There is a difference when looking at exception handling. Therefore, it is preferred to store the password using the char array rather than String in Java. Which is your biggest achievement in the mentioned Java project? Best practices in Java development that you followed. State the difference between an Applet and a Servlet? Answer. All Questions are answered with detailed explanations. Q.38. Generally, the sendRedirect method is considered to be slower as compared to the forward method. Answer. As a senior and matured Java Programmer you must know the answers to these questions to demonstrate basic understanding of Java language and depth of knowledge. Java automatically puts the String object into the String pool. This is list of some Java fundamental questions and answers, which are commonly asked in a Core Java interview for Experienced Developers. But, this would not be as easy using Hashtable. Differentiate between doGet() and doPost()? If you want to learn more about Future, Callable, and Asynchronous computing and take your Java Concurrency skills to next level, I suggest you check out Java Concurrency Practice in Bundle course by Java Champion Heinz Kabutz. The generated servlet class is invoked to handle the browser’s request. However, the sessions still work because the client has no ability to disable them on the server-side. doGet(): The doGet() method appends the name-value pairs on the URL of the request. Question 3: Does all property of Immutable Object needs to be final in Java? Double brace initialization in Java is a combination of two separate Java processes. Here is the Object lifecycle for reference: Created start(): The start() method contains the actual code to run the applet. In this tutorial of Java interview questions for experienced, we covered the advanced interview questions and answers which are frequently asked by the interviewers. 54 Accenture Java Developer interview questions and 49 interview reviews. This will not work if we do not override the hashcode()method. In short, CountDownLatch maintains a count of tasks whereas CyclicBarrier maintains a count of threads. Dear Readers, Welcome to Core Java Interview questions with answers and explanation. All the collection classes in the java. Question 9: What is Singleton? This question was mainly asked to see if the developer is familiar with the risk of memory leak, which sub-string can create. They are used to declare variables for subsequent use in expressions or scriptlets. In this case, another object may return different hashCode and will be stored on that location, which breaks invariant of HashMap class because they are not supposed to allow duplicate keys. codebase: It indicates the base URL of the applet if the code attribute is relative. ActiveX is a framework for building component documents with ActiveX controls. rebind() method binds the remote object to the new name. (answer)\ Indexed property: An indexed property is used when a single property can hold an array of values using the pset propertyName (propertyType[] list) method. The forName() method belongs to java.lang.Class class. This will save a lot of time spent on resizing the size of the Collection. A Java programmer uses JCA to fulfill security measures. Good article, but I’ve would say that double checked locking is considered bad practice and still doesn’t guarantee you thread safety. Q.56. Applets make the website more dynamic and entertaining. two employee object are equal if they have the same emp_id, despite the fact that they are two different objects, created by different part of the code. Answer. JSP actions use constructs in XML syntax that are used to control the behavior of the servlet engine. When the applet is loaded, first of all, an object of the applet’s controlling class is created. Remote method Invocation allows the code that defines the behavior and the code that implements the behavior to remain separate and to run on separate JVMs”. What is the difference between a ClassNotFoundException and NoClassDefFoundError? (answer)\ Other methods of life cycle are start(), stop() and paint(). Singleton in Java is a class with just one instance in whole Java application, for example, java.lang.Runtime is a Singleton class. The applet security manager class is a mechanism to impose restrictions on Java applets. 4. Q.5. Btw, if you want to learn more about memory management in Java, I recommend to check out Understanding the Java Virtual Machine: Memory Management course By Kevin Jones on Pluralsight. Actually, there are four ways to iterate over any Map in Java, one involves using keySet() and iterating over a key and then using get() method to retrieve values, which is bit expensive. It is a synchronization mechanism that synchronizes threads progressing through some algorithm. Answer. Q.94. Both the methods System.gc() and Runtime.gc() help to give a hint to the JVM, so that JVM can start a garbage collection. The above statement does not put the String object str in the String pool. Answer. Answer. Java Reflection is powerful, and it can be advantageous. Question 16: What is the difference between creating String as new() and literal? In this case, another object may return a different hash code and will be stored in that location. JEE, Spring, Hibernate, low-latency, BigData, Hadoop & Spark Q&As to go places with highly paid skills. You can achieve the same functionality by making member as non-final but private and not modifying them except in constructor. It waits till it gets the result of the method invocation and execution. Q.68. Q.23. Answer. It is an object that creates new threads on demand. On the other hand, the time complexity of an insertion operation for an unordered array is constant: O(1). If there is any core Java interview question that has been asked to you, kindly post it in the ask question section. Also, they are allowed to execute processes and are not passed through the byte code verifier. 1. Some best practices related to Java collection framework are: Answer. resources cannot be preempted. (answer). An applet cannot make network connections except the host from which it came. Marshalling: When a client invokes a method that accepts parameters on a remote object, it bundles the parameters into a message before sending it over the network. So let’s begin with Java interview questions for experienced professionals. JSP elements construct dynamic content. Directives are instructions that JSP engine processes to convert a page into a servlet. For a task that was submitted with submitting and that terminates with an exception, the Future.get() will re-throw this exception, wrapped in an ExecutionException. Answer: Well, nothing is wrong, it depends upon how you use. Answer. Q.72. We can do it without knowing the names of the classes, methods, at compile time. This article provides interview questions for experienced Java professionals. Answer. Some of the best coding practices in Java can be: Answer. The verifier also ensures that there are no stack overflows or underflows and that the parameters to all bytecode instructions are correct. Top 70+ Java interview questions and answers for experienced 2021. This method returns the reference of the remote object. Answer. Yes, these questions are not for beginners or 1 to 2 years of Java experienced professional as often banks don't hire them via open interviews, they mostly join as graduate trainees, but they can also learn a lot by just going through questions and understanding answers and concepts behind them. Q5 Name the core Collection interfaces? Also, it makes the values of the request visible, and thus, sensitive information must not be passed in that way. does not put the object str in String pool, we need to call String.intern() method which is used to put them into String pool explicitly. Does the garbage collector of Java guarantee that a program will not run out of memory? If you want to know more about final variables in Java, I recommend joining The Complete Java MasterClass on Udemy, one of the best, hands-on course. This post comes directly from my 14+ years of Java programming and lots of interviewing experience. It’s good for beginners as well as experienced Java developers. When the first exception causes another exception to execute in a program, such a condition is termed as Chained Exception. Answer. Permanent Generation is populated by the JVM during the runtime on the basis of classes used by the application. Made with love and Ruby on Rails. Q.13. Learn Now. What are the advantages of Java Beans? The client can choose to disable cookies. Q.59. Java interview questions. Answer. stop(): The stop() method is used to stop the execution of the applet. The termination of thread takes less time. It is only possible when we create a String object as String literal. An applet program performs small tasks or parts of it. (answer)\ Connection pooling is a mechanism where we create and maintain a cache of database connections. Furthermore, there are no limitations on the number of values to be sent across. Question 5: Can you write a critical section code for the singleton? A JSP(Java Server Page) page is a text document that has two types of text: static data and JSP elements. An Applet does not require the main method() for its execution. Why does the Collection interface not extend the Cloneable or Serializable interfaces? This method returns an array of the names of the remote objects in the registry. Here you can check Java training details and JAVA Training Videos for self learning. Some important characteristics of a HashMap are its capacity, its load factor, and the threshold resizing. The Naming class also provides methods to get and store the remote object. to implement the security functions. Java uses some data types (char, byte, float) which are not objects. Java Beans can perform simple functions, such as checking the spelling of a document or complex functions such as forecasting the performance of a stock portfolio. This forName() method loads the driver that establishes a connection to the database. Answer. The objects are considered as implicit in a JSP page are: Q.69. If you are interested in this then this Design Pattern library is a good collection of that. The final keyword applies restrictions on class, method, and variable. The Servlet Engine loads the servlets on every client’s request, and invokes its init methods, for the servlet to be initialized. We can use reflection to get information about Class, Constructors, and Methods, etc. This list of 43 JSON questions will help you to crack your next JSON job interview.

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