Which package below contains all the collection classes

Java MCQs on collection framework of Java Programming Language. 1. Which of these packages contain all the collection classes? a) java.lang b) java.util c) java.net d) java.awt Answer: b 2. Which of these classes is not part of Java’s collection framework? a) Maps b) Array c) Stack d) Queue Answer: a Clarification: Maps is not a part of collection framework. 3. Which of this interface is not a part of Java’s collection framework? a) List b) Set c) SortedMap d) SortedList Answer: d Clarification: SortedList is not a part of collection framework. 4. Which of these methods deletes all the elements from invoking collection? a) clear() b) reset() c) delete() d) refresh() Answer: a Clarification: clear() method removes all the elements from invoking collection. 5. What is Collection in Java? a) A group of objects b) A group of classes c) A group of interfaces d) None of the mentioned Answer: a Clarification: A collection is a group of objects, it is similar to String Template Library (STL) of C++ programming language. 6. What will be the output of the following Java program? • import java.util.* ; • class Array • a) 12885 b) 12845 c) 58881 d) 54881 • import java.util.* ; • class Bitset •

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• Collection interfaces - These interfaces represent different types of collections, such as Set, List, and Map. These interfaces form the basis of the framework. • General-purpose implementations - These are primary implementations of the collection interfaces such as ArrayList, LinkedList, HashSet, LinkedHashSet, HashMap etc. • Legacy implementations - The collection classes from earlier releases, Vector and Hashtable, were retrofitted to implement the collection interfaces. • Special-purpose implementations - Implementations designed for use in special situations such as CopyOnWriteArrayList, CopyOnWriteArraySet, EnumSet, EnumMap, WeakHashMap and IdentityHashMap etc. • Concurrent implementations - These implementations designed for highly concurrent use such as ConcurrentSkipListSet, ConcurrentHashMap, ConcurrentSkipListMap etc. • Wrapper implementations - Add functionality, such as synchronization, to other implementations. • Convenience implementations - High-performance "mini-implementations" of the collection interfaces. • Abstract implementations -Partial implementations of the collection interfaces to facilitate custom implementations such as AbstractCollection, AbstractSet, AbstractList, AbstractSequentialList and AbstractMap . • Algorithms - Static methods that perform useful functions on collections, such as sorting a list. • Infrastructure -Interfaces that provide essential support for the collection interfaces. • Array Utilities -Utility functions for arrays ...

The root interface in the collection hierarchy. A collection represents a group of objects, known as its elements. Some collections allow duplicate elements and others do not. Some are ordered and others unordered. The JDK does not provide any direct implementations of this interface: it provides implementations of more specific subinterfaces like Set and List. This interface is typically used to pass collections around and manipulate them where maximum generality is desired. Bags or multisets (unordered collections that may contain duplicate elements) should implement this interface directly. All general-purpose Collection implementation classes (which typically implement Collection indirectly through one of its subinterfaces) should provide two "standard" constructors: a void (no arguments) constructor, which creates an empty collection, and a constructor with a single argument of type Collection, which creates a new collection with the same elements as its argument. In effect, the latter constructor allows the user to copy any collection, producing an equivalent collection of the desired implementation type. There is no way to enforce this convention (as interfaces cannot contain constructors) but all of the general-purpose Collection implementations in the Java platform libraries comply. The "destructive" methods contained in this interface, that is, the methods that modify the collection on which they operate, are specified to throw UnsupportedOperationException if th...

This Quiz consists of Collection's 150 Multiple choice questions in 6 sets - Java Collection quiz - MCQ Contents of page > Note : Each set consists of 25 questions Each set consists of 5 EASY level difficulty questions 1 mark each. 1 * 5 = 5 marks Each set consists of 10 MEDIUM level difficulty questions 2 mark each. 2 * 10 = 20 marks Each set consists of 10 HARD level difficulty questions 3 mark each. 3 * 10 = 30 marks So, each Set is TOTAL of 55 marks This quiz have been designed to check beginners and experienced Java developers skills. Scoring below 15 marks means POOR : You are Java Beginner and need to work very hard. Scoring 15-34 marks means AVERAGE : You know Java basics, but you need more practice. Scoring 35-50 marks means GOOD : You have good Java knowledge. Scoring above 50 marks means EXCELLENT : You have outstanding java knowledge. Collection Java - MCQ set 1 (25 questions, 55 marks) Q1 - Q5, 5 EASY level difficulty questions 1 mark each. 1 * 5 = 5 marks • Which of these is not a interface in the Collections Framework? a. Collection b. Group c. Set d. List • Which interface restricts duplicate elements? a. Set b. List c. Map d. (All of these) • Which of these collection class has the ability to grow dynamically? a. Array b. Arrays c. ArrayList d. (None of these) • The accuracy and efficiency of a HashMap can be guaranteed with: a. override equals method b. override hashCode method c. (None of these) d. (All of these) • A HashMap allows the existence of: a. n...

Collection Framework was not part of the original Java release but was added by J2SE 1.2. Prior to the Collection Framework, Java provided ad hoc classes such as Dictionary, Vector, and Stack to store and manipulate groups of objects. The collection framework can be represented using the hierarchical model below. Throughout this article, we will discuss the classes and interfaces mentioned above; the methods available to support handling the group of objects and which one should be used at specific use cases. What is the difference between Collection, Collection Framework & Collections in JAVA? Before we proceed to discuss individual classes & interfaces of collection framework, let us have a clear understanding of these terminologies to avoid any confusion. Collection – In any programming language or real life, a Collection is a group of objects (similar or different). In JAVA, Collection is an Collection Framework – Collection Framework in JAVA (as we are focusing on JAVA) is a hierarchical representation of classes and interfaces which provide the framework to deal with a group of objects. Group of objects can be a group of Strings or Integers, or a group of Objects of a particular class etc. Collections – Collections is a utility class present in java.util package. It defines several utility methods like sorting and searching which are used to operate on collection. All the methods inside Collections class are static. Explain the collection framework hierarchy. W...

This question hasn't been solved yet Ask an expert Ask an expert Ask an expert done loading Question:A Java package is collection of related classes. Within the JDK, the java.io package contains classes that support and perform input and output. The java.util.regex package contains classes for working with regular expressions (text pattern matching: https://en.wikipedia.org/wiki/Regular_expression) Refactoring is the process of reorganizing an existing body A Java package is collection of related classes. Within the JDK, the java.io package contains classes that support and perform input and output. The java.util.regex package contains classes for working with regular expressions (text pattern matching: https://en.wikipedia.org/wiki/Regular_expression) Refactoring is the process of reorganizing an existing body of source code. Seldom do we have the best view of the layout of a project at the beginning of a project as we have at then end of the project. There times when we say, "Well it would have been better if I had done it this way instead of that way." This is normal. When we have the opportunity, we can refactor our code so that it has a better, more meaningful structure or organization. That is what we are going to do in this lab. Step 1: Creating Separate Class Files If you wrote your Lab 8 code and put all of your classes into a single file, that was fine for Lab 8 but now we are going to separate the classes out into their own files. Refactor your code, placing eac...