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Java :

Objects and Collections




1.
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?

treemap
hashmap
LinkedHash map
The answer depends on the implementation of the existing instance




2.
Which class does not override the equals() and hashCode() methods, inheriting them directly from class Object?

java.lang.String
java.lang.Double
java.lang.StringBuffer
java.lang.Character




3.
Which collection class allows you to grow or shrink its size and provides indexed access to its elements, but whose methods are not synchronized?

java.util.HashSet
java.util.LinkedHashSet
java.util.List
java.util.ArrayList




4.
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?

java.util.Map
java.util.Set
java.util.List
java.util.Collection




5.
Which interface does java.util.Hashtable implement?

Java.util.Map
Java.util.List
Java.util.HashTable<
Java.util.Collection




6.
Which interface provides the capability to store objects using a key-value pair?

Java.util.Map
Java.util.Set
Java.util.List
Java.util.Collection




7.
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?

java.util.ArrayList
java.util.LinkedHashMap
java.util.HashMap
java.util.TreeMap




8.
Which collection class allows you to access its elements by associating a key with an element's value, and provides synchronization?

java.util.SortedMap
java.util.TreeMap
java.util.TreeSet
java.util.Hashtable




9.
Which is valid declaration of a float?

float f = 1F;
float f = 1.0;
float f = "1";
float f = 1.0d;




10.
What is the numerical range of char?

0 to 65000
0 to 65535
0 to 65585
none of the these




11.
Which of the following are Java reserved words?

run
import
default
implement

1 and 2
2 and 3
1 and 3
2 and 1










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FreshersLive - No.1 Job site in India. Here you can find latest 2016 government as well as private job recruitment notifications for different posts vacancies in India. Get top company jobs for both fresher and experienced. Job Seekers can get useful interview tips, resume services & interview Question and answer. Practice online test free which is helpful for interview preparation. Register with us to get latest employment news/rojgar samachar notifications. Also get latest free govt and other sarkari naukri job alerts daily through E-mail.