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| Ans. High bandwidth and availability in NAT Gateway NAT Gateway is completely managed by AWS NAT Gateway is auto scalable NAT Instance is just like EC2 instance and hence backed by security group NAT Instance can be used as bastion host whereas NAT Gateway cannot be. | ||||
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 Discuss Correct / Improve  aws nat instance aws nat gateway | ||||
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| Ans. Deserialization. In serialization, we can save the object of a byte stream into a file or send over a network. Suppose if you serialize the Singleton class, and then again de-serialize that object, it will create a new instance, hence deserialization will break the Singleton pattern. To overcome this issue, we need to override readResolve() method in the Singleton class and return the same Singleton instance. | ||||
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Discuss Correct / Improve singleton design patterns  Asked in 1 Companies | ||||
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| Ans. As String is immutable so by maintaining pool area we can refer the object to same area if they are with same content. But when it comes to string buffer or builder then due to mutable property if we do so then all the objects referring to that area will from now has new content.. So as to avoid this pool is present only in string. | ||||
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| This question was recently asked at 'oodles technology'.This question is still unanswered. Can you please provide an answer. | ||||
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| Ans. IP Authentication IP Range Authentication Certificates Authentication Cards | ||||
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| Ans. A List is an child interface of collection interface in java where as Linked list is and implementation class of List interface which has doubly linked as a underlying data structure | ||||
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| Discuss Correct / Improve linkedlist list vs linkedlist Asked in 1 Companies | ||||
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| Ans. Using ./ | ||||
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| Ans. I would choose Eager as the cost for 1 additional object is too minute for any such consideration. Eager Loading results in Faster access ( Object available at load time) at the cost of additional space. Lazy loading results in space saving ( Object available at first use ) at the cost of access speed. | ||||
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| Discuss Correct / Improve design Pattern Singleton Lazy vs Eager Loading | ||||
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| Ans. It's PAAS ( Platform as a service ) | ||||
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| Discuss Correct / Improve Google App Engine | ||||
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| Ans. 1. Fault Tolerance 2. Better Access by bringing the application closer to the users. | ||||
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| Discuss Correct / Improve Google Cloud Computing (GCP) Amazon Web Services (AWS) Availability Zones Regions and Zones Infrastructure | ||||
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| Ans. Yes, Cross-Site Request Forgery (CSRF) is an attack that forces an end user to execute unwanted actions on a web application in which they're currently authenticated. | ||||
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| Discuss Correct / Improve csrf attack Cross-Site Request Forgery (CSRF) Asked in 16 Companies | ||||
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| Ans. No, they should be created before authentication too https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#login-csrf | ||||
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| Discuss Correct / Improve csrf token csrf attack | ||||
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| Ans. ConcurrentMap is an interface and it is a member of the Java Collections Framework. It represents a Map that is capable of handling concurrent access to it without affecting the consistency of entries in a map. ConcurrentMap interface present in java.util.concurrent package. HashMap operations are not synchronized, while Hashtable provides synchronization. Though Hashtable is thread-safe, it is not very efficient. To solve this issue, the Java Collections Framework introduced ConcurrentMap in Java 1.5. | ||||
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| Discuss Correct / Improve Concurrent Interface java.util.concurrent Java 8 Concurrency java concurrency java 8 Asked in 1 Companies | ||||
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| This question was recently asked at 'Ksolves'.This question is still unanswered. Can you please provide an answer. | ||||
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| Discuss Correct / Improve Amazon Web Services (AWS) Google Cloud Platform (GCP) | ||||
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| Ans. Cyclic instantiation in OOPs may happen if Class A loading results in Class B Loading , and then Class B Loading results in Class C loading and then Class C has a static reference to Class A and hence results in cyclic instantiation or loading. | ||||
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| Ans. What if the initialization throws an exception. In that case , it will let it move forward without initializing the final field. So it's a way to enforce that either the field is initialized or it fails completely. | ||||
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| Discuss Correct / Improve oops | ||||
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| Ans. No | ||||
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| Discuss Correct / Improve overriding access specifier oops java yes-no | ||||
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| Ans. Multiple servlets serving the request in chain. | ||||
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Discuss Correct / Improve java web application servlets Asked in 1 Companies  rare | ||||
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| Ans. Though Static methods cannot access the instance variables directly, They can access them using instance handler. | ||||
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Discuss Correct / Improve static static method java oop variables Asked in 1 Companies  basic frequent | ||||
 Very frequently asked. Usually asked in this format or as difference with interfaces / concrete classes. | ||||
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| Ans. Abstract class is the class that is not supposed to be instantiated. The purpose of the class to only have extension to the derived class. | ||||
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| Discuss Correct / Improve abstract class Asked in 6 Companies basic frequent | ||||
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| Ans. Java.util.Map | ||||
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| Discuss Correct / Improve java collections hashtable map basic rare | ||||
| Frequently asked. | ||||
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| Ans. Iterator is an interface that provides methods to iterate over any Collection. | ||||
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| Discuss Correct / Improve java collections iterator Asked in 11 Companies basic frequent | ||||
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| Ans. java.util.map | ||||
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| Discuss Correct / Improve java collections map basic frequent | ||||
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| Ans. No. Static methods belong to the class and not the objects. They belong to the class and hence doesn't fit properly for the polymorphic behavior. | ||||
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| Discuss Correct / Improve java oops static static method overriding intermediate | ||||
 Try 3 Question(s) Test | ||||
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| Ans. They both represent the long primitive type. They are exactly the same. | ||||
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| Discuss Correct / Improve java data types long.Class long.TYPE advanced expert rare | ||||
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| Ans. No | ||||
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| Discuss Correct / Improve java constructor copy constructor yes-no | ||||
| Frequently asked to fresh graduates. | ||||
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| Ans. 1. when an OS wants to start running program it creates new process means a process is a program that is currently executing and every process has at least one thread running within it. 2). A thread is a path of code execution in the program, which has its own local variables, program counter(pointer to current execution being executed) and lifetime. 3. When the JavaVirtual Machine (JavaVM, or just VM) is started by the operating system, a new process is created. Within that process, many threads can be created. 4. Consider an example : when you open Microsoft word in your OS and you check your task manger then you can see this running program as a process. now when you write something in opened word document, then it performs more than one work at same time like it checks for the correct spelling, it formats the word you enter , so within that process ( word) , due to different path execution(thread) all different works are done at same time. 5. Within a process , every thread has independent path of execution but there may be situation where two threads can interfere with each other then concurrency and deadlock come is picture. 6. like two process can communicate ( ex:u open an word document and file explorer and on word document you drag and drop another another file from file explorer), same way two threads can also communicate with each other and communication with two threads is relatively low. 7. Every thread in java is created and controlled by unique object of java.lang.Thread class. 8. prior to jdk 1.5, there were lack in support of asynchronous programming in java, so in that case it was considered that thread makes the runtime environment asynchronous and allow different task to perform concurrently. | ||||
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| Discuss Correct / Improve java operating system threads processes Asked in 2 Companies frequent | ||||
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| Ans. class A { void test() { System.out.println("test() method"); } } class B { void test() { System.out.println("test() method"); } } Suppose if Java allows multiple inheritance like this, class C extends A, B { } A and B test() methods are inheriting to C class. So which test() method C class will take? As A & B class test() methods are different , So here we would Facing Ambiguity. | ||||
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| Discuss Correct / Improve java oops inheritence multiple inheritence Asked in 1 Companies basic frequent | ||||
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| Ans. Threads enters to waiting state or block on I/O because other threads can execute while the I/O operations are performed. | ||||
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| Discuss Correct / Improve java threads multithreading scheduling operating system | ||||
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Which of the following can be marked static ?
