Java

Level:-Basic
Q(1)	interface is a valid keyword in Java.
A	True
B	False
Q(2)	Which one of the following will declare an array and initialize it with five numbers?
A	Array a = new Array(5);
B	int [] a = {23,22,21,20,19};
C	int a [] = new int[5];
D	int [5] array;
Level:-Intermediate
Q(1)	Which is the valid declarations within an interface definition?
A	public double methoda();
B	public final double methoda();
C	static void methoda(double d1);
D	None of these
Q(2)	Which of these causes a compiler error?
A	int[ ] scores = {3, 5, 7};
B	int [ ][ ] scores = {2,7,6}, {9,3,45};
C	String cats[ ] = {"Fluffy", "Spot", "Zeus"};
D	None of these
Level:-Expert
Q(1)	Which concrete implementation of the Map interface should be used for the new instance?
A	TreeMap
B	HashMap
C	LinkedHashMap
D	None of the above
Q(2)	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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