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What are the common tasks of JDBC? - Create an instance of a JDBC driver ....
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Explain the concepts of Exceptions in Java - Exceptions are errors that occur at runtime and disrupt the normal flow of execution of instructions in a program...
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What is class loader? Purpose of Bootstrap class loader - Class loader finds and loads the class at runtime. Java class loader can load classes from across network...
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What is a TreeSet class? - TreeSet class is used to store large amount of data and uses tree for storage.....
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String object is immutable, Explain. - This means once you have created String object and assigned a value, you can’t change the value of the object....
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Difference between traditional java Array and Arraylist class - Traditional java array is fixed length whereas ArrayList supports dynamic arrays that can grow...
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Difference between pass by value and pass by reference - In pass by value, a copy of variable is passed to the method; the values of the variable can’t be changed in the method.....
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What are access modifiers in JAVA?
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Define Savepoints in a transaction - Using Savepoint, you can mark one or more places in a transaction and you can perform rollback to one of those...
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What are filter class in java? - The filter class in java can manipulate request before reaches to the web server. It can also manipulate response before it reaches the client browser......
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How do we consume a web service in java? - Client can consume web services in java in 3 ways...
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What is Reflection API in Java? - Reflection API allows examining, modifying the run time behaviour of java applications running in the JVM...
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Difference between static and dynamic class loading - Static class loading: The process of loading a class using new operator is called static class loading...
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What is LinkedList class? - LinkedList class implements the List interface. In addition to the List operations, the LinkedList class....
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What is LinkedHashSet class? - LinkedHashSet combines the operations of LinkedList and HashSet, with the order of prediction for...
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What is Map and SortedMap Interface? - A map is an object that maps the keys to values. Map provides the facility of storing elements without....
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What is casting? What are the different types of Casting? - Type casting: Explicit conversion between incompatible types ( or ) changing entities from one data type.....
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Advantages and disadvantages of interfaces - Interfaces are mainly used to provide polymorphic behavior, Interfaces function to break up the complex..
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What is Multithreading? - A thread is one of the processes of an application. In multithreading, an OS allows different threads of an....
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Describe the types of Beans - Stateless Session Beans, Statefull Session Beans, Entity Beans......
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Explain the Common use of EJB - The EJBs can be used to incorporate business logic in a web-centric application......
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What are transaction isolation levels in EJB? - Transaction_read_uncommitted, Transaction_read_committed, Transaction_repeatable_read......
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What is Entity Bean? - The entity bean is used to represent data in the database. Entity beans provide a component model that allows.....
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What is preinitialization of a servlet? - The process of loading a servlet before any request comes in is called preloading or preinitializing a servlet.....
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What is the difference between JSP and Servlets? - JSP supports only HTTP protocol. But a servlet can support any protocol like HTTP, FTP, SMTP etc....
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What is the difference between doGet() and doPost()? - GET Method: All data we are passing to Server will be displayed in URL. Here we have size limitation......
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What's the difference between servlets and applets? - Unlike applets, servlets have no graphical user interface........
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What is JSP? - JSP is a technology that returns dynamic content to the Web client using HTML, XML and JAVA elements....
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A covariant return type allows to override a super class method that returns a type that sub class type of super class method’s return type. It is to minimize up casting and down casting......
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A callable collection is an interface whose implementers define a single method with no arguments. The Callable interface resembles Runnable..
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Java supports threads natively without using additional libraries. Using ‘synchronized’ key word makes the methods thread safe.......
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The primary goal of a constructor is to create an object. Though the constructor resembles a method, its explicit purpose is to initialize the instance variables.....
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The following are the steps to add a button in applet: 1. Declare and create the object of Button class - Button clickMe;....
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A Jar file contains mostly .class files and optionally other files like sound files, image files for Java applications, gathered into a single file in the compressed format.....
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The statement String s = “hello” is initialized to s and creates a single interned object....
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The differences of Java and Java Script are: - Java can stand on its own where as Java Script mandatorily be placed within an HTML document.....
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Upcasting: Java permits an object of a sub class can be referred by its super class. It is done automatically.....
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Classpath is the path in which JVM searches for class libraries at the time of compiling the Java Application. By setting the CLASSPATH environment variable....
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The OutOfMemoryException can occur either the JVM may have a limit of memory to access to, or the system may have run out of physical memory....
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In a pooled database connection, it is returned to the pool and could close only after expiring its life time......
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