Java Programming: Collections, Annotations, and Enums

The answer is correct. MIN_NORMAL is the constant variable that is not present in Long wrapper class. Instead it is present in Float and Double classes, which will return the minimum positive normal value.

This answer is correct. Iterator interface is used to obtain elements from the collection in forward direction only. ListIterator is used to obtain elements from the collection in bi-directional direction only.

This answer is correct. Long, Byte, Short, Integer classes do have the decode method which will return the respective Class object like Long, Byte, Short, Integer based on the call from the respective classes. Also,  the object that is returned contains the value specified by the string.

This answer is correct. MAX_RADIX is related to the character class since it gets the largest radix of the character sequence.

This answer is correct. HashMap allows null in the key value pairs. It can have null in the key as well as values. Hashtable does not allow null in the key value pairs. It will not have any null in the key or value pairs.

This answer is correct. HashMap is not thread-safe or synchronized. In other words, HashMap is non-synchronized. So, the key value pair is not thread-safe. Hashtable is thread-safe or synchronized.The key value pair will not be affected by different threads.

This answer is correct. Vector is a part of Collections family. Unlike other classes, the default size of Vector is 10.
 

This answer is correct. The other name for annotation is metadata. But the term annotation is the most commonly used word.

This answer is correct. The enumeration constant's position in the list of constants is called ordinal value. This gives the position of constants from the list of enumeration constants.

This answer is correct. All annotation types extend the Annotation interface which is from java.lang.annotation package. Annotation is a super-interface of all annotations.

This answer is correct. The class java.lang. Enum exists in java.lang package. Also, all enumerations inherit java.lang.Enum superclass. This class defines several methods that are available for use by all enumerations.

This answer is correct. Enum do not need to be instantiated using the new keyword. Enum can have constructors and it will be called whenever the enum object is referred.

This answer is correct. Ordinal values in the list of enumeration always begins from zero.

This answer is correct. An enumeration cannot inherit any other class. The enum cannot be extended, and no other class can inherit enum class. In other words, enum can never be a super class.

This answer is correct. Iterator is used to obtain the elements from the collection in forward direction only. Also, it has the capability to remove the elements from the collection. List Iterator is used to obtain the elements from the collection in forward direction only. Also, it has the capability to modify the elements in the collection.