Introduction to Java MCQs
Introduction to Java MCQs
Answer these 90+ Introduction to Java MCQs and assess your grip on the subject of Introduction to Java. Scroll below and get started!
1: A block is enclosed inside ________.
A. Parentheses
B. Braces
C. Brackets
D. Quotes
2: A class specifies the ________ and ________ that a particular type of object has.
A. Fields; object names
B. Fields; methods
C. Relationships; methods
3: A java character is stored in ________.
A. One byte
B. Two bytes
C. Three bytes
D. Four bytes
4: A java program is stored in an executable file called a(n) ____ file.
A. Exe
B. Class
C. Java
D. Js
5: A javafx action event handler contains a method ________.
A. Public void actionPerformed(ActionEvent e)
B. Public void actionPerformed(Event e)
C. Public void handle(ActionEvent e)
D. Public void handle(Event e
6: A javafx action event handler is an instance of ________.
A. ActionEvent
B. Action
C. EventHandler
D. EventHandler
7: A literal string is a(n) ____ object.
A. Anonymous
B. Inherits
C. Length()
D. Reference
8: A loop controlled by the user is a type of ____ loop.
A. Indefinite
B. Definite
C. Counter-controlled
D. Incrementing
9: A method header is also called a(n) _____.
A. Parentheses
B. Declaration
C. Abstraction
D. Accessor
10: A method that has no implementation is called a/an ____ method.
A. Abstract
B. Overloaded
C. Interface
D. Implementation
11: A method must declare to throw ________.
A. RuntimeException
B. Error
C. Checked exceptions
D. Unchecked exceptions
12: A static method can ________.
A. A static method can _______.call only other static methods of the same class directly
B. Manipulate only static fields in the same class directly
C. Be called using the class name and a dot (.)
D. All of the above
13: Another name for a nonstatic member class is a(n) ____.
A. Comes into scope
B. Integer
C. Inner class
D. Reference
14: Any field declared with keyword ________ is constant.
A. Static
B. Const
C. Constant
D. Final
15: Arguments to methods always appear within ________.
A. Brackets
B. Parentheses
C. Curly braces
D. Quotation marks
16: Before entering a loop, the first input statement, or ____, is retrieved.
A. Prefix increment
B. Accumulating
C. Incrementing
D. Priming read
17: Boolean values can be displayed as the words true and false with the ________ format specifier.
A. %b
B. %d
C. %f
18: By convention, a class diagram contains the ____ following each attribute or method.
A. Class
B. Data type
C. Argument
D. Data field
19: Character literals are enclosed in ________; string literals are enclosed in ________.
A. Single quotes; double quotes
B. Standard output device
C. Identifiers can contain spaces
D. String concatenation operator
20: Data items you use in a call to a method are called ____.
A. Data fields
B. Modifiers
C. Accessors
D. Arguments
21: Declaring instance variables ________ is known as data hiding or information hiding.
A. Secure
B. Private
C. Static
D. Masked
22: Every class in java, except ________, extends an existing class.
A. ImageIcon
B. Object
C. SetText
D. Private
23: Every object is a _____ of a more general class.
A. Member
B. Accessor
C. Mutator
D. Method
24: Exception handling helps you create ________ programs.
A. High-performance
B. Logic-error-free
C. Fault-tolerant
D. Compilation-error-free
25: For input we will use the ______ class.
A. Scanner
B. Printer
C. None of these
26: If a key is not in the list, the binarysearch method returns ________.
A. Low is 4 and high is 6
B. List1 is 2.5 3.1, 3.1, 6.4
C. Java.util.Arrays.sort(scores)
D. -(insertion point + 1
27: If a programming language does not support ____, the language is not considered object-oriented.
A. Polymorphism
B. Syntax
C. Applets
D. Loops
28: If an exception occurs in a try-catch block, the code in the finally clause ________.
A. ClassCastException
B. Is executed
C. Throwable
D. Print
29: If you attempt to add an int, a byte, a long, and a float, the result will be a ________ value.
A. Float
B. Int
C. Char
30: In a do…while loop, the loop will continue to execute until ____.
A. The loop control variable is false
B. ++score = score + 1
C. Event-controlled
D. Prefix increment operator
31: In java all output uses the ______ data type.
A. Int
B. Scan
C. String
D. Double
E. Char
32: In java graphics, coordinate units are measured in ________.
A. Dots.
B. Pixels.
C. Points.
D. Inches
33: In java, the word true is ________.
A. A Java keyword
B. A Boolean literal
C. Same as value 1
D. Same as value 0
34: In java, ________ must be declared before they can be used.
A. Variables
B. Literals
C. Key words
D. Comments
35: In java, you use variables of type ____ to store integers, or whole numbers.
A. Constant
B. \n
C. Input
D. Int
36: In order to allocate the needed memory for an object, you must use the ____ operator.
A. . nested
B. Loop
C. Get
D. New
37: In pcdata, the ____ symbol is used to indicate a special character.
A. *
B. #
C. $
38: Information is passed to a method in ________.
A. The method name
B. That method's return
C. The method body
D. The arguments to the method
39: Invoking ________ returns the number of the elements in an arraylist x.
A. 0.0, 0.5
B. X.get(0)
C. X.clear()
D. X.size
40: It is important that the loop control ____ be altered within the body of the loop.
A. Infinite
B. Variable
C. Negative
D. Validating data
41: Java ________ can run from a web browser.
A. Applications
B. Applets
C. Servlets
D. Micro Edition programs
42: Java contains a class named ____ that allows you to produce dialog boxes.
A. JOptionPane
B. Vehicle.class
C. Semicolon
D. Encapsulation
43: Java uses class ________ to represent colors using their rgb values.
A. Class, block
B. Color
C. Math.sqrt(900);
D. Classes
44: Java, c#, and vb.net are examples of ________.
A. Client operating systems
B. Object-oriented languages
C. Thin-client applications
D. Structured queries
45: Java.util.vector is a subtype of ________.
A. Java.util.ArrayList
B. Java.util.LinkedList, java.util.List
C. Java.util.AbstractList
D. Java.util.Vector
E. Java.util.List
46: Javascript requires _____ programming knowledge and experience as java.
A. Backslash
B. Case sensitive
C. The same
D. Slashes
47: Local variables must be ________.
A. Initialized when they're declared
B. Initialized before their values are used in expression
C. Declared and initialized in two steps
D. Declared at the top of the main method's body
48: Method calls cannot be distinguished by ________.
A. Return type
B. Class, block
C. Method name
D. The return type
49: Methods that set values are called ____ methods.
A. Mutator
B. Modifier
C. Access
D. Creator
50: On many keyboards, the break key is also the ____ key.
A. False
B. Variable
C. True
D. Pause
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