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Java MCQ: How do you read an object from a file in Java? a) readObject() b) loadObject() c) deserializeObject() d) restoreObject() Answer: a) readObject() Explanation: The readObject() method in Java is used to read an object from a file, enabling the process of deserialization. Deserialization is the reverse process of serialization, where a byte stream […]

Java MCQ: How do you write an object to a file in Java? a) writeObject() b) saveObject() c) serializeObject() d) storeObject() Answer: a) writeObject() Explanation: The writeObject() method in Java is used to write an object to a file, enabling the process of serialization. Serialization is the process of converting an object into a byte

Java MCQ: How do you get the size of a file in bytes using Java? a) getSize() b) size() c) length() d) fileSize() Answer: c) length() Explanation: The length() method in Java is used to get the size of a file in bytes. It is a method of the File class, which is part of

Java MCQ: Which class is used to read data from a file using DataInputStream in Java? a) DataReader b) DataInputStream c) FileInputStream d) BufferedInputStream Answer: b) DataInputStream Explanation: The DataInputStream class in Java is used to read primitive data types from an input stream in a machine-independent way. It is part of the java.io package

Java MCQ: Which method is used to read a file using BufferedInputStream in Java? a) read() b) readBytes() c) readLine() d) readData() Answer: a) read() Explanation: The read() method in Java is used to read data from a file using the BufferedInputStream class. BufferedInputStream is part of the java.io package and is used to read

Java MCQ: Which method is used to read a file using BufferedReader in Java? a) readLine() b) read() c) readFile() d) readText() Answer: a) readLine() Explanation: The readLine() method in Java is used to read a file line by line using the BufferedReader class. BufferedReader is part of the java.io package and is used to

Java MCQ: Which method is used to append data to an existing file in Java? a) appendFile() b) write() c) append() d) writeTo() Answer: b) write() Explanation: The write() method can be used to append data to an existing file in Java when used with the appropriate constructor of FileWriter or BufferedWriter. When creating a

Java MCQ: Which method is used to rename a file in Java? a) renameFile() b) rename() c) renameTo() d) changeName() Answer: c) renameTo() Explanation: The renameTo() method in Java is used to rename a file or directory. It is a method of the File class, which is part of the java.io package. This method allows

Java MCQ: Which method is used to move a file in Java? a) moveFile() b) move() c) Files.move() d) FileUtils.move() Answer: c) Files.move() Explanation: The Files.move() method, available in the java.nio.file package, is used to move files or directories from one location to another in Java. This method can also be used to rename files

Java MCQ: How can you copy a file in Java? a) Using copyFile() method b) Using Files.copy() method c) Using FileUtils.copy() method d) Using copy() method of File class Answer: b) Using Files.copy() method Explanation: The Files.copy() method, available in the java.nio.file package, is used to copy files or directories in Java. This method provides

Java MCQ: Which method is used to delete a file in Java? a) deleteFile() b) removeFile() c) delete() d) eraseFile() Answer: c) delete() Explanation: The delete() method in Java is used to delete a file or an empty directory. It is a method of the File class, which is part of the java.io package. When

Java MCQ: Which method is used to write data to a file in Java? a) writeFile() b) write() c) writeBytes() d) writeToFile() Answer: b) write() Explanation: The write() method in Java is commonly used to write data to a file. This method is available in several classes, such as FileWriter, BufferedWriter, and OutputStream, each serving

Java MCQ: Which method is used to create a file in Java? a) createFile() b) newFile() c) createNewFile() d) makeFile() Answer: c) createNewFile() Explanation: The createNewFile() method in Java is used to create a new file. It is a method of the File class, which is part of the java.io package. When you call createNewFile(),

Java MCQ: What is the purpose of wildcards in Java Generics? a) To allow flexibility in specifying types b) To enforce strict type constraints c) To convert types at runtime d) To eliminate the need for type parameters Answer: a) To allow flexibility in specifying types Explanation: Wildcards in Java Generics are used to allow

Java MCQ: What is a bounded type parameter in Java Generics? a) A type parameter that is restricted to a specific set of types b) A type parameter that can only be used with primitive types c) A type parameter that is automatically inferred d) A type parameter that does not allow null values Answer:

Java MCQ: Which of the following is true about generic methods in Java? a) They can be defined with a type parameter that is specified at the method level b) They can only operate on objects of a specific type c) They cannot be overloaded d) They are less flexible than regular methods Answer: a)

Java MCQ: What does a generic type in Java allow? a) The creation of a class, interface, or method that works with any data type b) The automatic conversion of data types c) The creation of methods with multiple return types d) The use of primitive data types only Answer: a) The creation of a

Java MCQ: Which of the following is NOT a benefit of using Generics in Java? a) Code reusability b) Runtime type checking c) Type safety d) Elimination of type casting Answer: b) Runtime type checking Explanation: Generics in Java offer several benefits, including code reusability, type safety, and the elimination of explicit type casting. However,

Java MCQ: What is the primary purpose of Generics in Java? a) To allow code reusability and type safety b) To increase performance c) To simplify syntax d) To avoid using collections Answer: a) To allow code reusability and type safety Explanation: The primary purpose of Generics in Java is to provide a mechanism for

Java MCQ: Which class provides system-independent server-side implementation? a) Socket b) ServerSocket c) DatagramSocket d) None of the above Answer: b) ServerSocket Explanation: The ServerSocket class in Java provides a system-independent mechanism for server-side socket communication. It listens for requests on a specified port and establishes a connection with clients. Reference links: https://www.rameshfadatare.com/learn-java-programming/ https://www.javaguides.net/p/java-tutorial-learn-java-programming.html

Java MCQ: What is the numerical range of a char data type in Java? a) 0 to 32767 b) 0 to 65535 c) 0 to 256 d) 0 to 1024 Answer: b) 0 to 65535 Explanation: The char data type in Java is a 16-bit Unicode character. The numerical range of char is from 0

Java MCQ: Which one of the following is not an access modifier? a) protected b) void c) private d) public Answer: b) void Explanation: void is not an access modifier; it is a return type used for methods that do not return any value. The access modifiers in Java are public, protected, private, and the

Java MCQ: Which of these keywords is used for the block to be examined for exceptions? a) try b) catch c) throw d) throws Answer: a) try Explanation: The try block is used in Java to specify a block of code that will be examined for exceptions. If an exception is thrown within this block,

Java MCQ: Which of these statements is incorrect about Thread? a) run() method is used to begin execution of a thread b) run() method is called automatically after the start() method is called c) A thread can be created by implementing Runnable interface and overriding the run() method d) A thread can be created by

Java MCQ: Which of these packages contains the exception StackOverflow in Java? a) java.lang b) java.util c) java.io d) java.net Answer: a) java.lang Explanation: The StackOverflowError in Java is part of the java.lang package. It is thrown when a stack overflow occurs because an application recurses too deeply. Reference links: https://www.rameshfadatare.com/learn-java-programming/ https://www.javaguides.net/p/java-tutorial-learn-java-programming.html