Question: What does the following code fragment print out at line 10?

1. try{
2. FileOutputStream fos = new FileOutputStream("xx");
3. for (byte b=10; b<50; b++)
4. fos.write(b);
5. fos.close();
6. RandomAccessFile raf = new RandomAccessFile("xx","r");
7. raf.seek(10);
8. int i = raf.read();
9. raf.close();
10. System.out.println("i=" + i);
8. }
9. catch (IOException e) {}

A. The output is i = 30.

B. The output is i = 20.

C. The output is i = 10.

D. There is no output because the code throws an exception at line 1.

E. There is no output because the code throws an exception at line 6.

Answer:B is correct. All the code is perfectly legal, so no exceptions are thrown. The first byte in the file is 10, the next byte is 11, the next is 12 and so on. The byte at file position 10 is 20, so the output is i = 20.

Most Viewed Articles (in Certification )

Question: Execute the following code in an empty directory. What is the result?

Question: Which of the following statements are true about File? (Choose none, some , or all)

Question: Consider the following line of code: int x[] = new int[25];

Question: The File class contains a method that changes the current working directory.

Question: How many bytes does the following code write to file destfile?

Sun Certified Java Developer (SCJD) Certification

Question: Readers have methods that can read and return floats and doubles. True or False?

Question: What is result of attempting to compile and execute the code below:

Getting started with Java Certification. (SCJA, SCJP,...SCEA)

Sun Certified Java Associate (SCJA) Certification

Question: Which of the following signatures are valid for the main() method entry point of an application?