Q31. Which containers use a FlowLayout as their default layout?
The Panel and Applet classes use the FlowLayout as their default layout.
Q32. What state does a thread enter when it terminates its processing?
When a thread terminates its processing, it enters the dead state.
Q33. What is the Collections API?
The Collections API is a set of classes and interfaces that support operations on collections of objects.
Q34. Which characters may be used as the second character
of an identifier, but not as the first character of an identifier?
The digits 0 through 9 may not be used as the first character of an identifier but they may be used after the first character of an identifier.
Q35. What is the List interface?
The List interface provides support for ordered collections of objects.
Q36. How does Java handle integer overflows and underflows?
It uses those low order bytes of the result that can fit into the size of the type allowed by the operation.
Q37. What is the Vector class?
The Vector class provides the capability to implement a growable array of objects
Q38. What modifiers may be used with an inner class that is a member of an outer class?
A (non-local) inner class may be declared as public, protected, private, static, final, or abstract.
Q39. What is an Iterator interface?
The Iterator interface is used to step through the elements of a Collection.
Q40. What is the difference between the >> and >>> operators?
The >> operator carries the sign bit when shifting right. The >>> zero-fills bits that have been shifted out.
Q41. Which method of the Component class is used to set the position and size of a component?
Q42. How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8 characters?
Unicode requires 16 bits and ASCII require 7 bits. Although the ASCII character set uses only 7 bits, it is usually represented as 8 bits. UTF-8 represents characters using 8, 16, and 18 bit patterns. UTF-16 uses 16-bit and larger bit patterns.
Q43. What is the difference between yielding and sleeping?
When a task invokes its yield() method, it returns to the ready state. When a task invokes its sleep() method, it returns to the waiting state.
Q44. Which java.util classes and interfaces support event handling?
The EventObject class and the EventListener interface support event processing.
Q45. Is sizeof a keyword?
The sizeof operator is not a keyword.
Q46. What are wrapped classes?
Wrapped classes are classes that allow primitive types to be accessed as objects.
Q47. Does garbage collection guarantee that a program will not run out of memory?
Garbage collection does not guarantee that a program will not run out of memory. It is possible for programs to use up memory resources faster than they are garbage collected. It is also possible for programs to create objects that are not subject to garbage collection
Q48. What restrictions are placed on the location of a package statement within a source code file?
A package statement must appear as the first line in a source code file (excluding blank lines and comments).
Q49. Can an object’s finalize() method be invoked while it isreachable?
An object’s finalize() method cannot be invoked by the garbage collector while the object is still reachable. However, an object’s finalize() method may be invoked by other objects.
Q50. What is the immediate superclass of the Applet class?
Q51. 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.
Q52 Name three Component subclasses that support painting.
The Canvas, Frame, Panel, and Applet classes support painting.
Q53. 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.
Q54. What is the immediate superclass of the Dialog class?
Q55. What is clipping?
Clipping is the process of confining paint operations to a limited area or shape.
Q56. What is a native method?
A native method is a method that is implemented in a language other than Java.
Q57. Can a for statement loop indefinitely?
Yes, a for statement can loop indefinitely. For example, consider the following: for(;;) ;
Q58. What are order of precedence and associativity, and how are they used?
Order of precedence determines the order in which operators are evaluated in expressions. Associatity determines whether an expression is evaluated left-to-right or right-to-left
Q59. When a thread blocks on I/O, what state does it enter?
A thread enters the waiting state when it blocks on I/O.
Q60. To what value is a variable of the String type automatically initialized?
The default value of an String type is null.
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