What this deck covers
This deck focuses on Using Text Files, giving you a quick way to review the definitions, rules, and examples that matter most for AP Computer Science a.
AP Computer Science a Flashcards: Using Text Files
Study Using Text Files in AP Computer Science a with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.
AP Computer Science a
Using Text Files
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What is the method to close a text file in Java?
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ANSWER
close(). Essential method to release system resources after file operations.
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Flashcard 1: What is the method to close a text file in Java?
Answer: close(). Essential method to release system resources after file operations.
Flashcard 2: What does the method ready() in BufferedReader return?
Answer: boolean. Returns true if the stream has data available to read without blocking.
Flashcard 3: What is the function of the File.exists() method?
Answer: Checks if a file exists. Returns true if the file or directory exists on the file system.
Flashcard 4: Which Java class is used to write data to a text file?
Answer: FileWriter. Standard class for writing character data to files.
Flashcard 5: Identify the method to read a line of text from a file in Java.
Answer: readLine(). BufferedReader method that reads one complete line as a String.
Flashcard 6: Which method retrieves the last modified time of a file?
Answer: lastModified(). Returns timestamp of when the file was last modified.
Flashcard 7: What does the File.length() method return?
Answer: Size of the file in bytes. Returns the number of bytes contained in the file.
Flashcard 8: What is the method to get the name of a file in Java?
Answer: getName(). Returns just the filename without the directory path.
Flashcard 9: Identify the method to list files in a directory.
Answer: list() or listFiles(). Returns array of filenames or File objects in the directory.
Flashcard 10: What is the purpose of BufferedWriter in Java?
Answer: To write text efficiently. Wraps FileWriter to provide buffered writing for better performance.
Flashcard 11: Which method checks if a File object is a directory?
Answer: isDirectory(). Returns true if the File object represents a directory rather than a file.
Flashcard 12: What is the use of the PrintWriter class in Java?
Answer: To write formatted text. Provides convenient methods like println() for formatted text output.
Flashcard 13: What is the use of the PrintWriter class in Java?
Answer: To write formatted text. Provides convenient methods like println() for formatted text output.
Flashcard 14: Which keyword is used to handle exceptions when reading files?
Answer: try-catch. Exception handling structure required for file operations that can throw IOException.
Flashcard 15: What does the method File.canWrite() check?
Answer: If file is writable. Returns true if the application can write to the file.
Flashcard 16: What is the return type of the readLine() method in Java?
Answer: String. Returns a String containing the line content, or null if end of file.
Flashcard 17: How to create a new file in Java?
Answer: createNewFile(). Creates a new empty file if it doesn't already exist.
Flashcard 18: Which Java class provides methods for file manipulation?
Answer: File. Provides methods for file system operations like create, delete, rename.
Flashcard 19: What is the purpose of BufferedWriter in Java?
Answer: To write text efficiently. Wraps FileWriter to provide buffered writing for better performance.
Flashcard 20: How to create a new file in Java?
Answer: createNewFile(). Creates a new empty file if it doesn't already exist.
Flashcard 21: What is the return type of the readLine() method in Java?
Answer: String. Returns a String containing the line content, or null if end of file.
Flashcard 22: Which class should be used to append text to an existing file?
Answer: FileWriter with append mode. Constructor parameter true enables appending instead of overwriting.
Flashcard 23: Which method retrieves the last modified time of a file?
Answer: lastModified(). Returns timestamp of when the file was last modified.
Flashcard 24: What is the method to close a text file in Java?
Answer: close(). Essential method to release system resources after file operations.
Flashcard 25: Which Java class is used to write data to a text file?
Answer: FileWriter. Standard class for writing character data to files.
Flashcard 26: What exception is commonly thrown when file operations fail?
Answer: IOException. Checked exception thrown when file operations encounter errors.
Flashcard 27: What does the method File.canWrite() check?
Answer: If file is writable. Returns true if the application can write to the file.
Flashcard 28: What exception is commonly thrown when file operations fail?
Answer: IOException. Checked exception thrown when file operations encounter errors.
Flashcard 29: Which method is used to get the parent directory of a file?
Answer: getParent(). Returns the parent directory path as a String.
Flashcard 30: What method is used to rename a file in Java?
Answer: renameTo(). Renames the file to the path specified by the parameter.
Flashcard 31: What is the purpose of BufferedReader in Java?
Answer: To read text efficiently. Wraps FileReader to provide buffered reading for better performance.
Flashcard 32: Which Java class is used to create a directory?
Answer: File. File class provides mkdirs() method to create directory structures.
Flashcard 33: What does the method ready() in BufferedReader return?
Answer: boolean. Returns true if the stream has data available to read without blocking.
Flashcard 34: What is the function of the File.exists() method?
Answer: Checks if a file exists. Returns true if the file or directory exists on the file system.
Flashcard 35: Which method is used to write a line of text to a file?
Answer: write(). FileWriter method to output text data to the file.
Flashcard 36: Which method is used to get the parent directory of a file?
Answer: getParent(). Returns the parent directory path as a String.
Flashcard 37: Identify the method to read a line of text from a file in Java.
Answer: readLine(). BufferedReader method that reads one complete line as a String.
Flashcard 38: Which method retrieves the absolute path of a file?
Answer: getAbsolutePath(). Returns the complete path from the root directory.
Flashcard 39: Which method is used to flush the output stream in Java?
Answer: flush(). Forces any buffered output to be written to the file immediately.
Flashcard 40: Which class should be used to append text to an existing file?
Answer: FileWriter with append mode. Constructor parameter true enables appending instead of overwriting.
Flashcard 41: What method is used to rename a file in Java?
Answer: renameTo(). Renames the file to the path specified by the parameter.
Flashcard 42: Identify the method to list files in a directory.
Answer: list() or listFiles(). Returns array of filenames or File objects in the directory.
Flashcard 43: Which method retrieves the absolute path of a file?
Answer: getAbsolutePath(). Returns the complete path from the root directory.
Flashcard 44: Which Java package contains classes for file I/O operations?
Answer: java.io. Contains classes like FileReader, FileWriter, BufferedReader for file operations.
Flashcard 45: What does the method File.canRead() check?
Answer: If file is readable. Returns true if the application can read from the file.
Flashcard 46: What does the method File.canRead() check?
Answer: If file is readable. Returns true if the application can read from the file.
Flashcard 47: What is the method to get the name of a file in Java?
Answer: getName(). Returns just the filename without the directory path.
Flashcard 48: Which method checks if a File object is a directory?
Answer: isDirectory(). Returns true if the File object represents a directory rather than a file.
Flashcard 49: Which method deletes a file in Java?
Answer: delete(). Removes the file from the file system permanently.
Flashcard 50: Which Java package contains classes for file I/O operations?
Answer: java.io. Contains classes like FileReader, FileWriter, BufferedReader for file operations.
Flashcard 51: Which keyword is used to handle exceptions when reading files?
Answer: try-catch. Exception handling structure required for file operations that can throw IOException.
Flashcard 52: Which Java class is used to create a directory?
Answer: File. File class provides mkdirs() method to create directory structures.
Flashcard 53: Identify the method to check end-of-file in BufferedReader.
Answer: read() returns -1. When read() returns -1, it indicates no more data is available.
Flashcard 54: Which method deletes a file in Java?
Answer: delete(). Removes the file from the file system permanently.
Flashcard 55: What does the File.length() method return?
Answer: Size of the file in bytes. Returns the number of bytes contained in the file.
Flashcard 56: Which method is used to write a line of text to a file?
Answer: write(). FileWriter method to output text data to the file.
Flashcard 57: Identify the method to check end-of-file in BufferedReader.
Answer: read() returns -1. When read() returns -1, it indicates no more data is available.
Flashcard 58: Which method is used to flush the output stream in Java?
Answer: flush(). Forces any buffered output to be written to the file immediately.
Flashcard 59: Which Java class provides methods for file manipulation?
Answer: File. Provides methods for file system operations like create, delete, rename.
Flashcard 60: What is the purpose of BufferedReader in Java?
Answer: To read text efficiently. Wraps FileReader to provide buffered reading for better performance.