- A It allows the method to be called without creating an instance of the class.
- B It ensures that the main method is executed first when the program starts.
- C It enables the main method to access static variables and methods directly.
- D All of the above.
Java Interviews MCQs - Quiz
- A It refers to the current instance of the class.
- B It refers to the superclass of the current class.
- C It refers to the static context of the class.
- D It refers to the object being passed as a parameter to a method.
- A An abstract class is a class that cannot be instantiated and can only be inherited.
- B An abstract class is a class that can be instantiated but cannot be inherited.
- C An abstract class is a class that can only contain abstract methods.
- D An abstract class is a class that can only contain static methods.
- A Object
- B Super
- C Base
- D Main
- A Yes, the main() method can be overloaded in Java.
- B No, the main() method cannot be overloaded in Java.
- C Overloading the main() method is possible, but it is considered bad practice.
- D Overloading the main() method is possible, but it will cause a runtime error.
- A In Java, multiple inheritance is supported, while in C++ it is not.
- B In C++, multiple inheritance is supported, while in Java it is not.
- C In Java, all classes inherit from a common superclass, while in C++ they do not.
- D In C++, classes can have multiple levels of inheritance, while in Java they cannot.
- A A blank final variable is a variable that is not assigned any initial value and remains constant throughout the program.
- B A blank final variable is a variable that is declared with the "final" keyword but can be assigned a value later in the program.
- C A blank final variable is a variable that is declared without any data type specified.
- D A blank final variable is a variable that is not declared with any modifiers or keywords.
- A A static variable is a variable that is accessible only within the static methods of a class.
- B A static variable is a variable that is shared among all instances of a class and is not specific to any particular instance.
- C A static variable is a variable that is declared with the "static" keyword and cannot be changed once assigned a value.
- D A static variable is a variable that is declared inside a static block in a class.
- A HashMap allows null values and is not synchronized, while HashTable does not allow null values and is synchronized.
- B HashTable allows null values and is not synchronized, while HashMap does not allow null values and is synchronized.
- C Both HashMap and HashTable allow null values, but HashMap is not synchronized while HashTable is synchronized.
- D Both HashMap and HashTable do not allow null values, but HashMap is synchronized while HashTable is not synchronized.
- A Java objects are stored in a stack memory.
- B Java objects are stored in a heap memory.
- C Java objects are stored in a separate memory space called the "object memory."
- D Java objects are stored in a cache memory.
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Java Interviews MCQs - Quiz
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- A. It allows the method to be called without creating an instance of the class.
- B. It ensures that the main method is executed first when the program starts.
- C. It enables the main method to access static variables and methods directly.
- D. All of the above.
Remarks:
Explanation:
The main method in Java is declared as static so that it can be called without creating an instance of the class. This is because the main method is the entry point of the program and needs to be executed first when the program starts. Additionally, the main method is declared as static so that it can access static variables and methods directly without the need to create an instance of the class.
- A. It refers to the current instance of the class.
- B. It refers to the superclass of the current class.
- C. It refers to the static context of the class.
- D. It refers to the object being passed as a parameter to a method.
Remarks:
Explanation:
The keyword "this" in Java refers to the current instance of the class. It is used to refer to the instance variables and methods of the current object. It can also be used to pass the current object as an argument to a method.
- A. An abstract class is a class that cannot be instantiated and can only be inherited.
- B. An abstract class is a class that can be instantiated but cannot be inherited.
- C. An abstract class is a class that can only contain abstract methods.
- D. An abstract class is a class that can only contain static methods.
Remarks:
Explanation:
An abstract class is a class that cannot be instantiated and can only be inherited. It is a class that is declared with the abstract keyword and may contain both abstract and non-abstract methods. Abstract classes cannot be instantiated, and it is designed to be inherited by other classes. Abstract classes may contain static data members.
- A. Object
- B. Super
- C. Base
- D. Main
Remarks:
Explanation:
In Java, the Object class is the superclass for every class. It is the root of the class hierarchy and provides the basic functionality of all classes. It is the parent class of all other classes and provides the fundamental methods and variables that are inherited by all classes. Object class methods are clone(), equals(), finalize(), getClass(), hashCode(), notify(), notifyAll(), toString(), and wait().
- A. Yes, the main() method can be overloaded in Java.
- B. No, the main() method cannot be overloaded in Java.
- C. Overloading the main() method is possible, but it is considered bad practice.
- D. Overloading the main() method is possible, but it will cause a runtime error.
Remarks:
Explanation:
The main() method can be overloaded in Java, meaning that multiple versions of the main() method can be created with different parameters. This is useful when the program needs to be executed with different sets of arguments. However, it is considered bad practice to overload the main() method as it can lead to confusion and errors.
- A. In Java, multiple inheritance is supported, while in C++ it is not.
- B. In C++, multiple inheritance is supported, while in Java it is not.
- C. In Java, all classes inherit from a common superclass, while in C++ they do not.
- D. In C++, classes can have multiple levels of inheritance, while in Java they cannot.
Remarks:
Explanation:
In Java, multiple inheritance is supported, while in C++ it is not. This means that a class in Java can inherit from multiple classes, while in C++ a class can only inherit from one class. In addition, in Java all classes inherit from a common superclass, while in C++ they do not. Furthermore, in C++ classes can have multiple levels of inheritance, while in Java they cannot.
- A. A blank final variable is a variable that is not assigned any initial value and remains constant throughout the program.
- B. A blank final variable is a variable that is declared with the "final" keyword but can be assigned a value later in the program.
- C. A blank final variable is a variable that is declared without any data type specified.
- D. A blank final variable is a variable that is not declared with any modifiers or keywords.
Remarks:
Explanation:
A blank final variable is a variable that is declared with the "final" keyword and cannot be changed or reassigned once it has been initialized. It is a constant value that remains the same throughout the program.
- A. A static variable is a variable that is accessible only within the static methods of a class.
- B. A static variable is a variable that is shared among all instances of a class and is not specific to any particular instance.
- C. A static variable is a variable that is declared with the "static" keyword and cannot be changed once assigned a value.
- D. A static variable is a variable that is declared inside a static block in a class.
Remarks:
Explanation:
A static variable in Java is a variable that is declared with the "static" keyword and cannot be changed once assigned a value. It is accessible from anywhere within the class, but not from outside the class. It is also shared among all instances of a class, meaning that any changes made to the static variable will be reflected in all instances of the class.
- A. HashMap allows null values and is not synchronized, while HashTable does not allow null values and is synchronized.
- B. HashTable allows null values and is not synchronized, while HashMap does not allow null values and is synchronized.
- C. Both HashMap and HashTable allow null values, but HashMap is not synchronized while HashTable is synchronized.
- D. Both HashMap and HashTable do not allow null values, but HashMap is synchronized while HashTable is not synchronized.
Remarks:
Explanation:
The main difference between HashMap and HashTable is that HashMap allows null values while HashTable does not. Additionally, HashMap is not synchronized, meaning that multiple threads can access it simultaneously, while HashTable is synchronized, meaning that only one thread can access it at a time.
- A. Java objects are stored in a stack memory.
- B. Java objects are stored in a heap memory.
- C. Java objects are stored in a separate memory space called the "object memory."
- D. Java objects are stored in a cache memory.
Remarks:
Explanation:
Java objects are stored in a heap memory, which is a section of memory that is shared among all threads in a process. The heap memory is managed by the JVM and is used to store objects and their associated data. The heap memory is divided into two parts: the young generation and the old generation. The young generation is used to store newly created objects, while the old generation is used to store objects that have been around for a while. The JVM also uses the heap memory to store static variables and class metadata.