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  Home Placement Paper Kit Technical Questions ► Java ▼

41.What is the base class of all exceptions?

42.What kind of thread is the Garbage collector thread?

43. What is the major difference between LinkedList and ArrayList?

44. When can an object reference be cast to an interface reference?

45.What is the return type of a program's main() method?

46. Name the eight primitive Java types.

47.How to compare two strings ?

48.What is meant by event handling ?

49. What is the difference between a scroll bar and a scroll panel.

50. What is meant by controls and types ?

51. What are all the listeners in java and explain ?

52. What is the default layout of the panel and frame ?

53.What is the difference between panel and frame ?

54. What are the types of mouse event listeners ?

55. What is meant by an adapter class ?

56.What is the difference between getAppletInfo and getParameterInfo ?

57. What is meant by getCodeBase and getDocumentBase method ?

58. How can you find the length and capacity of a string buffer ?

59. What is the difference between sleep and suspend ?

60.How do you send a message to the browser in JavaScript ?

61. When you navigate from one applet to another what are the methods called?

62.When is init(),start() called ?

63. What's the difference between an interface and an abstract class?

64.What is reflect package used for & the methods of it.

65.Difference between Unicast & Multicast model

66. What is meant by Serialisation and Deserialisation?

67.What is DGC? And how does it work?

68. How to get all the registered objects in a rmiregistry?

69. Describe the lifecycle of a basic servlet - for instance, when are they created? What method is called from a typical HTTP request? What about requests and threads?

70. Explain Lifecycle of the Applet and what is the order of method invocation in an applet?

71. What situations are best suitable for implementing assertions?

72. An application has a lot of threads and is running out of memory, why?

73. Should one pool objects to help Garbage Collector?Should one call System.gc() periodically?

74. Can you call one constructor from another if a class has multiple constructors

75.Can a for statement loop indefinitely?

76. What is the difference between the prefix and postfix forms of the ++ operator?

77. What is the difference between a while statement and a do statement?

78. Is the ternary operator written x : y ? z or x ? y : z ?

79.Can an anonymous class be declared as implementing an interface and extending a class?

80.How will you load a specific locale?


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