| | | | | | MCQ Tutorial - JAVA->Collection | | | | | | 1.) 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 are: | | | A.) java.util.List
| | | B.) java.util.Set
| | | C.) java.util.Collection
| | | D.) java.util.Map
| | | | Correct Option: B | | | | | | | | | | | 2.) 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 are: | | | A.) java.util.ArrayList
| | | B.) java.util.LinkedHashSet
| | | C.) java.util.HashSet
| | | D.) java.util.List
| | | | Correct Option: A | | | | | | | | | | 3.) Which class does not override the equals() and hashCode() methods, inheriting them directly from
class Object?
| | | | Options are: | | | A.) java.lang.StringBuffer
| | | B.) java.lang.Double
| | | C.) java.lang.String
| | | D.) java.lang.Character
| | | | Correct Option: A | | | | | | | | | | 4.) 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 are: | | | A.) The answer depends on the implementation of the existing instance
| | | B.) HashMap
| | | C.) TreeMap
| | | D.) LinkedHashMap
| | | | Correct Option: D | | | | | | | | | | | 5.) Which interface does java.util.Hashtable implement?
| | | | Options are: | | | A.) Java.util.Collection
| | | B.) Java.util.Map
| | | C.) Java.util.List
| | | D.) Java.util.HashTable
| | | | Correct Option: B | | | | | | | | |
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