MCQ-4 CSE Q

Name

Roll No

Choose the correct option based on this program:

• It prints the following: The list is: [10, 20]
• It prints the following: The list is: [20, 10]
• It results in a compiler error
• It results in a runtime exception

What is the output of the following program?

• It prints the following: First type: class java.util.LinkedList Second type:class java.util.LinkedList
• It prints the following: First type: class java.util.LinkedList
• It results in a compiler error
• It results in a runtime exception

What is the output of the following program?

• [1, 2, 3]
• [1, 2]
• [2, 1]
• An exception occurs at runtime

Which of the following options can throw a NullPointerException?

• TreeSet s = new TreeSet<>(); s.add(null);
• HashMap m = new HashMap<>(); m.put(null, null);
• ArrayList arr = new ArrayList<>(); arr.add(null);
• HashSet s = new HashSet(); s.add(null);

HashSet internally uses?

• Set
• HashMap
• List
• Collection

Select the correct method that can be called on objects implementing the Map interface

• contains(Object o)
• toArray()
• values()
• addAll(Collection c)

Select the classes which have a comparator() method

• ArrayList
• HashMap
• TreeSet
• HashSet

Select the correct output of the execution of the below program:

• a,b,c,d,e
• a,b,c,d
• a,b,c,d,e,f,g
• Run time exception