Objects that subclass the Observable class maintain a list of observers. When anObservable object is updated it invokes the update() method of each of its observers tonotify the observers that it has changed
Latest Answer : Observer observe only those class which are Observable. ...
The List interface provides support for ordered collections of objects.
Latest Answer : The list interface extends Collection and declares the behaviour of a collection that stores a sequence of elements. Elements can be inserted or accessed by their position in the list, using a Zero-based index. Alist may contain duplicate elements. ...
The >> operator carries the sign bit when shifting right. The >>> zero-fills bits that havebeen shifted out.
Latest Answer : While dealing with (+)ve numbers there is no difference between >>> and >> operators.Both operators shift zeros into the upper bits of a number.The difference arises when dealing with (-)ve numbers.Since (-)ve numbers,(-)ve numbers have ...
When a task invokes its yield() method, it returns to the ready state. When a task invokesits sleep() method, it returns to the waiting state.
Latest Answer : yield method is mainly used to release the lock of resource and pull up in to steady state from wait pool. Sleep() will pull the thread to sleep for the given time. It will throws exception while trying to intrupt in b/w the sleep state ...
Under preemptive scheduling, the highest priority task executes until it enters the waitingor dead states or a higher priority task comes into existence. Under time slicing, a taskexecutes for a predefined
Latest Answer : 1. Pre-emptive Scheduling.Ways for a thread to leave running state -· It can cease to be ready to execute ( by calling a blocking i/o method)· ...
The CheckboxMenuItem class extends the MenuItem class to support a menu item thatmay be checked or unchecked.
If an expression involving the Boolean & operator is evaluated, both operands areevaluated. Then the & operator is applied to the operand. When an expression involvingthe && operator is evaluated, the
Latest Answer : & -> for bitwise operation&&-> for logical comparison ...
Name three subclasses of the Component class.Box.Filler, Button, Canvas, Checkbox, Choice, Container, Label, List, Scrollbar, orTextComponent
A break statement results in the termination of the statement to which it applies (switch,for, do, or while). A continue statement is used to end the current loop iteration andreturn control to the loop
Latest Answer : The break keyword halts the execution of the current loop and forces control out of the loop. The continue is similar to break, except that instead of halting the execution of the loop, it starts the next iteration. ...
A non-static inner class may have object instances that are associated with instances ofthe class's outer class. A static inner class does not have any object instances.
Latest Answer : The static inner classes can be accessed with out creating it's objects or we can access static inner classes with direct class name but in the case of non-static inner classes access we have to create the object of that class. ...
