-
Can an unreachable object become reachable again
An unreachable object may become reachable again. This can happen when the object'sfinalize() method is invoked and the object performs an operation which causes it tobecome accessible to reachable objects.
-
What are three ways in which a thread can enter the waiting state
A thread can enter the waiting state by invoking its sleep() method, by blocking on I/O,by unsuccessfully attempting to acquire an object's lock, or by invoking an object's wait()method. It can also enter the waiting state by invoking its (deprecated) suspend() method.
Sandhya.Kishan
- Jul 14th, 2012
A thread can enter the waiting state by invoking wait() method, sleep() method and suspend() method.
-
What happens when you invoke a thread's interrupt method while it issleeping or waiting
When a task's interrupt() method is executed, the task enters the ready state. The nexttime the task enters the running state, an InterruptedException is thrown.
Sandhya.Kishan
- Jul 14th, 2012
Java.lang.InterruptedException is called when we invoke a threads interrupt method while it is sleeping.
-
Java Copy Command
Write the Java version of MS DOS Copy Command
Sandhya.Kishan
- Jul 13th, 2012
The command FileUtils.copyFile(fOrig, fDest); is similar to ms ds copy command.
-
What method is invoked to cause an object to begin executing as a separate thread
The start() method of the Thread class is invoked to cause an object to begin executing asa separate thread.
Sandhya.Kishan
- Jul 13th, 2012
The start() method is invoked to cause an object to begin executing as a separate thread.
-
Which Container method is used to cause a container to be laid out and redisplayed
Validate()
Sandhya.Kishan
- Jul 13th, 2012
Validate() method is used to cause a container to be laid out and redisplayed in java programming.
-
Which swing components are synchronized?
Sandhya.Kishan
- Jul 13th, 2012
The repaint(), revalidate(), and invalidate() methods are synchronised.
-
What can a method do with a checked exception?
Sandhya.Kishan
- Jul 13th, 2012
With a checked exception a method can either throw an exception to the method which calls it or it can handek the exception in the catch block.
-
Encapsulation and data abstraction in Java
Can somebody tell me what is the example of encapsulation , data abstraction & polymorphism?
-
What is binding in Java ?
Rohit Verma
- Jun 24th, 2012
Binding in java is between an object and its methods/variables. It can happen either at compile time( method overloading / normal call ) or at run time ( method override ).
-
What happens if an exception is not caught
An uncaught exception results in the uncaughtException() method of the thread'sThreadGroup beinginvoked, which eventually results in the termination of the program in which it is thrown.
Sandhya.Kishan
- Jun 23rd, 2012
If the exception is not caught by any of the method in the methods stack , then the main method throws that exception and the JVM halts its execution.
-
How are this and super used
This is used to refer to the current object instance. super is used to refer to the variablesand methods of thesuperclass of the current object instance.
Sandhya.Kishan
- Jun 23rd, 2012
This() is used to refer the class scope variables. and method scope variables and it is used to invoke a constructor of the same class.
super() is used to refer super-class member and subclass member and it invoke a super-class constructor. -
Can an object's finalize() method be invoked while it is reachable
An object's finalize() method cannot be invoked by the garbage collector while the objectis still reachable.However, an object's finalize() method may be invoked by other objects.
Sandhya.Kishan
- Jun 19th, 2012
The reachable objects cannot be garbage collected and hence an objects finalize() method cannot be invoked while it is reachable.
-
Can u read all elements from an array?
Sandhya.Kishan
- Jun 19th, 2012
Reading elements from an array depends on the type of data that we want to read from an array,if the array is a linked list or stack or a queue it is not possible to read all the elements but if the array is fo a prmitive data typr then it is possible to read all the elements,
-
If service method is used then doGet() and doPost() stand for what?
Sandhya.Kishan
- Jun 19th, 2012
We use doGet() when you want to intercept on HTTP GET requests.The servlet doGet() is used to preprocess a request.Ex:doing some business stuff before displaying the JSP page, such as gathering data f...
-
How to kill a thread?
Sandhya.Kishan
- Jun 19th, 2012
The Thread.stop() method can be used to kill a thread but it is unsafe and thus deprecated.
Other way would be to have a variable indicating if the thread should be stopped. Other threads may set the variable to make the thread stop. Then, the thread itself may clean up and stop. -
What is the ResourceBundle class
The ResourceBundle class is used to store locale-specific resources that can be loaded bya program totailor the program's appearance to the particular locale in which it is being run.
Sandhya.Kishan
- Jun 15th, 2012
ResourceBundle is a set of related subclasses that share the same base name.It can be used instead of the Properties class. It is useful when developing applications for different languages,the Resour...
-
What are three ways in which a thread can enter the waiting state
A thread can enter the waiting state by invoking its sleep() method, by blocking on I/O,by unsuccessfullyattempting to acquire an object's lock, or by invoking an object's wait() method. It canalso enter thewaiting state by invoking its (deprecated) suspend() method.
Sandhya.Kishan
- Jun 15th, 2012
The thread can enter its waiting state by
1.invoking its sleep() method
2.By invoking its suspend() method
3.When an i/o block occurs. -
What is the purpose of garbage collection
The purpose of garbage collection is to identify and discard objects that are no longerneeded by a programso that their resources may be reclaimed and reused.
Sandhya.Kishan
- Jun 15th, 2012
The purpose of garbage collection is to remove the unused variables/objects (value is null) from the memory,so that their resources can be reclaimed and reused by other programs.
-
Java is Architectural _____________
A) DependentB) NeutralC) IndependentD) None of the above
sudheer
- Jun 15th, 2012
Architectural neutral
Java Interview Questions
Ans