R4RIN – MCQs, Mock Tests | Java Java Mcq Question Set 5

Which of these classes is not part of Java's collection framework?

1. Stack
2. Queue
3. Array
4. Maps

✅ Correct Answer: 2

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

1. Set
2. List
3. SortedList
4. SortedMap

✅ Correct Answer: 3

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

1. delete()
2. refresh()
3. reset()
4. clear()

✅ Correct Answer: 4

What is Collection in Java?

1. A group of classes
2. A group of objects
3. A group of interfaces
4. None

✅ Correct Answer: 2

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

1. Comparator
2. Collection
3. EventListner
4. set

✅ Correct Answer: 2

Which of these interface handle sequences?

1. List
2. Set
3. Collection
4. Comparator

✅ Correct Answer: 1

Which of these interface must contain a unique element?

1. Set
2. List
3. Collection
4. Array

✅ Correct Answer: 1

Which of these is Basic interface that all other interface inherits?

1. Array
2. Set
3. Collection
4. List

✅ Correct Answer: 3

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

1. max(Collection c)
2. max(Comparator comp)
3. max(List c)
4. max(Collection c, Comparator comp)

✅ Correct Answer: 2

Which of these methods sets every element of a List to a specified object?

1. fill()
2. set()
3. add()
4. Complete()

✅ Correct Answer: 1

Which of these methods can randomize all elements in a list?

1. randomize()
2. ambigous()
3. rand()
4. shuffle()

✅ Correct Answer: 4

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

1. ConvertList()
2. singletonList()
3. CopyList()
4. SetList()

✅ Correct Answer: 2

Which of these is true about unmodifiableCollection() method?

1. unmodifiableCollection() method is available only for List and Set.
2. unmodifiableCollection() returns a collection that cannot be modified.
3. unmodifiableCollection() is defined in Collection class.
4. None

✅ Correct Answer: 1

Which of these is static variable defined in Collections?

1. EMPTY_SET
2. EMPTY_LIST
3. EMPTY_MAP
4. All of the above

✅ Correct Answer: 4

Which of these is used to perform all input & output operations in Java?

1. classes
2. Variables
3. streams
4. Methods

✅ Correct Answer: 3

Which of these is a type of stream in Java?

1. Short stream
2. Integer stream
3. Long stream
4. Byte stream

✅ Correct Answer: 4

Which of these classes are used by Byte streams for input and output operation?

1. InputOutputStream
2. InputStream
3. Reader
4. All of the above

✅ Correct Answer: 2

Which of these classes are used by character streams for input and output operations?

1. Writer
2. InputStream
3. InputOutputStream
4. ReadStream

✅ Correct Answer: 1

Which of these class is used to read from byte array?

1. BufferedInputStream
2. ArrayInputStream
3. ByteArrayInputStream
4. InputStream

✅ Correct Answer: 3

Which exception is thrown by read() method?

1. SystemInputException
2. SystemException
3. InterruptedException
4. IOException

✅ Correct Answer: 4

Which of these is used to read a string from the input stream?

1. readLine()
2. get()
3. getLine()
4. read()

✅ Correct Answer: 1

Which of these class is used to read characters and strings in Java from console?

1. StringReader
2. BufferedReader
3. InputStreamReader
4. BufferedStreamReader

✅ Correct Answer: 2

Which of these classes are used by Byte streams for input and output operation?

1. InputStream
2. InputOutputStream
3. Reader
4. All of the above

✅ Correct Answer: 1

Which of these class is implemented by FilterInputStream class?

1. BufferedInputStream
2. FileInputStream
3. BufferedFileInputStream
4. InputStream

✅ Correct Answer: 2

Which of these class contains the methods print() & println()?

1. System.out
2. System
3. PrintStream
4. BUfferedOutputStream

✅ Correct Answer: 3

Which of these methods can be used to writing console output?

1. print()
2. println()
3. write()
4. All of the above

✅ Correct Answer: 4

Which of these class is used to create an object whose character sequence is mutable?

1. StringBuffer()
2. String()
3. Both of the mentioned
4. None

✅ Correct Answer: 1

Which of these method of class StringBuffer is used to reverse sequence of characters?

1. reverseall()
2. Reverse()
3. reverse()
4. reverseAll()

✅ Correct Answer: 3

Which of these classes are used by character streams output operations?

1. Writer
2. InputStream
3. ReadStream
4. InputOutputStream

✅ Correct Answer: 1

Which of the following statement is correct?

1. replace() method replaces last occurrence of a character in invoking string with another character.
2. replace() method replaces first occurrence of a character in invoking string with another character.
3. reverseall() method reverses all characters.
4. reverse() method reverses all characters.

✅ Correct Answer: 4

Which of these packages contain classes and interfaces used for input & output operations of a program

1. java.io
2. java.util
3. java.lang
4. All of the above

✅ Correct Answer: 1

Which of these class is not a member class of java.io package?

1. Writer
2. String
3. File
4. StringReader

✅ Correct Answer: 2

Which of these interface is not a member of java.io package?

1. ObjectFilter
2. DataInput
3. FileFilter
4. ObjectInput

✅ Correct Answer: 1

Which of these class is not related to input and output stream in terms of functioning?

1. File
2. Writer
3. Reader
4. InputStream

✅ Correct Answer: 1

Which of these is specified by a File object?

1. directory path
2. directory in disk
3. a file in disk
4. None

✅ Correct Answer: 2

Which of these is method for testing whether the specified element is a file or a directory?

1. Isfile()
2. isfile()
3. IsFile()
4. isFile()

✅ Correct Answer: 4

Which of these classes is used for input and output operation when working with bytes?

1. Reader
2. InputStream
3. Writer
4. All of the above

✅ Correct Answer: 2

Which of these class is used to read and write bytes in a file?

1. InputStreamReader
2. FileInputStream
3. FileWriter
4. FileReader

✅ Correct Answer: 2

Which of these method of InputStream is used to read integer representation of next available byte input?

1. scanf()
2. read()
3. get()
4. getInteger()

✅ Correct Answer: 2

Which of these data type is returned by every method of OutputStream?

1. float
2. int
3. byte
4. None of these

✅ Correct Answer: 4

Which of these is a method to clear all the data present in output buffers?

1. flush()
2. clear()
3. close()
4. fflush()

✅ Correct Answer: 1

Which of these is method is used for writing bytes to an outputstream?

1. print()
2. put()
3. printf()
4. write()

✅ Correct Answer: 1

Which of these stream contains the classes which can work on character stream?

1. Character Stream
2. InputStream
3. OutputStream
4. All of the above

✅ Correct Answer: 1

Which of these class is used to read characters in a file?

1. FileWriter
2. FileReader
3. FileInputStream
4. InputStreamReader

✅ Correct Answer: 2

Which of these method of FileReader class is used to read characters from a file?

1. get()
2. scanf()
3. read()
4. getInteger()

✅ Correct Answer: 3

Which of these class can be used to implement input stream that uses a character array as the source?

1. FileReader
2. CharArrayReader
3. BufferedReader
4. FileArrayReader

✅ Correct Answer: 2

Which of these is a method to clear all the data present in output buffers?

1. close()
2. clear()
3. fflush()
4. flush()

✅ Correct Answer: 4

Which of these classes can return more than one character to be returned to input stream?

1. PushbachReader
2. BufferedReader
3. CharArrayReader
4. Bufferedwriter

✅ Correct Answer: 1

Which of these standard collection classes implements a dynamic array?

1. ArrayList
2. LinkedList
3. AbstractSet
4. AbstractList

✅ Correct Answer: 1