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Questions and Answers
What is a Collection in Java?
What is a Collection in Java?
- A group of objects (correct)
- A method in Java
- A single object
- A variable type in Java
Which interface is the root interface of the Java Collection framework?
Which interface is the root interface of the Java Collection framework?
- Set
- Collection (correct)
- List
- Map
What is the key difference between List and Set in Java Collections?
What is the key difference between List and Set in Java Collections?
- Set allows duplicate elements, List doesn't
- List is unordered, Set is ordered
- List allows duplicate elements, Set doesn't (correct)
- Set is resizable, List is not
What is the key characteristic that distinguishes a Set from a List in Java Collections?
What is the key characteristic that distinguishes a Set from a List in Java Collections?
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Which interface in Java Collection framework extends the Collection interface and allows the removal of elements while iterating?
Which interface in Java Collection framework extends the Collection interface and allows the removal of elements while iterating?
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Which method in the Collection interface is used to check if a collection is empty?
Which method in the Collection interface is used to check if a collection is empty?
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Study Notes
Java Collection Framework
- A Collection in Java is a group of objects that can be manipulated independently.
Collection Interface
- The root interface of the Java Collection framework is Collection.
List and Set
- The key difference between List and Set in Java Collections is that List is ordered and allows duplicates, while Set is unordered and does not allow duplicates.
Set Characteristics
- The key characteristic that distinguishes a Set from a List in Java Collections is that Set does not allow duplicates.
Iteration and Removal
- The Iterator interface in Java Collection framework extends the Collection interface and allows the removal of elements while iterating.
Checking Emptiness
- The isEmpty() method in the Collection interface is used to check if a collection is empty.
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