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Synchronized methods are utilized to control the access to an object especially in multi threaded programming....
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The classes are available to the JVM and are referenced by the name. After JVM starts, it introduces the classes into it.....
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An abstract has one or more abstract methods apart from concrete methods. All the abstract methods must be overridden by its subclasses....
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Vector is synchronized where as ArrayList is not,Vector has a default size of size 10, where as ArrayList has no default size......
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A collection is a set of heterogeneous objects. A framework makes the applications efficient, less hard coded.....
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Shallow cloning just allows cloning the object but not their internal parts.....
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Final, finally and finalize() in Java - final – a key word / access modifier to define constants......
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The conversion of a given expression from one type to another type is referred as 'type casting'...
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There are 4 types of inner classes - Member inner class, Local inner class, Static inner class and Anonymous inner class...
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What are packages in Java? - Package is a collection of classes that avoids name space collision...
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Java Native methods - Java applications can call code written in C, C++, or assembler. This is sometimes done for performance.....
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Java Reflection API - The Reflection API allows Java code to examine classes and objects at run time. The new reflection classes....
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Java Shallow & Deep cloning - Cloning of objects can be very useful if you use the prototype pattern or if you want to store an internal copy of an object....
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Java private constructor - Private Constructors can't be access from any derived classes neither from another class. .....
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Java Static Initializers - A static initializer block resembles a method with no name, no arguments, and no return type...
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notify() Wakes up a single thread that is waiting on this object's monitor...
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Event-delegation model allows a separation between a component's design.....
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A & B In this, both the operands A as well as B are evaluated and then ‘&’ is applied to them...
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A priority is an integer value. Based on this priority the scheduler determines when to execute a task.....
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In time slicing methods, a task executes for a predefined slice of time......
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Threads communicate by sharing access to fields and the objects......
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The observable class represents an observable object.....
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ResultSetMetaData is an object that gets information about the types and properties of the columns in a ResultSet object.....
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JdbcRowSet is a connected type of rowset as it maintains a connection to the data source using a JDBC driver.....
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Difference between static and non-static member of a class - Yes, we can have.
This is also called as constructor overloading....
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Describe the use of “instanceof” keyword - “instanceof” keyword is used to check what is the type of object......
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What is the disadvantage of garbage collector? - Although garbage collector runs in its own thread, still it has impact on performance. It adds overheads....
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What is an Applet? - An applet is a small server side application that can be loaded and controlled on the browser by the client..
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Explain the life cycle of an applet. - Below are sequences of methods that describes the life cycle of an applet.....
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What is the purpose of finalization? - Finalization is the facility to invoke finalized() method. The purpose of finalization is to perform some action....
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Difference between the File and RandomAccessFile classes - The File class is used to perform the operations on files and directories of the file system of an operating......
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Define class and object - Class: A class is a program construct which encapsulates data and operations on data. In object oriented.....
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Explain class vs. instance with example using java - A class is a program construct which encapsulates data and operations on data......
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What is a method? - A java method is a set of statements to perform a task. A method is placed in a class.Signatures of methods...
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Difference between instance variable and a class variable - An instance variable is a variable which has one copy per object / instance. That means every object....
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Explain how to create instance of a class - Java supports 3 ways of creating instances - By using new operator – Ex : Product prodMouse = new Product();....
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What is an abstract class? - A class with one of more abstract methods is called an Abstract class....
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Difference between an Abstract class and Interface - An abstract class can have both abstract and concrete methods whereas an interface can have....
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What is singleton class? Where is it used? - A class is defined as singleton class, if and only if it can create only one object. This class is useful when.....
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Difference between a public and a non-public class - A class with access specifier ‘public’ can be accessed across the packages. A package is like a folder in GUI....
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What is Bootstrap, Extension and System Class loader? - The Bootstrap class loader loads key Java classes. Bootstrap class loader loads the basic classes from......
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Define JDBC - The JDBC API defines interfaces and classes for making database connections. Using JDBC, you can send SQL....
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Describe JDBC Architecture in brief. - Java application calls the JDBC library that loads a driver which talks to the database....
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Define ResultSet - ResultSet provides access to the rows of table. A ResultSet maintains a cursor pointing to its current row of data.......
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What are the types of JDBC drivers? - Native-API, partly Java driver, also called Type 2..
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Define Isolation - Isolation ensures one transaction does not interfere with another. The isolation helps when there are concurrent transactions.....
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What are the Transaction levels available? - TRANSACTION_NONE, TRANSACTION_READ_UNCOMMITED, TRANSACTION_READ_COMMITTED....
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What is the purpose of setAutoCommit do? - A connection is in auto-commit mode by default which means every SQL statement is treated as a transaction....
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What is JDBC driver? - The JDBC Driver provided by the JDBC API, is a vendor-specific implementations of the abstract classes....
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What are the steps required to execute a query in JDBC? - Register the driver with DriverManager class.....
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What is Connection pooling? - A Connection pooling is a technique of reusing active database connections instead of creating a new connection.....
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