Practice 70 Java File Input-Output Programming Questions

Practice 70 Java File Input-Output Programming Questions

Q1. Write a Java program to create a new file.
  - Input: File name: "testfile.txt"
  - Expected Output: "testfile.txt" created.

Q2. Write a Java program to write some text to a file.
  - Input: "Hello, Java!"
  - Expected Output: "Hello, Java!" written to "file.txt"

Q3. Write a Java program to read the contents of a file.
  - Input: File: "testfile.txt"
  - Expected Output: Content: "Hello, Java!"

Q4. Write a Java program to check if a file exists.
  - Input: File: "testfile.txt"
  - Expected Output: True

Q5. Write a Java program to delete a file.
  - Input: File: "testfile.txt"
  - Expected Output: "testfile.txt" deleted

Q6. Write a Java program to rename a file.
  - Input: Old name: "testfile.txt", New name: "renamedfile.txt"
  - Expected Output: File renamed to "renamedfile.txt"

Q7. Write a Java program to append text to an existing file.
  - Input: Text to append: "Welcome to Java"
  - Expected Output: "Welcome to Java" appended to "testfile.txt"

Q8. Write a Java program to copy a file from one location to another.
  - Input: Source: "sourcefile.txt", Destination: "destinationfile.txt"
  - Expected Output: "sourcefile.txt" copied to "destinationfile.txt"

Q9. Write a Java program to read a file line by line.
  - Input: File: "testfile.txt"
  - Expected Output: Prints each line of "testfile.txt"

Q10. Write a Java program to write an array of strings to a file.
   - Input: ["Hello", "Java", "Programming"]
   - Expected Output: Each string written to "file.txt" on a new line.

Q11. Write a Java program to create a directory.
   - Input: Directory name: "testdirectory"
   - Expected Output: Directory "testdirectory" created.

Q12. Write a Java program to list all files in a directory.
   - Input: Directory: "testdirectory"
   - Expected Output: List of files in "testdirectory"

Q13. Write a Java program to check if a file is readable.
   - Input: File: "testfile.txt"
   - Expected Output: True

Q14. Write a Java program to check if a file is writable.
   - Input: File: "testfile.txt"
   - Expected Output: True

Q15. Write a Java program to get the size of a file.
   - Input: File: "testfile.txt"
   - Expected Output: Size of "testfile.txt" in bytes

Q16. Write a Java program to read the first 5 characters from a file.
   - Input: File: "testfile.txt"
   - Expected Output: First 5 characters of "testfile.txt"

Q17. Write a Java program to write data to a file using FileWriter.
   - Input: Text: "Java is fun!"
   - Expected Output: "Java is fun!" written to "testfile.txt"

Q18. Write a Java program to read data from a file using FileReader.
   - Input: File: "testfile.txt"
   - Expected Output: Content of "testfile.txt"

Q19. Write a Java program to check the length of a file.
   - Input: File: "testfile.txt"
   - Expected Output: Length of "testfile.txt" in bytes

Q20. Write a Java program to write and then read from a file.
   - Input: Text: "Java programming"
   - Expected Output: Write "Java programming" to the file and read it back.

Q21. Write a Java program to write a list of strings to a file.
   - Input: List: ["Hello", "World"]
   - Expected Output: Each string written to a new line in "outputfile.txt"

Q22. Write a Java program to read content from a file and print the number of lines.
   - Input: File: "testfile.txt"
   - Expected Output: Number of lines in "testfile.txt"

Q23. Write a Java program to read and print all the characters from a file.
   - Input: File: "testfile.txt"
   - Expected Output: Print all characters from "testfile.txt"

Q24. Write a Java program to create a file and check if it is created successfully.
   - Input: File name: "newfile.txt"
   - Expected Output: File "newfile.txt" created successfully

Q25. Write a Java program to find the absolute path of a file.
   - Input: File: "testfile.txt"
   - Expected Output: Absolute path of "testfile.txt"

Q26. Write a Java program to create a file and write multiple lines to it.
   - Input: Lines: ["Hello", "Java", "Programming"]
   - Expected Output: Write each line to "newfile.txt"

Q27. Write a Java program to read the contents of a file and print each word.
   - Input: File: "testfile.txt"
   - Expected Output: Print each word from "testfile.txt"

Q28. Write a Java program to read a file and store its content into an array of strings.
   - Input: File: "testfile.txt"
   - Expected Output: Array containing each line of "testfile.txt"

Q29. Write a Java program to write numbers 1-10 to a file.
   - Input: Numbers 1, 2, 3, ..., 10
   - Expected Output: Numbers 1-10 written to "numbers.txt"

Q30. Write a Java program to read a file using BufferedReader.
   - Input: File: "testfile.txt"
   - Expected Output: Read content of "testfile.txt" using BufferedReader

Q31. Write a Java program to write a string to a file using BufferedWriter.
   - Input: String: "Buffered writing example"
   - Expected Output: Write the string to "bufferedfile.txt"

Q32. Write a Java program to check if a directory exists.
   - Input: Directory: "testdirectory"
   - Expected Output: True

Q33. Write a Java program to list all directories in a parent directory.
   - Input: Parent Directory: "parentdirectory"
   - Expected Output: List of subdirectories in "parentdirectory"

Q34. Write a Java program to copy contents of one directory to another directory.
   - Input: Source directory: "dir1", Destination directory: "dir2"
   - Expected Output: Copy all files from "dir1" to "dir2"

Q35. Write a Java program to find the last modified time of a file.
   - Input: File: "testfile.txt"
   - Expected Output: Last modified time of "testfile.txt"

Q36. Write a Java program to find the file extension of a file.
   - Input: File: "testfile.txt"
   - Expected Output: ".txt"

Q37. Write a Java program to create a new file if it doesn't exist.
   - Input: File: "newfile.txt"
   - Expected Output: "newfile.txt" created if not already present

Q38. Write a Java program to get the parent directory of a file.
   - Input: File: "testfile.txt"
   - Expected Output: Parent directory of "testfile.txt"

Q39. Write a Java program to check if a directory is empty.
   - Input: Directory: "testdirectory"
   - Expected Output: True or False depending on contents

Q40. Write a Java program to get the name of a file.
   - Input: File: "testfile.txt"
   - Expected Output: "testfile.txt"

Q41. Write a Java program to write a number to a file.
   - Input: Number: 123
   - Expected Output: Number 123 written to "numberfile.txt"

Q42. Write a Java program to check if a file is hidden.
   - Input: File: "testfile.txt"
   - Expected Output: True or False based on file properties

Q43. Write a Java program to read a file and print its contents in reverse order.
   - Input: File: "testfile.txt"
   - Expected Output: Print content of "testfile.txt" in reverse

Q44. Write a Java program to create a file and write user input to it.
   - Input: User Input: "Hello User!"
   - Expected Output: "Hello User!" written to "userinputfile.txt"

Q45. Write a Java program to append text to an existing file if it exists.
   - Input: Text to append: "New line added"
   - Expected Output: Text appended to "existingfile.txt"

Q46. Write a Java program to get the absolute path of a directory.
   - Input: Directory: "testdirectory"
   - Expected Output: Absolute path of "testdirectory"

Q47. Write a Java program to check if a file is a directory.
   - Input: File: "testfile.txt"
   - Expected Output: False

Q48. Write a Java program to read a file and count the number of characters.
   - Input: File: "testfile.txt"
   - Expected Output: Number of characters in "testfile.txt"

Q49. Write a Java program to read a file and count the number of words.
   - Input: File: "testfile.txt"
   - Expected Output: Number of words in "testfile.txt"

Q50. Write a Java program to check if a file can be executed.
   - Input: File: "testfile.txt"
   - Expected Output: True or False depending on file properties

Q51. Write a Java program to create a file and write some data from an array.
   - Input: Array: ["Hello", "World"]
   - Expected Output: Data written from the array to "outputfile.txt"

Q52. Write a Java program to read a file and print each line with line numbers.
   - Input: File: "testfile.txt"
   - Expected Output: Line 1: "Hello", Line 2: "Java"

Q53. Write a Java program to list files in a directory that match a pattern.
   - Input: Directory: "testdirectory", Pattern: "*.txt"
   - Expected Output: List of files in "testdirectory" with ".txt" extension

Q54. Write a Java program to create a file and check if the file can be deleted.
   - Input: File: "deletablefile.txt"
   - Expected Output: File "deletablefile.txt" can be deleted

Q55. Write a Java program to read and print the last line of a file.
   - Input: File: "testfile.txt"
   - Expected Output: Last line of "testfile.txt"

Q56. Write a Java program to list the contents of a directory in a sorted order.
   - Input: Directory: "testdirectory"
   - Expected Output: Sorted list of files in "testdirectory"

Q57. Write a Java program to check if a file is a symbolic link.
   - Input: File: "testfile.txt"
   - Expected Output: True or False depending on file type

Q58. Write a Java program to check if a file is a regular file.
   - Input: File: "testfile.txt"
   - Expected Output: True or False

Q59. Write a Java program to find the number of directories in a given path.
   - Input: Directory: "testdirectory"
   - Expected Output: Number of directories in "testdirectory"

Q60. Write a Java program to create a file and then delete it after some time.
   - Input: File: "testfile.txt"
   - Expected Output: File "testfile.txt" created and deleted after a delay

Q61. Write a Java program to read all lines from a file using Files class.
   - Input: File: "testfile.txt"
   - Expected Output: All lines read from "testfile.txt"

Q62. Write a Java program to write data to a file using PrintWriter.
   - Input: Text: "Hello World"
   - Expected Output: "Hello World" written to "printfile.txt"

Q63. Write a Java program to create a file if it does not exist and write to it.
   - Input: File: "newfile.txt", Text: "Welcome"
   - Expected Output: "Welcome" written to "newfile.txt"

Q64. Write a Java program to check the last modified time of a file.
   - Input: File: "testfile.txt"
   - Expected Output: Last modified time of "testfile.txt"

Q65. Write a Java program to read and print the contents of a file in chunks.
   - Input: File: "testfile.txt"
   - Expected Output: Print content of "testfile.txt" in chunks

Q66. Write a Java program to read a file and store its contents into a string.
   - Input: File: "testfile.txt"
   - Expected Output: Store the content of "testfile.txt" into a string

Q67. Write a Java program to write data from a byte array to a file.
   - Input: Byte Array: [65, 66, 67]
   - Expected Output: Byte data written to "file.txt"

Q68. Write a Java program to create a temporary file.
   - Input: File name: "tempfile.txt"
   - Expected Output: Temporary file "tempfile.txt" created

Q69. Write a Java program to get the last modified time of a directory.
   - Input: Directory: "testdirectory"
   - Expected Output: Last modified time of "testdirectory"

Q70. Write a Java program to delete a directory and its contents recursively.
   - Input: Directory: "testdirectory"
   - Expected Output: "testdirectory" deleted along with its contents