Advanced Java Interview Questions
Advanced Java Interview Questions covers Thread Concepts, Serialization, Polymorphism, Collections of objects & classes and a lot more.Java Advanced is a Java platform extension API which offers a set of object-oriented interfaces that support a simple, high-level programming model.
Applicants, who’re looking to pursue a career in Java and are going to appear in Java Interview, need to analyze Java Advanced Interview Questions. The Following are the Top 50 Advanced Java Interview Questions and Answers for Freshers asked in MNC’s. So, job seekers go through the Advanced Java Interview Questions PDF and start their preparation according to it.
“Advanced Java” is nothing, however specialization in domains such as web, networking, data base handling etc. And, most of the packages “Advanced Java” is always start with ‘javax.servlet.
Advanced Java Interview Questions
Advanced Java Interview Questions And Answers
Advance Java also allows developers to make their own image manipulation routines without the additional cost or licensing restrictions etc. Those, who want to crack Advanced Java Interview, need to download Advanced Java Interview Questions and Answers Pdf which are very important, particularly, for freshers developers.
In addition to reading the Interview Questions On Advanced Java, we recommend to go through this page which is covering important, Multithreading Interview Questions Java Advanced and Advanced Java Interview Questions Javatpoint etc.
Question 1: Why do threads block on I/O?
Answer: The Threads block on I/O, so that another threads may run while the I/O Operation is executed.
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Question 2: Which containers use a border Layout as their default layout?
Answer: The Window, Frame and Dialog classes use a border layout as their default layout.
Question 3: What is a transient variable?
Answer: A transient variable is a variable that may not be serialized.
Question 4: What is synchronization and why is it important?
Answer: The term synchronization is the ability to control the access of multiple threads to shared resources.And it is important because, without it, it is not possible for one thread to modify a shared object while another thread is in the process of using or updating that object’s value. This often leads to major errors.
Question 5: Can a lock be acquired on a class?
Answer: Yes, a lock can be acquired on a class and this lock is acquired on the class’s Class object.
Question 6: Is null a keyword?
Answer: No, the null is not a keyword.
Question 7: What’s new with the stop(), suspend() and resume() methods in JDK 1.2?
Answer: These methods have been deprecated in JDK 1.2.
Question 8: What method is used to specify a container’s layout?
Answer: The setLayout() method is used to specify a container’s layout.
Question 9: What is the preferred size of a component?
Answer: The preferred size of a component is the minimum component size that will permit the component to show normally.
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Question 10: Which containers use a Flow Layout as their default layout?
Answer: The Panel and Applet classes use the Flow Layout as their default layout.
Question 11: What state does a thread enter when it terminates its processing?
Answer: When a thread terminates its processing, it enters the dead state.
Question 12: What is the List interface?
Answer: The List interface provides support for ordered collections of objects.
Question 13: Which characters may be used as the second character of an identifier, but not as the first character of an identifier?
Answer: The digits 0 through 9 may not be used as the first character of an identifier. But, they may be used after the first character of an identifier.
Question 14: What is the Collections API?
Answer: The Collections API is a set of classes and interfaces that support operations on collections of objects.
Question 15: How does Java handle integer overflows and underflows?
Answer: It uses those low order bytes of the consequence that can fit into the size of the type allowed by the operation.
Question 16: What is the Vector class?
Answer: The term Vector class provides the ability to implement a growable array of objects
Question 17: What modifiers may be used with an inner class that is a member of an outer class?
Answer: A (non-local) inner class may be declared as public, protected, private, static, final, or abstract.
Question 18: Is size of a keyword?
Answer: No, The size of operator is not a keyword.
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Question 19: Which java.util classes and interfaces support event handling?
Answer: The Event Object class and the Event Listener interface support event processing.
Question 20: What is the difference between yielding and sleeping?
Answer: When a task invokes its yield() method, it returns to the ready state and when a task invokes its sleep() method, it returns to the waiting state.
Question 21: Which method of the Component class is used to set the position and size of a component?
Answer: setBounds () method is used to set the position and size of a component.
Question 22: What is the difference between the >> and >>> operators?
Answer: The >> operator carries the sign bit when shifting right while the >>> zero-fills bits that have been shifted out.
Question 23: What is an Iterator interface?
Answer: The Iterator interface is used to step through the elements of a Collection.
Question 24: What are wrapped classes?
Answer: The Wrapped classes are those classes that allow primitive types to be accessed as objects.
Question 25: Does garbage collection guarantee that a program will not run out of memory?
Answer: No, Garbage collection does not guarantee that a program will not run out of memory. It is possible for programs to use up memory resources faster than they are garbage collected.
Question 26: What restrictions are placed on the location of a package statement within a source code file?
Answer: A package statement must appear as the first line in a source code file (eliminating blank lines and comments).
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Question 27: What is the immediate superclass of the Applet class?
Answer: The Panel class is the immediate superclass of the Applet class
Question 28: Can an object’s finalize() method be invoked while it is reachable?
Answer: An object’s finalize() method cannot be invoked by the garbage collector while the object is still accessible. Though, an object’s finalize() method may be invoked by other objects.
Question 29: What is the difference between preemptive scheduling and time slicing?
Answer: Under preemptive scheduling, the highest priority task performs until it enters the waiting or dead states or a higher priority task comes into existence. Under time slicing, a task performs for a predefined slice of time and then re-enters the pool of ready tasks.
Question 30: Name three Component subclasses that support painting.
Answer: The Canvas, Frame, Panel, and Applet classes support painting.
Question 31: What is the immediate superclass of the Dialog class?
Question 32: What value does readLine() return when it has reached the end of a file?
Answer: The readLine() method returns null, when it has reached the end of a file.
Question 33: What is clipping?
Answer: Clipping is the process of confining paint operations to a limited area or shape.
Question 34: What is a native method?
Answer: A native method is a method that is applied in a language other than Java.
Question 35: Can a for statement loop indefinitely?
Answer:Yes, a for statement can loop indefinitely. For example, consider the following:for(;;) ;
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Question 36: When a thread blocks on I/O, what state does it enter?
Answer: When it blocks on I/O, A thread enters the waiting state.
Question 37: To what value is a variable of the String type automatically initialized?
Answer: The default value of an String type is null.
Question 38: What is the catch or declare rule for method declarations?
Answer: If a checked exception may be thrown within the body of a method, the method must either catch the exception or declare it in its throws clause.
Question 39: What class is the top of the AWT event hierarchy?
Answer: The java.awt.AWTEvent class is the highest-level class in the AWT event-class hierarchy.
Question 40: What is the purpose of finalization?
Answer: The purpose of finalization is to give an unreachable object the opportunity to perform any cleanup processing before the object is garbage collected.
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Core Java Advanced Interview Questions
“Core Java” is Sun’s term, used to refer to Java SE, the standard edition and a set of connected technologies, like the Java VM, CORBA, et cetera. This is typically to distinguish from Java ME or Java EE, also note that it is also a set of libraries rather than the programming language. Check below listed Advanced Core Java Interview Questions and prepare well for interview session.
Question 41: What are the important features of Java 8 release?
Answer: it is one of the frequently asked questions in java interview. And, Some of the important features of Java 8 are as provided below:
- Interface changes with default and static methods
- Functional interfaces and Lambda Expressions
- Java Stream API for collection classes
- Java Date Time API
Question 42: What do you mean by platform independence of Java?
Answer: In terms of Core Java, the platform independence means that, you can run the same Java Program in any Operating System. For instance, you can inscribe java program in Windows and run it in Mac OS.
Question 43: What is JVM and is it platform independent?
Answer: Java Virtual Machine is the heart of java programming language and it is responsible for converting byte code into machine readable code. It is not platform independent that is only the reason; you have different Java Virtual Machine for different operating systems.
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Question 44: What is the difference between JDK and JVM?
Answer: we’re presenting the difference between JDK and JVM in tabular format, take a look…
|Full Form: Java Development Kit||Full Form: Java Virtual Machine|
For Development Purpose
|To execute the java programs|
|It provides all the tools, executables and binaries required to compile, debug and execute a Java Program||The execution part is handled by JVM to provide machine independence|
Question 45: Which class is the superclass of all classes?
Answer: java.lang.Object is the superclass class for all the java classes and we don’t need to extend it.
Question 46: Why Java doesn’t support multiple inheritance?
Answer: Because of “Diamond Problem”, the Java doesn’t support multiple inheritance in classes.
Question 47: Why Java is not pure Object Oriented language?
Answer: Java support primitive types such as int, byte, short, long etc that why it is not said to be pure object oriented language.
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Question 48: Can we overload main method?
Answer: Yes, we can overload the main methodwith syntax as public static void main(String args).
Question 49: What are access modifiers?
Answer: Java provides three access controlssuch as public, private and protected access modifier. When none of these are used, it’s called default access modifier.
Question 50: What is final keyword?
Answer: The final keyword is used with Class to make sure no other class can extend it, for instance String class is final and we can’t extend it.
Make your Advanced Java data strong through above listed Advanced Java Interview Questions and easily crack the interview session of TCS, Accenture, IBM, CTS, Infosys, Wipro, Tech Mahindra and Morgan Stanley etc. If you have any doubt and query regarding Advanced Java Interview Questions and Answers for Freshers / Experienced, then you can ask by leave your comment here.
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