Java Programming

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

Java MCQ: What is the default value of a char in Java? a) 0 b) ‘\0’ c) ‘ ‘ d) null Answer: b) ‘\0’ Explanation: The default value of a char in Java is the null character '\0'. The char data type is a 16-bit Unicode character, which allows it to represent any character in

Java MCQ: Which data type would be most suitable for storing the price of an item in a store? a) int b) double c) boolean d) char Answer: b) double Explanation: The double data type in Java is the most suitable for storing the price of an item in a store because it can handle

Java MCQ: Which of the following is not a primitive data type in Java? a) float b) void c) char d) short Answer: b) void Explanation: In Java, void is not a primitive data type; it is a keyword used to specify that a method does not return a value. Primitive data types in Java

Java MCQ: Which data type value can an int variable not store? a) -32768 b) 100000 c) 2147483648 d) -2147483648 Answer: c) 2147483648 Explanation: In Java, the int data type is a 32-bit signed integer, which means it can store values ranging from -231 (-2,147,483,648) to 231-1 (2,147,483,647). These boundaries are determined by the binary

Java MCQ: Which of the following can be a valid value for a char data type? a) “A” b) ‘A’ c) 65 d) Both b and c Answer: d) Both b and c Explanation: In Java, the char data type is used to store a single 16-bit Unicode character. A char can represent any character

Java MCQ: What is the size of a double data type in Java? a) 4 bytes b) 2 bytes c) 8 bytes d) 16 bytes Answer: c) 8 bytes Explanation: In Java, the double data type is a primitive data type used for storing double-precision 64-bit IEEE 754 floating-point numbers. The size of a double

Java MCQ: What is the default value of a boolean in Java? a) 0 b) false c) null d) undefined Answer: b) false Explanation: In Java, the default value of a boolean data type is false. The boolean type is one of the eight primitive data types in Java, specifically used for storing simple true/false

Java MCQ: Which of the following is a primitive data type in Java? a) String b) int c) Array d) Object Answer: b) int Explanation: In Java, int is one of the eight primitive data types, which are the most basic data types available in the language. Primitive types in Java are predefined by the

Java MCQ: Which loop construct guarantees that the loop body is executed at least once? a) for loop b) while loop c) do-while loop d) continue statement Answer: c) do-while loop Explanation: The do-while loop in Java guarantees that the loop body is executed at least once, regardless of the condition. This is because the