Java Collections Interview Questions and Answers
Here you can find Java Collections Interview Questions and Answers.
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Java Collections Interview Questions and Answers
What are limitations of object Arrays?
The main limitations of Object arrays are
1. These are fixed in size ie once we created an array object there is no chance of increasing or decreasing size based on our requirement.
2. Hence If we don’t know size in advance , arrays are not recommended to use
3. Arrays can hold only homogeneous elements.
4. There is no underlying data structure for arrays and hence no readymade method support for arrays.
5. Hence for every requirement programmer has to code explicitly
6. To over come these problems collections are recommended to use
Java Collections Interview Questions and Answers
What is Collection API ?
It defines set of classes and interfaces which can be used for representing a group of objects as single entity
Java Collections Interview Questions and Answers
What is Collection framework?
It defines set of classes and inter faces which can be used for representing a group of objects as single entity
Java Collections Interview Questions and Answers
What is difference between Collections and Collection?
Collection is an interface which can be used for representing a group of individual objects as single entity and it acts as root interface of collection frame work.
Collections is an utility class to define several utility methods for Collection implemented class objects.
Java Collections Interview Questions and Answers
Explain about Collection interface?
* This interface can be used to represent a group of objects as a single entity.
* It acts as root interface for entire collection framework.
* It defines the most commonly used methods which can be applicable for any collection implemented class object
Java Collections Interview Questions and Answers
Explain about List interface?
List interface is a child interface of Collection interface. This can be used to represent group of individual objects in as a single entity where
Duplicates are allowed
Insertion order is preserved
Java Collections Interview Questions and Answers
Explain about Set interface?
Set is a child interface of Collection interface. it can be used to represent a group of individual objects as a single entity where
Duplicate objects are not allowed.
Insertion order is not preserved
Java Collections Interview Questions and Answers
Explain about SortedSet interface?
it is child interface of Set interface. it can be used to represent a group of individual objects in to a single entity where All the objects are arranged in some sorting order (Can
be natural sorting order or customizede).
Duplicates are not allowed.
Java Collections Interview Questions and Answers
Explain about NavigableSet ?
It is child interface of SortedSet and provides several utility methods for navigation purposes
It doesn’t allows duplicates
Insertion order is preserved
It is introduced in 1.6 version
Java Collections Interview Questions and Answers
Explain about Queue interface?
If we want to represent a group of individual objects prior to processing, then we should go for Queue interface. It is child interface of Collection interface.
It has introduced in 1.5 version.
