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| 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 |
