What will be the output if the number is 155?

The number is also greater than 120., The number is less than 300.

How do you declare and initialize a one-dimensional array of strings?

string[ ] names = {"Alice", "Bob", "Charlie"};

What is the right syntax to assign the color RED to a variable?

Signal currentSignal = Signal.RED;

In Java, what happens if you declare a variable with the same name in both the instance and local scopes?

The local variable takes precedence over the instance variable.

If you declare an array of objects in Java without initializing it, what will be the initial value of its elements?

The elements will be initialized to null.

What is the primary purpose of instance variables in Java?

To provide data that is unique to each instance of a class.

What is the primary purpose of the stack memory?

Executing a thread and managing local variables.

Which is true about the finally block in a try-catch-finally structure?

The finally block is executed regardless an exception occurs or not

What is the right syntax to define an enum?

enum Colors { RED, GREEN, BLUE; }

What is the correct signature of the main method in Java?

public static void main(String [] args)

How is an object created?

By using the new keyword followed by the class name and constructor.

What is the purpose of a constructor in a class?

To perform object initialization.

Which is the correct syntax to check multiple conditions in a sequence.

if (condition) { } else if (anotherCondition) { } else { }

In Java, what is the key characteristic of the do-while loop?

It always executes the code block at least once.

What is the key characteristic of a static variable in Java?

It is shared among all instances of a class.

How is memory allocated for static variables compared to instance variables?

Static variables share the same memory space among all instances.

studbud

W24-Trafalgar-Java Midterm Exam Review

71 termsStudBud Administration264 plays

Java Midterm Review (Week 1 to 6)

Flashcards71 cardsFPractice quizPHost liveL

Questions 71

Answers

1
What will be the output if the number is 155?
The number is also greater than 120.
The number is greater than or equal to 300.
The number is not greater than 120.
The number is less than 300.
2
What is the output of this code?
27
12
15
c
3
What does the Java Virtual Machine (JVM) use to execute Java programs?
Source code.
Assembly code.
Bytecode.
Machine code.
4
How do you declare and initialize a one-dimensional array of strings?
int[ ] names = {"Alice", "Bob", "Charlie"};
array names = {"Alice", "Bob", "Charlie"};
names[ ] = {"Alice", "Bob", "Charlie"};
string[ ] names = {"Alice", "Bob", "Charlie"};
5
JRE (Java Runtime Environment) contains the JVM and Java API
False
True
6
What is the value of balance after the following code is executed?
0
-1
1
2
7
String variables are store a value, not a reference
True
False
8
What is the right syntax to assign the color RED to a variable?
String currentSignal = Signal.RED;
Signal currentSignal = Signal.RED;
Signal currentSignal = RED;
String currentSignal = RED;
9
In Java, what happens if you declare a variable with the same name in both the instance and local scopes?
The instance variable takes precedence over the local variable.
It results in a compilation error.
The local variable takes precedence over the instance variable.
Both variables can be used interchangeably.
10
Suppose income is 4001, what is the output of the following code?
Income is greater than 3000
Income is greater than 4000
Income is greater than 3000 followed by Income is greater than 4000
Income is greater than 4000 followed by Income is greater than 3000
11
If you declare an array of objects in Java without initializing it, what will be the initial value of its elements?
The elements will be initialized to 0.
The elements will be initialized to null.
The elements will be initialized to an empty string.
The elements will be initialized to 1.
12
What is the primary purpose of instance variables in Java?
To provide data that is unique to each instance of a class.
To store temporary data within a method.
To store constant values.
To store data that is accessible only within the main method.
13
A(n) ____ variable stores the memory address of an object.
Primitive variable
Static variable
Instance variable
Reference variable
14
2 methods can have the same name as long as the signature is different
True
False
15
Which is the right way to access the static variable a?
Test.a
t2.a
a
t1.a
16
Do the following two loops result in the same value in sum?
False
True
17
What is the first 5 numbers that will be printed?
1 2 3 4 5
5 10 15 20 25
2 4 6 8 10
3 6 9 12 15
18
What is the primary purpose of the stack memory?
Storing class structures and static variables.
Storing objects and arrays.
Executing a thread and managing local variables.
Dynamic memory allocation.
19
Which is true about the finally block in a try-catch-finally structure?
The finally block is executed only if no exception occurs
The finally block is executed regardless an exception occurs or not
The finally block is mandatory
The finally block is used to catch exceptions
20
What is the right syntax to define an enum?
enum Colors => [RED, GREEN, BLUE];
enum Colors = {RED, GREEN, BLUE};
enum Colors: RED, GREEN, BLUE;
enum Colors { RED, GREEN, BLUE; }
21
What is the correct signature of the main method in Java?
public void main(String[] args)
public static void main()
public static void main(String[] arguments)
public static void main(String [] args)
22
Suppose x = 1, y = -1, and z = 1. What is the output of the following statement?
x < 0 and z > 0
x < 0 and z < 0
no output
x > 0 and y > 0
23
What does garbage collection in Java primarily address?
Runtime exceptions.
Syntax errors.
Compilation errors.
Memory leaks.
24
Which memory area is responsible for storing objects, arrays, and dynamic memory allocations ?
Stack Memory.
Native Method Stack.
Heap Memory.
Method Area.
25
How is an object created?
By using the new keyword followed by the class name and constructor.
By defining a variable.
By declaring a method.
By importing a package.
26
What is the purpose of a constructor in a class?
To create objects.
To perform object initialization.
To define methods.
To organize code.
27
Which one is the correct class header
public myClass { }
public class MyClass { }
private class myClass { }
MyClass class { }
28
What will be returned from this method header?
a
a String
a char
printMessage
29
Which of the following is NOT a key aspect of encapsulation?
Private fields.
Public methods (getters and setters).
Use of access modifiers.
Public fields.
30
Which area of the JVM is responsible for storing class structures, method information, and static variables?
Method Area.
Heap Memory.
Program Counter (PC) Register.
Stack Memory.
31
What is the output of the following code?
x is 1
x is 0
x is 2
x is 3
32
Which is the correct syntax to check multiple conditions in a sequence.
if (condition) { } else if (anotherCondition) { } else { }
if (condition) { } else if { }
if (condition) { } elif (anotherCondition) { }
if (condition) { } else { }
33
When an object is instantiated, what will run automatically?
The constructor
All methods
The instance variable
The Class
34
What is the shape used for decisions in a flowchart
Rectangle
Diamond
Parallelogram
Circle
35
In Java, what is the key characteristic of the do-while loop?
It always executes the code block at least once.
It only executes the code block if the condition is true.
It is primarily used for mathematical calculations.
It is an alternative syntax for the for loop
36
How many times will the following code print "Welcome to Java"?
10
9
8
11
37
What will be the output of str2
Hello World
null
Hello
World
38
Which is the correct way of calling a method named displayMessage with the parameter aString?
displayMessage();
displayMessage(aString);
displayMessage;
displayMessage(aString());
39
What is the key characteristic of a static variable in Java?
It is specific to each instance of a class.
It is shared among all instances of a class.
It is declared within a method.
It can only be accessed from within the class constructor.
40
What does the term "instance" refer to in the context of object-oriented programming?
A loop construct
An object of a class
A method in a class
A variable in a class
41
Which of the following creates an int array with the name arr that can hold 5 elements
int[] arr = new int[4];
int[][] arr = new int[5];
int[] arr = new int[6];
int[] arr = new int[5];
42
What should be the return type of a setter method?
String
void
the data type for that instance variable
int
43
What will be displayed when the following code is executed?
0 -3
3 0
6 3 0
3 0 -3
44
How is memory allocated for static variables compared to instance variables?
Each instance has its own copy of static variables.
Static variables share the same memory space among all instances.
Static variables use less memory than instance variables.
Instance variables are stored in a separate memory pool.
45
What is the output of this code?
27
14
10
15
46
Which is the correct syntax for do-while loop?
while (condition) { } do;
do { } while (condition);
for (int i = 0; i < 5; i++) { }
while (condition) do { };
47
The following loop displays _______________.
1 3 5 7 9
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5
2 4 6 8 10
48
Interpreter translates java source code into bytecode
False
True
49
What is the default value of a class variable String?
undefined
""
NULL
" "
50
What type of variable is age?
Local variable
Reference variable
Primitive variable
Instance variable
51
What happens if an exception occurs inside the try block and there is no matching catch block?
The program continues executing the code after the try-catch block.
The program terminates.
An error message is displayed.
The code inside the try block is skipped.
52
What is NOT true about the stack?
Local variables are stored in the current stack frame
Current stack frame is destroyed when a method is exited
Current stack frame is created when a method is exited
it's an organized area in memory
53
What happens if the condition in an if statement is false and there is no else block?
The code inside the else block is executed.
the code inside the if block is skipped.
The program terminates.
An exception is thrown.
54
What is the length of a one-dimensional array?
The number of elements in the array.
The average value of the elements in the array.
The index of the last element in the array.
The sum of all elements in the array.
55
What is the scope of a local variable in Java?
Global scope, accessible across all classes in the program.
Accessible throughout the entire class.
Limited to the method or block where it is declared.
Available to other classes in the same package.
56
What is the purpose of private fields in encapsulation?
To control access and modification of the fields
To hide the fields from all classes.
To enforce immutability of the fields.
To make the fields accessible from any class.
57
How does Java differentiate between overloaded methods?
By the order of the methods in the class.
By the return type of the methods.
By the number and types of parameters.
By the visibility modifiers of the methods.
58
What type of variable is newStudent?
Primitve variable
Reference variable
Instance variable
Local variable
59
What should be the return type of getter method?
int
String
void
the data type of that instance variable
60
How is a method called in Java?
By invoking its name and passing arguments.
By using the call keyword.
By using the execute keyword.
By providing its method signature.
61
What is method overloading ?
Defining multiple classes with the same method names.
Defining multiple methods with different names in a class.
Defining multiple methods with different return types in a class.
Defining multiple methods with the same name in a class.
62
What is an object in Java?
An instance of a class with its own set of attributes and behaviors.
A method used for object initialization.
A loop construct in Java.
A variable that holds primitive data.
63
How do you access the third element in a one-dimensional array named numbers
numbers.at(3)
numbers[3]
numbers(3)
numbers[2]
64
What is the output of this code?
Error
2
6
4
65
What is encapsulation?
The process of converting objects into primitive data types.
The act of combining multiple classes into a single file.
A technique for hiding the internal implementation details
A method for creating instances of a class.
66
To check if 2 Strings are the same, we should use == operator
False
True
67
What is the scope of a parameter in a method or constructor in Java?
Available to other classes in the same package.
Limited to the method or constructor where it is declared.
Global scope, accessible across all classes in the program.
Accessible throughout the entire class.
68
Which of the following statements about enums is true?
Enums provide a way to represent a set of named, distinct values.
Enums are used to define mathematical operations on numeric values.
Enums can only have string values.
Enums are primarily used for creating graphical user interfaces.
69
Which of these is false about enum?
Cut down on spelling mistakes
Force a list of values that a variable can be set to
Are all in capital letters
Have " " surrounding the value
70
Analyze the following code.
The code displays nothing.
The code is wrong. You should replace if (even) with if (even = true).
The code is wrong. You should replace if (even) with if (even == true).
The code displays It is even!
71
What is the primary purpose of the for-each loop?
To repeatedly execute a block of code based on a specified condition.
To execute a block of code unconditionally.
To simplify the process of iterating over arrays or collections.
To handle exceptions.

W24-Trafalgar-Java Midterm Exam Review Flashcards | StudBud