Technical Questions

97. What are the legal operands of the instanceof operator? The left operand is an object reference or null value and the right operand is a class, interface, or array …

91. Name the eight primitive Java types. The eight primitive types are byte, char, short, int, long, float, double, and boolean.

85. 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 …

79. 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 …

73. What do you understand by private, protected and public? These are accessibility modifiers. Private is the most restrictive, while public is the least restrictive. There is no real difference …

67. Which non-Unicode letter characters may be used as the first character of an identifier? The non-Unicode letter characters $ and _ may appear as the first character of an …

61. Can a Byte object be cast to a double value? No, an object cannot be cast to a primitive value. 62. What is the difference between a static and …

55. What is Externalizable? Externalizable is an Interface that extends Serializable Interface. And sends data into Streams in Compressed Format. It has two methods, writeExternal(ObjectOuput out) and readExternal(ObjectInput in)

49. Why is an Interface be able to extend more than one Interface but a Class can’t extend more than one Class? Basically Java doesn’t allow multiple inheritance, so a …

43. Class C implements Interface I containing method m1 and m2 declarations. Class C has provided implementation for method m2. Can i create an object of Class C? No not …