Java File Writing

Here are 10 essential multiple-choice questions on Java File Writing, covering key concepts.

Last Updated : Apr 4, 2025

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Question 1

Which Java class is primarily used to write character data to files?

A
FileReader
B
FileWriter
C
FileInputStream
D
BufferedReader

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Question 2

What happens if FileWriter is constructed without append = true?

A
Data is added to the end of the file
B
Existing data remains unchanged
C
File is deleted
D
File content is overwritten

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Question 3

Which method is used to write a single character using FileWriter?

A
append()
B
writeChar()
C
write()
D
print()

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Question 4

What is the output of this code?

Java

FileWriter fw = new FileWriter("data.txt");
fw.write("Test");
fw.close();

A
Throws error
B
Appends to file
C
Overwrites with "Test"
D
No change in file

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Question 5

How do you ensure data is flushed from memory to file?

A
fw.flush()
B
fw.write()
C
fw.append()
D
fw.end()

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Question 6

Which class provides buffering for efficient writing of text data to files?

A
FileReader
B
FileInputStream
C
BufferedWriter
D
PrintStream

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Question 7

What does the append() method of FileWriter do?

A
Replaces the existing file content
B
Adds text to the beginning of the file
C
Adds text to the end of the file
D
Creates a new file always

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Question 8

Which constructor appends data instead of overwriting using FileWriter?

A
new FileWriter("a.txt")
B
new FileWriter("a.txt", true)
C
new FileWriter("a.txt", false)
D
new FileWriter(new File("a.txt"))

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Question 9

Which of the following correctly closes the FileWriter?

A
fw.stop()
B
fw.flush()
C
fw.close()
D
fw.dispose()

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Question 10

What should be done to avoid resource leaks when writing to a file?

A
Call flush() only
B
Use BufferedReader
C
Use FileWriter without closing
D
Use try-with-resources

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