IO Stream & Multithreading

Which of the following is a character stream class in Java?

• FileInputStream

• FileOutputStream

• FileReader

• ByteArrayInputStream

Which class is used for object serialization in Java?

• ObjectStream

• ObjectOutputStream

• ObjectInput

• FileStream

Which of the following is not true about BufferedReader?

• It is a subclass of Reader

• It provides buffering for character input stream

• It can read a line using readLine()

• It can write characters to a file

What does transient keyword do in Java I/O?

• Allows variable to be serialized

• Prevents variable from being serialized

• Makes a variable static

• Makes variable thread-safe

Which interface must be implemented to create a thread in Java?

• Runnable

• Thread

• RunnableThread

• Executor

What is the purpose of the join() method in Java threads?

• Terminates the thread

• Waits for a thread to die

• Pauses the thread forever

• Interrupts the thread

Which method pauses a thread for a specified time?

• wait()

• sleep()

• pause()

• delay()

Which method reads a single character in Reader class?

• readLine()

• readByte()

• readChar()

• read()

Which exception is thrown when a file is not found during read operation?

• IOException

• FileNotFoundException

• EOFException

• NullPointerException

Which method makes a thread go to waiting state until it is notified?

• sleep()

• wait()

• notify()

• yield()