Objects and Collections - General Questions Online Exam Quiz
Objects and Collections - General Questions GK Quiz. Question and Answers related to Objects and Collections - General Questions. MCQ (Multiple Choice Questions with answers about Objects and Collections - General Questions
Suppose that you would like to create an instance of a new Map that has an iteration order that is the same as the iteration order of an existing instance of a Map . Which concrete implementation of the Map interface should be used for the new instance?
Options
A : TreeMap
B : HashMap
C : LinkedHashMap
D : The answer depends on the implementation of the existing instance.
Which class does not override the equals() and hashCode() methods, inheriting them directly from class Object?
Options
A : java.lang.String
B : java.lang.Double
C : java.lang.StringBuffer
D : java.lang.Character
Which collection class allows you to grow or shrink its size and provides indexed access to its elements, but whose methods are not synchronized?
Options
A : java.util.HashSet
B : java.util.LinkedHashSet
C : java.util.List
D : java.util.ArrayList
You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order. Which interface provides that capability?
Options
A : java.util.Map
B : java.util.Set
C : java.util.List
D : java.util.Collection
Which interface does java.util.Hashtable implement?
Options
A : Java.util.Map
B : Java.util.List
C : Java.util.HashTable
D : Java.util.Collection
Which interface provides the capability to store objects using a key-value pair?
Options
A : Java.util.Map
B : Java.util.Set
C : Java.util.List
D : Java.util.Collection
Which collection class allows you to associate its elements with key values, and allows you to retrieve objects in FIFO (first-in, first-out) sequence?
Options
A : java.util.ArrayList
B : java.util.LinkedHashMap
C : java.util.HashMap
D : java.util.TreeMap
Which collection class allows you to access its elements by associating a key with an element's value, and provides synchronization?
Options
A : java.util.SortedMap
B : java.util.TreeMap
C : java.util.TreeSet
D : java.util.Hashtable
Which is valid declaration of a float?
Options
A : float f = 1F;
B : float f = 1.0;
C : float f = "1";
D : float f = 1.0d;
What is the numerical range of char?
Options
A : 0 to 32767
B : 0 to 65535
C : -256 to 255
D : -32768 to 32767
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