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SCJP Module-9 Question-10

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The given program will test your knowledge of Queue Interface and LinkedList class of the collection framework.

Given below the sample code :

import java.util.LinkedList;
import java.util.Queue;
public class Check {
public static void main(String... args) {
Queue<String> que = new LinkedList<String>();
que.add("Delhi");
que.add("Mumbai");
que.add("Dhaka");
show(que);
}
public static void show(Queue q) {
que.add(new Integer(12));
while (!que.isEmpty ( ) )
System.out.print(que.poll() + " ");
}
}

What will be the output of the above code ?

1. Compile error

2. Delhi  Mumbai  Dhaka  12

3.  Delhi  Mumbai  Dhaka

4.  Delhi  Mumbai 

Answer

(2)

Explanation

The 'que' was declared as Queue<String> originally . But it is passed as an untyped Queue in show() method ,after that it is legal to add ineger.

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