java collections

What is Collection in Java?

• A group of objects

• A group of classes

• A group of interfaces

• None of the mentioned

Which of these interface is not part of Java’s collection framework?

• List

• Sorted List

• Set

• Sorted Map

 What will be the output of the  Java program?

• {0, 1, 3, 4}

• {0, 1, 2, 4}

• {0, 1, 2, 3, 4}

• {0, 0, 0, 3, 4}

Which of these return type of hasNext() method of an iterator?

• Integer

• Double

• Boolean

• Collections Object

Which of these exceptions is thrown by remover() method?

• IOException

• SystemException

• ObjectNotFoundExeception

• IllegalStateException

Which of these methods deletes all the elements from invoking collection?

• clear();

• reset();

• delete();

• remove();

Which of these interface declares core method that all collections will have?

• Collection

• EventListner

• Comparator

• Set

• List

Which of these is an incorrect form of using method max() to obtain maximum element?

• max(Collection c)

• max(Collection c, Comparator comp)

• max(Comparator comp)

• max(List c)

Which of these methods can convert an object into a List?

• SetList()

• ConvertList()

• CopyList()

• singletonList()

Which of these is true about unmodifiableCollection() method?

• unmodifiableCollection() returns a collection that cannot be modified.

• unmodifiableCollection() method is available only for List and Set.

• unmodifiableCollection() is defined in Collection class.

• None of the mentioned.