Multiple Choice Question

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Submitted by c-admin on Wed, 05/29/2019 - 05:47

QID:

238

Type:

Multiple Choice Question

Category:

Java Programmer I

Tags:

ArrayList

Question:

Given:

import java.util.*;
public class TestClass {
    public static void main(String[] args) throws Exception {
        ArrayList&lt;Double&gt; al = new ArrayList&lt;&gt;();
        //INSERT CODE HERE
     }
}

What can be inserted in the above code so that it can compile without any error?

Select 3 options

A. al.add (111);
B. System.out.println (al.indexOf (1.0));
C. System.out.println (al.contains ("string"));
D. Double d = al.get (al.length);
E. al.notifyAll();

Answer and Explanation (Click to expand)

Answer:

B, C, E

Explanation:

B - 1.0 is a double and so it can be boxed into a Double object.

E - Since notifyAll() method is a part of Object class, it can be called on any object. Though it will throw an Illegal Monitor State Exception at runtime because this method must be called if you have acquired a lock on that object. Please note that although not specifically mentioned in the objectives, some candidates have reported getting an option referring to this method. That is why we have included it.

Q&A Set:

Set 31

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