Java Programming: Ultimate Quiz! MCQ

2.

Which of these values can a boolean variable contain?

True and False
0 and 1
Any Integer value
True

Correct Answer

A. True and False

Explanation

Explanation: Boolean variable can contain only one of two possible values, true and false.

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3.

Which of these can be returned by the operator & ?

Integer
Boolean
Character
Integer or Boolean

Correct Answer

A. Integer or Boolean

Explanation

Explanation: We can use binary ampersand operator on integers/chars (and it returns an integer) or on booleans (and it returns a boolean).

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4.

What is the value stored in x in following lines of code?int x, y, z;x = 0;y = 1;x = y = z = 8;

0
1
9
8

Correct Answer

A. 8

Explanation

Explanation: none

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5.

Which of these are selection statements in Java?

If()
For()
Continue
Break

Correct Answer

A. If()

Explanation

Explanation: continue and break are jump statements, and for is an looping statement.

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6.

Which of the following is a method having same name as that of its class?

Finalize
Constructor
Class
Delete

Correct Answer

A. Constructor

Explanation

A constructor is a method that initializes an object immediately upon creation. It has the same name as that of class in which it resides

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7.

On applying Left shift operator, <<, on an integer bits are lost one they are shifted past which position bit?

1
31
32
33

Correct Answer

A. 31

Explanation

Explanation: The left shift operator shifts all of the bits in a value to the left specified number of times. For each shift left, the high order bit is shifted out and lost, zero is brought in from the right. When a left shift is applied to an integer operand, bits are lost once they are shifted past the bit position 31.

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8.

Which of these cannot be declared static?

Class
Object
Variable
Method

Correct Answer

A. Object

Explanation

Explanation: static statements are run as soon as class containing then is loaded, prior to any object declaration.

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9.

A class member declared protected becomes member of subclass of which type?

Public member
Private member
Protected member
Static member

Correct Answer

A. Private member

Explanation

Explanation: A class member declared protected becomes private member of subclass.

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10.

Which of this method of an Object class can clone an object?

Objectcopy()
Copy()
Object clone()
Clone()

Correct Answer

A. Object clone()

Explanation

The correct answer is "Object clone()". This method is a part of the Object class in Java and is used to create a copy or clone of an object. It returns a new object that is a copy of the original object.

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11.

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

Get()
Sizeof()
Lengthof()
Length()

Correct Answer

A. Length()

Explanation

Explanation: Method length() of string class is used to get the length of the object which invoked method length().

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12.

Which of these method of class StringBuffer is used to concatenate the string representation to the end of invoking string?

Concat()
Append()
Join()
Concatenate()

Correct Answer

A. Append()

Explanation

The method append() of class StringBuffer is used to concatenate the string representation to the end of the invoking string. This method appends the specified string to the existing string and returns a reference to the modified StringBuffer object. It is commonly used to build longer strings by appending smaller strings together.

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13.

Which of these keywords can be used to prevent Method overriding?

Static
Constant
Protected
Final

Correct Answer

A. Final

Explanation

Explanation: To disallow a method from being overridden, specify final as a modifier at the start of its declaration. Methods declared as final cannot be overridden.

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14.

Which of these methods is an alternative to getChars() that stores the characters in an array of bytes?

GetBytes()
GetByte()
GiveByte()
Give Bytes()

Correct Answer

A. GetBytes()

Explanation

Explanation: getBytes() stores the character in an array of bytes. It uses default character to byte conversions provided by the platform.

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15.

Which of these is a mechanism for naming and visibility control of a class and its content?

Object
Packages
Interfaces
None of the Mentioned.

Correct Answer

A. Packages

Explanation

Explanation: Packages are both naming and visibility control mechanism. We can define a class inside a package which is not accessible by code outside the package.

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16.

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

Serializable
Externalization
FileFilter
ObjectInput

Correct Answer

A. Externalization

Explanation

Externalization is an interface for control over serialization and deserialization. It allows developers to have more control over the serialization process by implementing the Externalizable interface and providing their own custom serialization logic. This interface provides two methods, writeExternal() and readExternal(), which allow objects to write and read their own state in a customized manner. This is different from the Serializable interface, which provides a default serialization mechanism. FileFilter and ObjectInput are not interfaces for control over serialization and deserialization.

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17.

Which of these methods is used to compare a specific region inside a string with another the specific region in another string?

RegionMatch()
Match()
RegionMatches()
RegionMatches()

Correct Answer

A. RegionMatches()

Explanation

The method regionMatches() is used to compare a specific region inside a string with another specific region in another string.

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18.

Which of these keywords is not a part of exception handling?

Try
Finally
Thrown
Catch

Correct Answer

A. Thrown

Explanation

Explanation: Exceptional handling is managed via 5 keywords – try, catch, throws, throw and finally.

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19.

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

Serialization
Externalization
File Filtering
Deserialization

Correct Answer

A. Deserialization

Explanation

Explanation: Deserialization is a process by which the data written in the stream can be extracted out from the stream.

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20.

Which of these is a super class of wrappers Double and Float?

Long
Digits
Float
Number

Correct Answer

A. Number

Explanation

Explanation: Number is an abstract/super class containing subclasses Double, Float, Byte, Short, Integer and Long.

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Java Programming: Ultimate Quiz! MCQ

Which of the following are legal lines of Java code? 1. int w = (int)888.8; 2. byte x = (byte)100L; 3. long y = (byte)100; 4. byte z = (byte)100L;

Quiz Preview

Which of these values can a boolean variable contain?

Which of these can be returned by the operator & ?

What is the value stored in x in following lines of code?int x, y, z;x = 0;y = 1;x = y = z = 8;

Which of these are selection statements in Java?

Which of the following is a method having same name as that of its class?

On applying Left shift operator, <<, on an integer bits are lost one they are shifted past which position bit?

Which of these cannot be declared static?

A class member declared protected becomes member of subclass of which type?

Which of this method of an Object class can clone an object?

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

Which of these method of class StringBuffer is used to concatenate the string representation to the end of invoking string?

Which of these keywords can be used to prevent Method overriding?

Which of these methods is an alternative to getChars() that stores the characters in an array of bytes?

Which of these is a mechanism for naming and visibility control of a class and its content?

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

Which of these methods is used to compare a specific region inside a string with another the specific region in another string?

Which of these keywords is not a part of exception handling?

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

Which of these is a super class of wrappers Double and Float?