Question 46 :
What is the difference between preemptive scheduling and time slicing?
Under preemptive scheduling, the highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence. Under time slicing, a task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.
Question 47 :
Name three Component subclasses that support painting.
The Canvas, Frame, Panel, and Applet classes support painting.
Question 48 :
What value does readLine() return when it has reached the end of a file?
The readLine() method returns null when it has reached the end of a file.
Question 49 :
What is the immediate superclass of the Dialog class?
Question 50 :
What is clipping?
Clipping is the process of confining paint operations to a limited area or shape.