April 2016

1. What is the difference between a constructor and a method? A constructor is a member function of a class that is used to create objects of that class. It …

27. 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 …

121. To what value is a variable of the String type automatically initialized? The default value of an String type is null. 122. What is the difference between a field …

115. What is constructor chaining and how is it achieved in Java ? A child object constructor always first needs to construct its parent (which in turn calls its parent …

109. What is the difference between an if statement and a switch statement? The if statement is used to select among two alternatives. It uses a boolean expression to decide …

103. What is the difference between a public and a non-public class? A public class may be accessed outside of its package. A non-public class may not be accessed outside …

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 …