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Right choice is (c) When designing your own collections class (say, a linked list), GENERICS and parameterized types ALLOW you to achieve type SAFETY with just a single class definition as opposed to defining multiple classes

The BEST explanation: None.

The correct choice is (b) class name { /* … */ }

The BEST I can EXPLAIN: The type parameter SECTION, delimited by angle brackets (<>), FOLLOWS the class name. It specifies the type parameters (also called type variables) T1, T2, …, and Tn.

Correct choice is (c) Generics add STABILITY to your code by making more of your BUGS DETECTABLE at compile TIME

For EXPLANATION: Generics add stability to your code by making more of your bugs detectable at compile time.

Correct CHOICE is (C) ReflectPermission

To elaborate: The ReflectPermission class allows reflection of private or PROTECTED members of a class. This was added after JAVA 2.0 .

The correct CHOICE is (a) java.SECURITY

To elaborate: java.security handles certificates, keys, digests, signatures, and other security functions.

Correct choice is (B) False

Explanation: No, Constructor, STATIC INITIALIZATION Block, INSTANCE Initialization Block and VARIABLES cannot be abstract.

Right OPTION is (d) The interfaceName.variableName needs to be defined

Easy EXPLANATION: The JVM needs to distinctly KNOW which value of VARIABLE it needs to use. To AVOID confusion to the JVM interfaceName.variableName is mandatory.

Right answer is (c) COMPILATION failure

The best explanation: The METHODS of interfaces are ALWAYS abstract. They PROVIDE only METHOD definition.

Right choice is (a) abstract

Explanation: By default, interface CONTAINS abstract METHODS. The abstract methods need to be implemented by concrete CLASSES.

The correct choice is (a) True

For explanation I WOULD say: CONCRETE classes must IMPLEMENT all methods in an interface. Through interface multiple inheritance is possible.

Correct OPTION is (d) STATIC final

To explain: variable DEFINED in an interface is implicitly final and static. They are usually written in capital LETTERS.

The correct answer is (B) class B IMPLEMENTS A{}

Easiest EXPLANATION: Concrete class implements an interface. They can be instantiated.

The correct option is (a) Protected

To explain: Interface can have EITHER public ACCESS SPECIFIER or no specifier. The REASON is they NEED to be implemented by other classes.

The CORRECT choice is (B) class manager IMPLEMENTS SALARY {}

To EXPLAIN I would say: None.

Right choice is (C) implements

To explain I would say: interface is inherited by a CLASS using implements.

The CORRECT answer is (a) Public

Explanation: Access specifier of an interface is EITHER public or no specifier. When no access specifier is used then default access specifier is used due to which interface is available only to other MEMBERS of the package in which it is DECLARED, when declared public it can be used by any CODE.

The CORRECT CHOICE is (a) Public

The BEST EXPLANATION: NONE.

Right choice is (c) IMPORT PKG.*

For explanation I would say: Operator * is USED to import the ENTIRE PACKAGE.

Right option is (b) Packages

Easy explanation: Packages are both naming and visibility control mechanism. We can define a CLASS INSIDE a package which is not accessible by code OUTSIDE the package.