

 Q546. What is a certificate authority ?Security
Ans. A trusted organization which issues public key certificates and provides identification to the bearer.

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   Like         Discuss         Correct / Improve     authentication  auth certificates

  Q547. What is the difference between authentication and authorization ?Authentication
Ans. Authentication is the process of verifying the identity and credentials of the user to authenticate him into the system.

whereas

Authorization is the process by which access to a segment , method or resource is determined.

Authorization is usually a step next to authentication.

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   Like         Discuss         Correct / Improve     authentication  authorization  authentication vs authorization     Asked in 9 Companies      basic        frequent

 Q548. What is the difference between

File f = new File("homexyz.txt");

and

File f = File.createTempFile("xyz",".txt","home"); ?		Core Java
Ans. First will not create physical file in storage whereas the second will.

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   Like         Discuss         Correct / Improve     file handling  File.createTempFile  file handling      intermediate        rare

 Q549. Can you name some of the Java frameworks in different domains ?Frameworks
Ans. Web Framework - Spring , Struts, Play
Dependency Injection frameworks - Google Guice , PicoContainer and Dagger
ORM Framework - Hibernate
Big Data / ETL Frameworks - Apche Hadoop , Apache Crunch, Apache Spark.
View Frameworks - JSF , Apache Wicket,jtwig.
Java Gui Frameworks - SWT , AWT, JavaFX
Testing - Junit, Mockito, PowerMock, EasyMock, JMock, JMockit
Rest Web services - Jersey , Restlet , RestX, RestEasy ,Restfulie

Here is the big list for reference - http://javasearch.buggybread.com/home2.php?keyword=

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   Like         Discuss         Correct / Improve     frameworks     Asked in 2 Companies      intermediate        frequent

 Q550. What are the benefits of creating immutable objects ?Core Java
Ans. 1. Security and Safety - They can be shared across multiple threads as they are thread safe. Moreover, it protects then from bad state due to interception by the other code segment. One such problem due to mutability and access by alternate code segment could be the change of hash code and then the impact on its search with hash collections.

2. Reuse - In some cases they can be reused as only one copy would exist and hence it can be relied upon. For example - String Pool

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 Q551. How does Lazy Initialization helps improving performance of an application ?Hibernate
Ans. Lazy Initialization means , Load Dependencies when required. Which means less load on application resources as only required data is loaded upfront. It's not only good for better performance but for better resource utilization too.

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 Q552. What are the points to be considered if we move from Eager initialization to Lazy Initialization in Hibernate ?Hibernate
Ans. Make sure that the properties of dependent Hibernate entities are not accessed and if yes, better wrap the whole code within single transaction.

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   Like         Discuss         Correct / Improve     lazy loading  lazy initialization

Usually asked to entry level software developers.
  Q553. Write a program to swap two variables without using thirdCore Java
Ans. public static void main(String[] args) {
   int num1 = 1;   
   int num2 = 2;
   num1 = num1^num2;
   num2 = num1^num2;
   num1 = num1^num2;
   System.out.print("num1 = " + num1 +", num2 = "+num2);
}

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   Like         Discuss         Correct / Improve     code  coding     Asked in 37 Companies      basic        frequent

 Q554. What is memory leak ? How Java helps countering memory leaks compared to C++ ?Core Java
Ans. Memory Leak is a situation wherein we have a reserved memory location but the program has lost its reference and hence has no way to access it.

Java doesn't have concept of Pointers, Moreover Java has concept of Garbage collection that frees up space in heap that has lost its references.

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   Like         Discuss         Correct / Improve     memory leak  garbage collection      intermediate        frequent

 Q555. How should we handle errors while writing or accessing Stored Procedures?Database
Ans. Store Procedure returns the error code. Moreover we can put the call withing try block and catch SQL Exception.

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   Like         Discuss         Correct / Improve     stored procedure  exception handling

 Q556. Explain dot(.) operator ?Core Java
Ans. Its used to access the object properties using the object reference or class properties using the Class Name. Moreover its used to access the classes and Interfaces of a package.

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   Like         Discuss         Correct / Improve     operators

 Q557. How are DB transactions handled in Hibernate ? Hibernate
Ans. // Non-managed environment idiom
Session sess = factory.openSession();
Transaction tx = null;
try {
tx = sess.beginTransaction();

// do some work
...

tx.commit();
}
catch (RuntimeException e) {
if (tx != null) tx.rollback();
throw e; // or display error message
}
finally {
sess.close();
}

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 Q558. What actions you take if there is an issue related to Database server ?Support
Ans. We involve DBA and try to solve it through them. By the time they are solving it , we keep the stake holders informed regarding the progress.

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   Like         Discuss         Correct / Improve     database  database server  production support

 Q559. How do you monitor your logs while investigating a high severity problem ?Support
Ans. We try to look for errors in the last n minutes when the issue occurred. If the issue is still occurring intermittently, We tail the logs for different application server instances to see the error snippets coming in the live logs.

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 Q560. Which Web and Application server is being used by your application ?Server
Ans. We are using Apache 2.3 and Tomcat 5.6

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   Like         Discuss         Correct / Improve     web server  application server  server      Basic        frequent

 Q561. What are the cursors available in Java ?Core Java
Ans. Enumeration
Iterator
List iterator

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   Like         Discuss         Correct / Improve     cursors  iterator

 Q562. how to access the methods of an inner class?Core Java
Ans. It depends on the type of inner class

To access non static inner class method

new OuterClass().new InnerClass().getMethod();

To access static method of static inner class

new OuterClass.InnerClass().getMethod();

  Sample Code for inner class

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   Like         Discuss         Correct / Improve     inner classes  nested aclasses     Asked in 1 Companies      Intermediate        frequent

 Q563. Which interface is responsible for transaction management in JDBC ?Database
Ans. Connection Interface

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   Like         Discuss         Correct / Improve     jdbc

 Q564. Can we convert a numeric IP address to a web host name ?Java EE
Ans. Yes, using InetAddress.getByName("<IP Address>").getHostName();

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   Like         Discuss         Correct / Improve     ip address to hostname  INETAddress      intermediate

 Q565. What is an IO Filter ?Core Java
Ans. It's an object that reads from one stream and writes to another.

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   Like         Discuss         Correct / Improve     java io  io filter      intermediate

 Q566. What is the difference between the Reader/Writer java.io hierarchy and the Stream class hierarchy?Core Java
Ans. The Reader/Writer hierarchy is character oriented, whereas the Stream class hierarchy is byte oriented.

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   Like         Discuss         Correct / Improve     java io  streams      intermediate

 Q567. What kind of thread is garbage collection thread ?Core Java
Ans. Daemon thread

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 Q568. What is nested interface?Core Java
Ans. Interface that is declared inside the interface or class, is known as nested interface. It is static by default.

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 Q569. How does Java handle integer overflows and underflows?Core Java
Ans. It uses those low order bytes of the result that can fit into the size of the type allowed by the operation.

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   Like         Discuss         Correct / Improve     integer  data types     Asked in 1 Companies        rare

 Q570. Is there a way to know size of an object in Java ?Core Java
Ans. No, Java doesn't have a sizeOf operator. In C / C++ , its required to determine how much memory allocation is required which is not the case with Java. Java handles memory allocation and deallocation intrinsically.

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