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Collections and Generics

Question : 12 of 53

Marks: +1, -0

Given:

Given:1. import java.util.*; 
2. class A {} 
3. class B extends A { } 
4. public class Test {  
5.   public static void main (String[ ] args) { 
6.    List < A > listA = new LinkedList < A > (); 
7.    List < B > listB = new LinkedList < B > (); 
8.    List < Object > listO = new LinkedList < Object > (); 
9.   /* insert code here*/ 
10 . } 
11. public static void ml(List < ? extends A > list) { } 
12. public static void m2(List < A > list) { } 
13. }

Method calls	Result
1. `m1(listA);`	A) Does not compile
2. `m1(listB);`	B) Compiles and runs without error
3. `m1(listO);`	C) An exception is thrown at runtime
4. `m2(listA);`
5. `m2(listB);`
6. `m2(listO);`

5 - c , 6 - a , 4 - b
3 - a , 5 - a , 6 - a
1 - b , 2 - b , 4 - b
1- c , 2 - b , 3 - a

Validate

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