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Wednesday, 29 October 2014

JAVA Interview Questions For Freshers

QUESTION - What is byte code in the context of Java?

-The type of code generated by a Java compiler
-The type of code generated by a Java Virtual Machine
-It is another name for a Java source file
-It is the code written within the instance methods of a class.

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Core Java  interview test (72 questions)
-By Pradip Patil, Lecturer IIMP MCA
Java  (20 questions)
-By Pradip Patil, Lecturer IIMP MCA

QUESTION - What is garbage collection in the context of Java?

-The operating system periodically deletes all of the java files available on the system.
-Any package imported in a program and not used is automatically deleted.
-When all references to an object are gone, the memory used by the object is automatically reclaimed.
-The JVM checks the output of any Java program and deletes anything that doesn't make sense.

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QUESTION - What is different between a Java applet and a Java application?

-An application can in general be trusted whereas an applet can't.
-An applet must be executed in a browser environment.
-An applet is not able to access the files of the computer it runs on
-All of the above

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QUESTION - You read the following statement in a Java program that compiles and executes.

submarine.dive(depth);

What can you say for sure?

-depth must be an int
-dive must be a method.
-dive must be the name of an instance field.
-submarine must be the name of a class

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QUESTION - Which is true about an anonymous inner class?

-It can extend exactly one class and implement exactly one interface.
-It can extend exactly one class and can implement multiple interfaces.
-It can implement multiple interfaces regardless of whether it also extends a class.

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QUESTION - If a thread is to be declared as a daemon thread, it must be declared before

-start method
-run method
-stop method
-none

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QUESTION - Under what circumstances might you use the yield method of the Thread class

-To call from the currently running thread to allow another thread of the same or higher priority to run
-To call on a waiting thread to allow it to run
-To allow a thread of higher priority to run
-To call from the currently running thread with a parameter designating which thread should be allowed to run

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QUESTION - Which of the following is the correct syntax for suggesting that the JVM performs garbage collection

-System.free();
-System.setGarbageCollection();
-) System.out.gc();
-System.gc();

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QUESTION - When method defined in subclass which has same signature as a method in a super class, it is known as method ________________

-Overloading
-Overriding
-Packing
-none of these

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QUESTION - In an AWT or Swing container, BoxLayout places the components in which form?
1) left to right
2) top to bottom
3)right to left
4)bottom to top

-1
-2
-1 and 2
-3 and 4

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QUESTION - A class that cannot be a subclass is called as______ class.

-abstract
-parent class
-Final
-none of these

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QUESTION - Which model used in swing component?

-Model view controller
-Event delegation model
-Document object model
-network model

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QUESTION - When several threads act on object simultaneously and the result is reliable then it is known as ____________

-Boxing
-Unsynchronized
-synchronized
-none of these

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QUESTION - All collection classes in java.util package are implementation classes of different interfaces

-True
-False

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QUESTION - DeflaterOutputStrem and InflaterInputStream classes are available in which package?

-java.io
-java.util
-java.io.zip
-java.util.zip

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QUESTION - Process of storing the object contain into the file is known as ______________

-synchronization
-serialization
-zip
-doping

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QUESTION - Static and transient variable cannot be serialized

-Yes
-No

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QUESTION - All components from javax.swing are developed in ______________

-C++
-C
-pascal
-pure java

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QUESTION - FileOutputStream class store the data in the form of _________

-character
-file
-bytes
-bit

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QUESTION - What is the default buffer size used by any buffered class?

-128 bytes
-256 bytes
-512 bytes
-1024 bytes

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Download Java interview questions and answers pdf 
Explain the difference between Java and JavaScript.
Explain how to obtain a performance profile of my Java Program.
Explain the purpose of the executable files that have an extra _g at the end of their names, e.g. java_g.
If Java is platform independent, why doesn't it run on all platforms?
Explain how to access native operating system calls from my Java program.
How do we create and use sockets in Java?
Explain how to send data from my Java program to a CGI program.
Explain the difference between a URL instance and a URLConnection instance.
How do I read a line of input at a time in Java?
Why is thread synchronization important for multithreaded programs?
Explain how to create a thread and start it running.
When should we use an event adapter class?
Explain the component and container classes.
What is the difference between a runtime exception and a plain exception?
Can you explain in brief life cycle for stateless and stateful beans?
What is Passivation and Activation in EJB?
How do we implement caching in JSP?
Explain the different Authentication options available in Servlets.
How can we use beans in JSP?
Explain the difference between JavaBeans and taglib directives.
Explain the different scopes an object can have in a JSP page.
Explain the use of Externalization interface.
Explain widening conversion and Narrowing conversion.
How do we implement deep cloning?  

Java interview questions and answers for freshers and experienced

Java features
Simple, Object-Oriented, Robust, Distributed, Portable, Interpreted, Multithreaded, Platform Independent, Secure...........
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Java program execution
What is JVM? Explain its roles and functions.
Explain why Java is called as Platform independent language. Explain how Java executable executes on any platform where JVM is available...................
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Java architecture
Java programming language, Java class file format, Java Application Programming Interface, Java virtual machine.............
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Java class
Explain the features of Java class. Explain Fields, Methods, and Access Levels.
What are accessors and mutator methods in a Java class? Explain with example for each.
Explain the importance of 'this' reference. Write a code to depicts the use of 'this' reference
Explain static variables and static methods in Java. Provide an example to explain them..................
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Java constructors
What is a constructor? Explain the differences between methods and constructor.
Differences between constructors and methods.
Write code to depict the use of constructor.....................
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Java class member
What is instance members? Explain with an example
What is instance variable? Explain with an example
What is instance method? Explain with an example
What is static member? Explain with an example
What is static variable? Explain with an example......................
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Java packages
What are Java packages? Explain the importance of Java packages.
Steps for creating a package in Java
Explain the packages access specifier, i.e. private, protected, public, default.............
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Java garbage collector
Explain Java Garbage collector. Why garbage collection? Brief explanation of Garbage collection algorithms.
Explain the importance of finalizers in Java. Write code to depict the uses of finalizers in Java...............
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Java super keyword
Explain the importance of 'super' keyword in Java. Write code to depict the uses of 'super' keyword - The keyword ‘super’ is used for referring parent class instance....................
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Java overloading & overriding
Define Method overloading. Explain its uses. Provide a code sample to explain the uses of Method overloading
Define Method overriding. Explain its uses. Provide a code sample to explain the uses of Method overloading
Difference between overloading and overriding.......................
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Java string class
Describe Java string class. Explain methods of Java string class. Explain the characteristics of StringBuffer class - String Class: The String class is immutable, The contents of the String object can not be changed, String class is final class. That implies it can not have sub classes......................
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Java inner classes
What is Java inner class? Explain the types of inner classes, i.e. Static member classes, Member classes, Local classes, Anonymous classes
Need of inner class in context with adapter classes
Explain few Wrapper Classes Methods...............
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Java reflection class
Explain about Java reflection class.
Write a code sample to depict the uses of Java reflection class.........
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Java swing
What is Swing? Explain the need of Swing.
Write some important features of Swing.
Describe Java Swing class hierarchy.
Explain the need of Layout manager...........
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Java layout manager
Explain different layout manager in Java. - A layout manager organizes the objects in a container, Different layouts are used to organize or to arrange objects.............
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Java exception handling
Explain the need of Exception handling.
Explain the Exceptions categories, i.e. checked and unchecked exceptions.
Provide the general form of Exception handling constructs with explanation
What is user defined Exception? Explain with an example............
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Java multithreading
What is Multithreading? Explain the life cycle of a thread.
Explain how to use thread class for Multithreading in Java. Explain with an example.
What is Runnable interface? Explain how to use Runnable interface for Multithreading.
What are the methods of thread class in java? Explain them
Can your explain thread priorities?..............
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Java file handling
Explain the use of Streams.
Difference between Stream classes and Reader writer classes
Explain and demonstrate the use of File, RandomAccessFile classes.
Explain the use of Reader and Writer classes..............
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Java utility classes
What is object Serialization? Explain the use of Persisting object.
Depict the step of using object Deserialization.....................
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Java socket programming
What is socket? Explain the features of socket.
Explain the characteristics of Java socket class.
Explain ServerSocket class with an example
Explain InetAddress class with an example
Explain DatagramSocket class with an example
Explain DatagramPacket class with an example.............
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JDBC
Purposes of JDBC API
Describe 4 types of JDBC drivers and their characteristics with usages.
State the functionalities of important classes in JDBC packages.
Explain how to use JDBC statement to execute SQL queries. Show in an example
Explain how to use Prepared Statement to execute parameterized queries. Show in an example
What is JDBC Callable Statement?
What is batch updates in JDBC? Explain with an example......................
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