1. Question: 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? 

    A
    TreeMap

    B
    HashMap

    C
    LinkedHashMap

    D
    The answer depends on the implementation of the existing instance.


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

    A
    java.lang.String

    B
    java.lang.Double

    C
    java.lang.StringBuffer

    D
    java.lang.Character


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

    A
    java.util.HashSet

    B
    java.util.LinkedHashSet

    C
    java.util.List

    D
    java.util.ArrayList


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  4. Question: 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? 

    A
    java.util.Map

    B
    java.util.Set

    C
    java.util.List

    D
    java.util.Collection


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

    A
    Java.util.Map

    B
    Java.util.List

    C
    Java.util.HashTable

    D
    Java.util.Collection


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

    A
    Java.util.Map

    B
    Java.util.Set

    C
    Java.util.List

    D
    Java.util.Collection


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  7. Question: 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? 

    A
    java.util.ArrayList

    B
    java.util.LinkedHashMap

    C
    java.util.HashMap

    D
    java.util.TreeMap


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

    A
    java.util.SortedMap

    B
    java.util.TreeMap

    C
    java.util.TreeSet

    D
    java.util.Hashtable


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  9. Question: Which is valid declaration of a float? 

    A
    float f = 1F;

    B
    float f = 1.0;

    C
    float f = "1";

    D
    float f = 1.0d;


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  10. Question:
    /* Missing Statement ? */
    public class foo 
    {
        public static void main(String[]args)throws Exception 
        {
            java.io.PrintWriter out = new java.io.PrintWriter(); 
            new java.io.OutputStreamWriter(System.out,true); 
            out.println("Hello"); 
        } 
    }
    
    What line of code should replace the missing statement to make this program compile? 

    A
    No statement required.

    B
    import java.io.*;

    C
    include java.io.*;

    D
    import java.io.PrintWriter;


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