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| Ans. Translation of JSP PageCompilation of JSP PageClassloading (class file is loaded by the classloader)Instantiation (Object of the Generated Servlet is created).Initialization ( jspInit() method is invoked by the container).Reqeust processing ( _jspService() method is invoked by the container).Destroy ( jspDestroy() method is invoked by the container). | ||||
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 Discuss Correct / Improve  j2ee servlets servelets web application jsp jsp life cycle mindtree  Asked in 9 Companies | ||||
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| Ans. The jsp directives are messages that tells the web container how to translate a JSP page into the corresponding servlet. There are three types of directives - page directive include directive taglib directive | ||||
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| Discuss Correct / Improve j2ee servlets servelets web application jsp jsp ldirectives | ||||
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| Ans. In GUI programming, an object that can be registered to be notified when events of some given type occur. The object is said to listener? for the events. | ||||
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| Discuss Correct / Improve java gui ui programming swing awt swt listener architecture | ||||
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| Ans. We are initializing a static and constant string array named as COLORS using Strings "Red","Green" and "Blue". | ||||
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| Ans. A way of encoding characters as binary numbers. The Unicode character set includes characters used in many languages, not just English. Unicode is the character set that is used internally by Java. | ||||
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| Discuss Correct / Improve java character encoding unicode architecture | ||||
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| Ans. ThreadFactory is an interface that is meant for creating threads instead of explicitly creating threads by calling new Thread(). Its an object that creates new threads on demand. Using thread factories removes hardwiring of calls to new Thread, enabling applications to use special thread subclasses, priorities, etc. | ||||
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Discuss Correct / Improve java threads multi threading thread factory thread creation advanced  expert | ||||
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| Ans. You can put related classes together as a single logical group. Nested classes can access all class members of the enclosing class, which might be useful in certain cases. Nested classes are sometimes useful for specific purposes. For example, anonymous inner classes are useful for writing simpler event-handling code with AWT/Swing. | ||||
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| Discuss Correct / Improve java nested classes inner classes oops classes | ||||
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| Ans. The accessibility (public, protected, etc.) of the static nested class is defined by the outer class. A static nested class is not an inner class, it's a top-level nested class. The name of the static nested class is expressed with OuterClassName.NestedClassName syntax. When you define an inner nested class (or interface) inside an interface, the nested class is declared implicitly public and static. Static nested classes can be declared abstract or final. Static nested classes can extend another class or it can be used as a base class. Static nested classes can have static members. Static nested classes can access the members of the outer class (only static members, obviously). The outer class can also access the members (even private members) of the nested class through an object of nested class. If you don't declare an instance of the nested class, the outer class cannot access nested class elements directly. | ||||
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| Discuss Correct / Improve java oops nested classes static nested classes inner classes | ||||
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| Ans. The accessibility (public, protected, etc.) of the inner class is defined by the outer class. Just like top-level classes, an inner class can extend a class or can implement interfaces. Similarly, an inner class can be extended by other classes, and an inner interface can be implemented or extended by other classes or interfaces. An inner class can be declared final or abstract.Inner classes can have inner classes, but you will have a hard time reading or understanding such complex nesting of classes. | ||||
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Discuss Correct / Improve java oops classes inner classes Asked in 2 Companies Basic  frequent | ||||
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| Ans. You can create a non-static local class inside a body of code. Interfaces cannot have local classes, and you cannot create local interfaces. Local classes are accessible only from the body of the code in which the class is defined. The local classes are completely inaccessible outside the body of the code in which the class is defined. You can extend a class or implement interfaces while defining a local class. A local class can access all the variables available in the body of the code in which it is defined. You can pass only final variables to a local inner class. | ||||
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| Discuss Correct / Improve java oops inner classes local classes classes method local inner classes Asked in 1 Companies | ||||
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| Ans. Anonymous classes are defined in the new expression itself, so you cannot create multiple objects of an anonymous class. You cannot explicitly extend a class or explicitly implement interfaces when defining an anonymous class. An anonymous inner class is always created as part of a statement; don't forget to close the statement after the class definition with a curly brace. This is a rare case in Java, a curly brace followed by a semicolon. Anonymous inner classes have no name, and their type must be either a subclass of the named type or an implementer of the named interface | ||||
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| Discuss Correct / Improve java oops inner classes anonymous inner classes classes Asked in 1 Companies | ||||
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| Ans. That would not be a problem as both are specifying the contract that implement class has to follow. If class C implement interface A & interface B then Class C thing I need to implement print() because of interface A then again Class think I need to implement print() again because of interface B, it sees that there is already a method called test() implemented so it's satisfied. | ||||
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| Discuss Correct / Improve java oops interfaces multiple inheritance | ||||
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| Ans. Arrays provide a structure wherein multiple values can be accessed using single reference and index. This helps in iterating over the values using loops. | ||||
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| Ans. Class.getInstance doesn't call the constructor whereas if we create an object using new operator , we need to have a matching constructor or copiler should provide a default constructor. | ||||
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| Discuss Correct / Improve java constructor object creation default constructor getinstance new operator | ||||
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| Ans. Yes , using Class.getInstance. | ||||
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| Discuss Correct / Improve java oops constructor default constructor class.getinstance | ||||
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| Ans. Cloneable is a declaration that the class implementing it allows cloning or bitwise copy of it's object state. It is not having any method because it is a MARKER interface. | ||||
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| Discuss Correct / Improve java oops cloneable marker interface cloning Asked in 2 Companies | ||||
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| Ans. When you expect your code will be accessed by different threads and these threads may change a particular data causing data corruption. | ||||
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| Discuss Correct / Improve java threads multi threading synchronization concurrency basic frequent | ||||
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| Ans. Applet is a dynamic and interactive program that runs inside a web page displayed by a java capable browser. Lifecycle methods of Applet - init( ) method - Can be called when an applet is first loaded start( ) method - Can be called each time an applet is started paint( ) method - Can be called when the applet is minimized or maximized stop( ) method - Can be used when the browser moves off the applet's page destroy( ) method - Can be called when the browser is finished with the applet | ||||
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| Discuss Correct / Improve java java ui applet swing awt lifecycle of applet technologies | ||||
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| Ans. Controls are components that allow a user to interact with your application and SWT / AWT supports the following types of controls: Labels, Push Buttons, Check Boxes, Choice Lists, Lists, Scrollbars, Text Components. These controls are subclasses of Component. | ||||
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| Discuss Correct / Improve java java ui swt awt types of controls | ||||
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| Ans. It's a technique to allow multiple clients to make use of a cached set of shared and reusable connection objects providing access to a database or other resource. | ||||
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| Discuss Correct / Improve java jdbc db connectivity connection pooling architecture Asked in 3 Companies basic frequent | ||||
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| Ans. System.out and System.err both represent the monitor by default and hence can be used to send data or results to the monitor. But System.out is used to display normal messages and results whereas System.err is used to display error messages and System.in represents InputStream object, which by default represents standard input device, i.e., keyboard. | ||||
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| Discuss Correct / Improve java io system.out system.err system.in difference between advanced basic interview question | ||||
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| Ans. Open ended Questions. | ||||
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| Discuss Correct / Improve java open questions exceptions | ||||
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| Ans. Open ended Questions. | ||||
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| Discuss Correct / Improve java open questions code review documentation clean code | ||||
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| Ans. Java is a portable-language because without any modification we can use Java byte-code in any platform(which supports Java). So this byte-code is portable and we can use in any other major platforms. | ||||
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| Discuss Correct / Improve java bytecode jvm compiler portable features of java basic interview question | ||||
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| Ans. No. Every Class only needs to have one constructor - With parameters or without parameters. Compiler provides a default non parameterized constructor if no constructors is defined. | ||||
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| Discuss Correct / Improve java oops constructor default constructor yes no intermediate | ||||
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| Ans. throw is used to explicitly throw an exception especially custom exceptions, whereas throws is used to declare that the method can throw an exception. We cannot throw multiple exceptions using throw statement but we can declare that a method can throw multiple exceptions using throws and comma separator. | ||||
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| Discuss Correct / Improve java exceptions exception handling throw throws difference between basic interview question basic frequent | ||||
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| Ans. No. Even though "this" would mean a reference to current object id the method gets called using object reference but "this" would mean an ambiguity if the same static method gets called using Class name. | ||||
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| Discuss Correct / Improve java oops static this keyword this yes no why questions intermediate | ||||
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| Ans. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX/Linux like HP-Unix, Sun Solaris, Redhat Linux, Ubuntu, CentOS, etc | ||||
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| Discuss Correct / Improve java jvm platforms | ||||
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| Ans. IDE stands of Integrated Development Environment. Few Java IDE's are WSAD ( Websphhere Application Developer ) , RAD ( Rational Application Developer ) , Eclipse and Netbeans. | ||||
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| Discuss Correct / Improve java ide ide java development wsad rad eclipse netbeans | ||||
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| Ans. Object is a run time entity whose state is stored in fields and behavior is shown via methods. Methods operate on an object's internal state and serve as the primary mechanism for object-to-object communication. | ||||
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| Discuss Correct / Improve java oops objects basic interview question Asked in 1 Companies basic frequent | ||||
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Which of following can be nested into another ?
