Java Programming - Level 1
Questions and Answers
- 1.
What is the range of short data types in Java?
- A.
-128 to 127
- B.
-32768 to 32767
- C.
-2147483648 to 2147483647
- D.
None of the mentioned
Correct Answer
B. -32768 to 32767Explanation
Explanation: Short occupies 16 bits in memory. Its range is from -32768 to 32767.Rate this question:
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- 2.
What is the numerical range of a char data type in Java?
- A.
-128 to 127
- B.
0 to 256
- C.
0 to 32767
- D.
0 to 65535
Correct Answer
D. 0 to 65535Explanation
Explanation: Char occupies 16-bit in memory, so it supports 2^16 i:e from 0 to 65535.Rate this question:
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- 3.
Which of these is a long data type literal?
- A.
0x99fffL
- B.
ABCDEFG
- C.
0x99fffa
- D.
99671246
Correct Answer
A. 0x99fffLExplanation
Explanation: Data type long literals are appended by an upper or lowercase L. 0x99fffL is hexadecimal long literal.Rate this question:
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- 4.
Which of these operators is used to allocate memory to array variables in Java?
- A.
Malloc
- B.
Alloc
- C.
New
- D.
New malloc
Correct Answer
C. NewExplanation
Operator new allocates a block of memory specified by the size of array, and gives the reference of memory allocated to the array variable.Rate this question:
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- 5.
Which of these is not a bitwise operator?
- A.
&
- B.
&=
- C.
!=
- D.
Correct Answer
D.Explanation
Explanation:Rate this question:
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- 6.
What is the output of relational operators?
- A.
Integer
- B.
Boolean
- C.
Characters
- D.
Double
Correct Answer
B. BooleanExplanation
Explanation: NoneRate this question:
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- 7.
Which of these have highest precedence?
- A.
( )
- B.
++
- C.
*
- D.
>>
Correct Answer
A. ( )Explanation
Explanation: Order of precedence is (highest to lowest) a -> b -> c -> d.Rate this question:
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- 8.
Which of these selection statements test only for equality?
- A.
If
- B.
Switch
- C.
If & switch
- D.
None of the mentioned
Correct Answer
B. SwitchExplanation
Explanation: switch statements checks for equality between the controlling variable and its constant cases.Rate this question:
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- 9.
What is the stored in the object obj in following lines of code? box obj;
- A.
Memory address of allocated memory of object.
- B.
NULL
- C.
Any arbitrary pointer
- D.
Garbage
Correct Answer
B. NULLExplanation
Explanation: Memory is allocated to an object using new operator. box obj; just declares a reference to object, no memory is allocated to it hence it points to NULLRate this question:
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- 10.
What is the return type of a method that does not returns any value?
- A.
Int
- B.
Float
- C.
Void
- D.
Double
Correct Answer
C. VoidExplanation
Explanation: void method does not return any value.Rate this question:
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- 11.
What is the return type of Constructors?
- A.
Int
- B.
Float
- C.
Void
- D.
None of the mentioned
Correct Answer
A. IntExplanation
Explanation: Constructors does not have any return type, not even void.Rate this question:
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- 12.
What is a process of defining two or more methods within the same class that have the same name but different parameters declaration?
- A.
Method overloading
- B.
Method overriding
- C.
Method hiding
- D.
None of the mentioned
Correct Answer
A. Method overloadingExplanation
Explanation: Two or more methods can have the same name as long as their parameters declaration is different, the methods are said to be overloaded and the process is called method overloading. Method overloading is a way by which Java implements polymorphism.Rate this question:
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- 13.
Which of these access specifiers must be used for main() method?
- A.
Private
- B.
Public
- C.
Protected
- D.
None of the mentioned
Correct Answer
B. PublicExplanation
Explanation: main() method must be specified public as it called by Java run time system, outside of the program. If no access specifier is used then by default member is public within its own package & cannot be accessed by Java run time system.Rate this question:
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- 14.
Arrays in Java are implemented as?
- A.
Class
- B.
Object
- C.
Variable
- D.
None of the mentioned
Correct Answer
B. ObjectExplanation
Explanation: Array is object container which is used to hold a collection of fixed value having the same type.Rate this question:
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- 15.
String in Java is a?
- A.
Class
- B.
Object
- C.
Variable
- D.
Character array
Correct Answer
A. ClassExplanation
Explanation: NoneRate this question:
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- 16.
Which of ​this keyword must be used to inherit a class?
- A.
Super
- B.
This
- C.
Extents
- D.
Extends
Correct Answer
D. ExtendsExplanation
The keyword "extends" must be used to inherit a class. Inheritance is a mechanism in object-oriented programming that allows a class to inherit the properties and methods of another class. By using the "extends" keyword, a subclass can inherit the attributes and behaviors of a superclass, enabling code reuse and promoting a hierarchical structure in the program.Rate this question:
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- 17.
Which of these keywords can be used in subclass to call the constructor of superclass?
- A.
Super
- B.
This
- C.
Extent
- D.
Extends
Correct Answer
A. SuperExplanation
The keyword "super" can be used in a subclass to call the constructor of the superclass. It is used to invoke the superclass constructor and initialize the inherited members of the subclass. This allows the subclass to inherit and utilize the functionality of the superclass while also adding its own unique features.Rate this question:
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- 18.
Which of these class is superclass of every class in Java?
- A.
String class
- B.
Object class
- C.
Abstract class
- D.
ArrayList class
Correct Answer
B. Object classExplanation
Explanation: Object class is a superclass of every class in javaRate this question:
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- 19.
Which of these class is superclass of String and StringBuffer class?
- A.
Java.util
- B.
Java.lang
- C.
ArrayList
- D.
None of the mentioned
Correct Answer
B. Java.langExplanation
The correct answer is "java.lang" because the java.lang package contains fundamental classes and interfaces that are essential to the Java programming language. String and StringBuffer classes are both part of this package, making it the superclass of both.Rate this question:
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- 20.
Which of these method of class String is used to extract more than one character at a time a String object?
- A.
Getchars()
- B.
GetChars()
- C.
Getchars()
- D.
GetChars()
Correct Answer
D. GetChars()Explanation
The method getChars() is used to extract more than one character at a time from a String object.Rate this question:
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- 21.
Which of these method of class String is used to compare two String objects for their equality?
- A.
Equals()
- B.
Equals()
- C.
Isequal()
- D.
Isequal()
Correct Answer
A. Equals()Explanation
The method "equals()" is used to compare two String objects for their equality. This method checks if the content of the two strings is the same, regardless of their memory location. It returns a boolean value, true if the strings are equal, and false if they are not.Rate this question:
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- 22.
Which of these method of class String is used to extract a substring from a String object?
- A.
Substring()
- B.
Substring()
- C.
SubString()
- D.
None of the mentioned
Correct Answer
A. Substring()Explanation
The correct answer is substring(). This method is used to extract a substring from a String object. It takes two parameters, the starting index and the ending index, and returns a new string that is a subset of the original string. The substring() method is case-sensitive and the ending index is exclusive, meaning it does not include the character at that index in the substring.Rate this question:
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- 23.
Which of these class is used to create an object whose character sequence is mutable?
- A.
String()
- B.
StringBuffer()
- C.
Both of the metioned
- D.
None of the mentioned
Correct Answer
B. StringBuffer()Explanation
Explanation: StringBuffer represents growable and writeable character sequence.Rate this question:
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- 24.
Which of these keywords is used to define packages in Java?
- A.
Pkg
- B.
Pkg
- C.
Package
- D.
Package
Correct Answer
C. PackageExplanation
The keyword "package" is used to define packages in Java. Packages are used to organize classes and interfaces into groups, making it easier to manage and maintain large codebases. By using the "package" keyword followed by the package name, developers can create a hierarchical structure for their code. This allows for better organization, reusability, and encapsulation of code.Rate this question:
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- 25.
Which of these keywords is used to define interfaces in Java?
- A.
Interface
- B.
Interface
- C.
Intf
- D.
Intf
Correct Answer
A. InterfaceExplanation
The keyword "interface" is used to define interfaces in Java. In Java, an interface is a collection of abstract methods that can be implemented by a class. It defines a contract that a class must adhere to if it wants to implement that interface. The other options "Interface", "intf", and "Intf" are not valid keywords in Java for defining interfaces.Rate this question:
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- 26.
Which of these classes is not included in java.lang?
- A.
Byte
- B.
Integer
- C.
Array
- D.
Class
Correct Answer
C. ArrayExplanation
Explanation: Array class is a member of a java.utilRate this question:
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- 27.
Which of these class have only one field ‘TYPE’?
- A.
Void
- B.
Process
- C.
System
- D.
Runtime
Correct Answer
A. VoidExplanation
Explanation: The Void class has one field, TYPE, which holds a reference to the Class object for the type void.Rate this question:
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- 28.
Which of these class is superclass of all other classes?
- A.
Math
- B.
Process
- C.
System
- D.
Object
Correct Answer
D. ObjectExplanation
The correct answer is "Object" because in Java, the Object class is the root class for all other classes. It is at the top of the class hierarchy and serves as the superclass for all other classes. Every class in Java directly or indirectly extends the Object class, which provides basic functionalities and methods that are inherited by all other classes.Rate this question:
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- 29.
Which of these class is used for input and output operation when working with bytes?
- A.
InputStream
- B.
Reader
- C.
Writer
- D.
All of the mentioned
Correct Answer
A. InputStreamExplanation
Explanation: InputStream & OutputStream are designed for byte stream. Reader and writer are designed for character stream.Rate this question:
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- 30.
Which of these is a process of writing the state of an object to a byte stream?
- A.
Serialization
- B.
Externalization
- C.
File Filterning
- D.
All of the mentioned
Correct Answer
A. SerializationExplanation
Serialization is the process of writing the state of an object to a byte stream. This is used when you want to save the state of your program to the persistent storage area.Rate this question:
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Mar 21, 2023Quiz Edited by
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Sep 17, 2017Quiz Created by
Rushikesh
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