Java/Java Mcq Question Set 6 Sample Test,Sample questions

Question:
 Which of these are legacy classes?

1.Vector

2.Hashtable

3.Stack

4.All of the above


Question:
 Which of these is a method of ObjectInput interface used to deserialize an object from a stream?

1.Object WriteObject()

2.void close()

3.Object readObject()

4.int read()


Question:
All of the above

1.HashMap

2.Enumeration

3.Hashtable

4.Map


Question:
What is the name of data member of class Vector which is used to store number of elements in the vector?

1.elements

2.elementCount

3.length

4.capacity


Question:
Which of these class can generate an array which can increase and decrease in size automatically?

1.DynamicsList()

2.DynamicList()

3.ArrayList()

4.LinkedList()


Question:
Which of these class extend InputStream class?

1.ObjectInputStream

2.ObjectStream

3.ObjectInput

4.ObjectOutput


Question:
Which of these class object can be used to form a dynamic array?

1.ArrayList

2.Map

3.Both a & b

4.Vector


Question:
Which of these class object has architecture similar to that of array?

1.Hashtable

2.Bitset

3.Map

4.All of the above


Question:
Which of these class object uses key to store value?

1.Dictionary

2.Map

3.Hashtable

4.All of the above


Question:
Which of these classes implements Set interface?

1.LinkedList

2.DynamicList

3.HashSet

4.ArrayList


Question:
Which of these classes provide implementation of map interface?

1.LinkedList

2.HashMap

3.ArrayList

4.DynamicList


Question:
Which of these interface extends DataInput interface?

1.Serializable

2.ObjectInput

3.Externalization

4.ObjectOutput


Question:
Which of these interface extends DataOutput interface?

1.Externalization

2.Serializable

3.ObjectInput

4.ObjectOutput


Question:
Which of these is a class which uses String as a key to store the value in object?

1.ArrayList

2.Properties

3.Dictionary

4.Array


Question:
Which of these is a method of class Date which is used to search weather object contains a date before the specified date?

1.contains()

2.after()

3.compareTo()

4.before()


Question:
Which of these is a method of ObjectOutput interface used to finalize the output state so that any buffers are cleared?

1.flush()

2.close()

3.fflush()

4.clear()


Question:
Which of these is a process of extracting/removing the state of an object from a stream?

1.Externalization

2.Deserialization

3.Serialization

4.File Filtering


Question:
Which of these is a process of writing the state of an object to a byte stream?

1.Externalization

2.Serialization

3.File Filtering

4.All of the above


Question:
Which of these is an interface for control over serialization and deserialization?

1.Externalization

2.Serializable

3.FileFilter

4.ObjectInput


Question:
Which of these is method of ObjectOutput interface used to write the object to input or output stream as required?

1.StreamWrite()

2.writeObject()

3.Write()

4.write()


Question:
Which of these is the interface of legacy is implemented by Hashtable and Dictionary classes?

1.Map

2.HashMap

3.Hashtable

4.Enumeration


Question:
Which of these method can be used to increase the capacity of ArrayList object manually?

1.ensureCapacity()

2.increasecapacity()

3.increaseCapacity()

4.Capacity()


Question:
Which of these method can be used to make the main thread to be executed last among all the threads?

1.join()

2.stop()

3.sleep()

4.call()


Question:
Which of these method is used add an element and corresponding key to a map?

1.set()

2.put()

3.add()

4.redo()


Question:
Which of these method is used to add an element to the start of a LinkedList object?

1.addFirst()

2.AddFirst()

3.first()

4.add()


Question:
Which of these method is used to calculate number of bits required to hold the BitSet object?

1.numberofBits()

2.indexes()

3.length()

4.size()


Question:
Which of these method is used to change an element in a LinkedList Object?

1.add()

2.change()

3.redo()

4.set()


Question:
Which of these method is used to find out that a thread is still running or not?

1.Alive()

2.checkRun()

3.run()

4.isAlive()


Question:
Which of these method is used to insert value and its key?

1.set()

2.put()

3.addElement()

4.insertElement()


Question:
Which of these method is used to make a bit zero specified by the index?

1.clear()

2.put()

3.set()

4.remove()


Question:
Which of these method is used to make all elements of an equal to specified value?

1.fill()

2.add()

3.set()

4.all()


Question:
Which of these method is used to reduce the capacity of an ArrayList object?

1.trimTosize()

2.trimToSize()

3.trimSize()

4.trim()


Question:
Which of these method is used to remove all keys/values pair from the invoking map?

1.remove()

2.delete()

3.removeAll()

4.clear()


Question:
Which of these method Map class is used to obtain an element in the map having specified key ?

1.get()

2.search()

3.look()

4.set()


Question:
Which of these method of Array class is used sort an array or its subset?

1.bubblesort()

2.binarysort()

3.insert()

4.sort()


Question:
Which of these method of ArrayList class is used to obtain present size of an object?

1.index()

2.size()

3.capacity()

4.length()


Question:
Which of these method of HashSet class is used to add elements to its object?

1.Add()

2.add()

3.insert()

4.addFirst()


Question:
Which of these methods can be used to delete the last element in a LinkedList object?

1.delete()

2.remove()

3.deleteLast()

4.removeLast()


Question:
Which of these methods can be used to obtain a static array from an ArrayList object?

1.Array()

2.toArray()

3.covertArray()

4.covertoArray()


Question:
Which of these methods can be used to obtain set of all keys in a map?

1.keySet()

2.getAll()

3.getKeys()

4.keyall()


Question:
Which of these methods can be used to search an element in a list?

1.binaryserach()

2.find()

3.sort()

4.get()


Question:
Which of these methods is used to add elements in vector at specific location?

1.addElement()

2.AddElement()

3.set()

4.add()


Question:
Which of these methods is used to retrieve elements in BitSet object at specific location?

1.get()

2.Elementat()

3.getProperty()

4.ElementAt()


Question:
Which of these methods is used to retrieve the elements in properties object at specific location?

1.Elementat()

2.getProperty()

3.ElementAt()

4.get()


Question:
Which of these object stores association between keys and values?

1.Map

2.Array

3.String

4.Hash table


Question:
Which of these process occur automatically by java run time system?

1.Garbage collection

2.Serialization

3.File Filtering

4.All of the above


Question:
Which of these process occur automatically by java run time system?

1.Serialization

2.Deserialization

3.Memory allocation

4.All of the above


Question:
Which of these standard collection classes implements a linked list data structure?

1.LinkedList

2.HashSet

3.AbstractSet

4.AbstractList


Question:
Which of these standard collection classes implements all the standard functions on list data structure?

1.HashSet

2.AbstractSet

3.Array

4.LinkedList


Question:
Which of these standard collection classes implements all the standard functions on list data structure?

1.HashSet

2.AbstractSet

3.LinkedList

4.Array


More MCQS

  1. Java Mcq Question Set 1
  2. Java Mcq Question Set 2
  3. Java Mcq Question Set 3
  4. Java Mcq Question Set 4
  5. Java Mcq Question Set 5
  6. Java Mcq Question Set 6
  7. Java Mcq Question Set 7
  8. Java Mcq Question Set 8
  9. Java Mcq Question Set 9
  10. Java Multiple Choice Questions
  11. DATA TYPES IN JAVA
  12. Classes ,Constructor ,Methods,Inheritance
  13. Java Multiple Choice Questions.
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