Deck 14: Java Programming:methods, Data Types, Operators, and Classes

Question 1

What is the string contained in s after following lines of code?
StringBuffersnewStringBuffer("Hello");S)deleteCharAt(0);

A)Hell
B)ello
C)Hel.
D)llo.

Answer 1

ello

Question 2

Which of these method(s) is/are used for writing bytes to an outputstream?

A)put()
B)print() and write()
C)printf()
D)write() and read()

Answer 2

print() and write()

Question 3

Which keyword is used by the method to refer to the object that invoked it?

A)import
B)catch
C)abstract
D)this

Answer 3

this

Question 4

What is the return type of a method that does not return any value?

A)int
B)float
C)void
D)double

Question 5

Which of these selection statements test only for equality?

A)if
B)switch
C)if & switch
D)none of the mentioned

Question 6

Which of these jump statements can skip processing the remainder of the code in its body for a particular iteration?

A)break
B)return
C)exit
D)continue

Question 7

Which of these is the method which is executed first before execution of any other thing takes place in a program?

A)main method
B)finalize method
C)static method
D)private method

Question 8

Which of these data type can be used for a method having a return statement in it?

A)void
B)int
C)float
D)both int and float

Question 9

If an expression contains double, int, float, long, then the whole expression will be promoted into which of these data types?

A)long
B)int
C)double
D)float

Question 10

Which of the below is invalid identifier with the main method?

A)public
B)static
C)private
D)final

Question 11

Which of these can not be used for a variable name in Java?

A)identifier
B)keyword
C)identifier & keyword
D)none of the mentioned

Question 12

which of the following can be operands of arithmetic operators?

A)Numeric
B)Boolean
C)Characters
D)Both Numeric & Characters

Question 13

How to copy contents of array?

A)System.arrayCopy()
B)Array.copy()
C)Arrays.copy()
D)Collection.copy()

Question 14

Which of these are selection statements in Java?

A)if()
B)for()
C)continue
D)break

Question 15

Which of these operators is used to allocate memory for an object?

A)malloc
B)alloc
C)new
D)give

Question 16

Which of these packages contains the exception Stack Overflow in Java?

A)java.lang
B)java.util
C)java.io
D)java.system

Question 17

Which of this method of class String is used to obtain a length of String object?

A)get()
B)Sizeof()
C)lengthof()
D)length()

Question 18

Which of these methods of a Thread class is used to suspend a thread for a period of time?

A)sleep()
B)terminate()
C)suspend()
D)stop()

Question 19

Which of these exceptions will be thrown if we use null reference for an arithmetic operation?

A)ArithmeticException
B)NullPointerException
C)IllegalAccessException
D)IllegalOperationException

Question 20

Which of the interface contains all the methods used for handling thread related operations in Java?

A)Runnable interface
B)Math interface
C)System interface
D)ThreadHandling interface

Question 21

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

A)FileReader
B)FileWriter
C)FileInputStream
D)InputStreamReader

Question 22

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

A)InputStream
B)Reader
C)Writer
D)All of the mentioned

Question 23

Which of these class is a superclass of all other classes?

A)Math
B)Process
C)System
D)Object

Question 24

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

A)String
B)StringReader
C)Writer
D)File

Question 25

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

A)File
B)Writer
C)InputStream
D)Reader