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Java MCQ: Which of the following is not a real-life example of a Queue? A) Waiting in line to order food at a restaurant B) Waiting in line to buy movie tickets C) Managing tasks on a CPU D) Using a stack of dishes Answer: D) Using a stack of dishes Explanation: Using a stack […]

Java MCQ: Which principle is followed by the Queue data structure? A) LIFO B) FIFO C) LILO D) FILO Answer: B) FIFO Explanation: The principle followed by the Queue data structure is FIFO, which stands for First In First Out. This means that the first element added to the queue will be the first one

Java MCQ: What is the time complexity to get the minimum element from the Stack? A) O(1) B) O(n) C) O(n log n) D) O(n²) Answer: B) O(n) Explanation: If a stack does not maintain a separate data structure to track the minimum element, the time complexity to get the minimum element is O(n). This

Java MCQ: What is another name for the top of the Stack? A) Head B) Front C) Rear D) Peak Answer: D) Peak Explanation: The top of the stack is often referred to as the “peak” or “top.” The term “peak” is used because it represents the highest point of the stack, where the most

Java MCQ: Which of the following applications may use a Stack? A) Recursion B) Parsing C) Browser history D) All of the above Answer: D) All of the above Explanation: All of the listed applications—recursion, parsing, and browser history—use stacks as an underlying data structure to manage their operations. The stack’s Last-In-First-Out (LIFO) behavior is

Java MCQ: Is the Stack a static data structure? A) Yes B) No Answer: B) No Explanation: The stack is not a static data structure; it is dynamic. This means that a stack can grow and shrink at runtime as elements are added and removed. The dynamic nature of the stack makes it flexible and

Java MCQ: What is the maximum number of elements a Stack can hold? A) Stack can hold a limited number of elements B) Stack can hold an infinite number of elements C) It depends on the memory available D) It depends on the data type of the elements Answer: C) It depends on the memory

Java MCQ: What is the time complexity of a push operation in a Stack? A) O(n) B) O(n log n) C) O(1) D) O(n²) Answer: C) O(1) Explanation: The time complexity of a push operation in a stack is O(1), which means that the operation is performed in constant time, regardless of the number of

Java MCQ: What happens when you try to pop an element from an empty Stack? A) It returns null B) It returns the top element C) It causes an underflow D) It causes an overflow Answer: C) It causes an underflow Explanation: When you try to pop an element from an empty stack, it causes

Java MCQ: Which operation is used to remove an element from a Stack? A) Enqueue B) Dequeue C) Push D) Pop Answer: D) Pop Explanation: The operation used to remove an element from a stack is known as “pop.” The pop operation removes the element at the top of the stack, which is the most

Java MCQ: Which operation is used to add an element to a Stack? A) Enqueue B) Dequeue C) Push D) Pop Answer: C) Push Explanation: The operation used to add an element to a stack is known as “push.” The push operation places an element on the top of the stack, adhering to the Last-In-First-Out

Java MCQ: What is the primary function of a Stack data structure? A) LIFO operations B) FIFO operations C) Both LIFO and FIFO operations D) None of the above Answer: A) LIFO operations Explanation: The primary function of a Stack data structure is to perform Last-In-First-Out (LIFO) operations. This means that the last element added

Java MCQ: In Java, is it possible to override a static method? A. Yes, we can override a static method just like we do with instance methods. B. No, static methods cannot be overridden because they belong to the class, not the object. C. It depends on whether the static method is declared as final

Java MCQ: Can interfaces be used to achieve multiple inheritance in Java? A. Yes B. No Answer: A. Yes Explanation: Yes, interfaces in Java can be used to achieve multiple inheritance. While Java does not support multiple inheritance with classes (i.e., a class cannot extend more than one class), it allows a class to implement

Java MCQ: What is a multilevel inheritance in Java? A. A class extends two or more classes B. Two or more classes extend the same class C. A class extends another class which also extends another class D. All of the above Answer: C. A class extends another class which also extends another class Explanation:

Java MCQ: Can a subclass inherit private members of its superclass? A. Yes B. No Answer: B. No Explanation: In Java, a subclass cannot inherit private members (fields and methods) of its superclass. Private members are only accessible within the class in which they are declared, meaning they cannot be accessed directly by subclasses or

Java MCQ: What is the purpose of the ‘super’ keyword in Java? A. To call the constructor of the parent class B. To call a method of the child class C. To create a new instance of a class D. To define a static method Answer: A. To call the constructor of the parent class

Java MCQ: Can we perform multiple inheritance in Java? A. Yes B. No Answer: B. No Explanation: Java does not support multiple inheritance with classes, meaning a class cannot extend more than one class at a time. This decision was made to avoid the complexity and potential ambiguity that can arise from multiple inheritance, such

Java MCQ: What is the parent class of all classes in Java? A. Object B. String C. Class D. System Answer: A. Object Explanation: In Java, the Object class is the root of the class hierarchy. Every class in Java, either directly or indirectly, inherits from the Object class. This means that the Object class

Java MCQ: What is a subclass in Java inheritance? A. The class that inherits from another class B. The class that is inherited from C. The final class in the inheritance chain D. None of the above Answer: A. The class that inherits from another class Explanation: A subclass, also known as a derived class

Java MCQ: Can a class inherit constructors from its superclass in Java? A. Yes B. No Answer: B. No Explanation: In Java, constructors are not inherited by subclasses. A constructor is a special method used to initialize objects, and it has the same name as the class. When a subclass is created, it does not

Java MCQ: Which keyword is used for inheritance in Java? A. extends B. new C. super D. this Answer: A. extends Explanation: The extends keyword in Java is used to indicate that a class is inheriting from another class. When a class is defined with the extends keyword, it becomes a subclass (or child class)

Java MCQ: What is Inheritance in Java programming? A. It’s a process where one class acquires the properties (fields) and behaviors (methods) of another class. B. It’s a process of creating a new class using the main() method. C. It’s a technique to create objects in Java. D. It’s a Java-specific term for importing packages.

Java MCQ: How many bits is the long data type in Java? a) 32 b) 16 c) 64 d) 128 Answer: c) 64 Explanation: The long data type in Java is a 64-bit signed integer. It is used when you need a range of values wider than those provided by int. The long data type

Java MCQ: Which of these is an immutable class in Java? a) StringBuilder b) String c) int d) CharSequence Answer: b) String Explanation: In Java, the String class is immutable, meaning that once a String object is created, its value cannot be changed. Immutability is a key characteristic of the String class, which ensures that