Questions and answers

Which is better FileWriter or BufferedWriter?

Which is better FileWriter or BufferedWriter?

FileWriter writes directly into Files and should be used only when the number of writes is less. BufferedWriter: BufferedWriter is almost similar to FileWriter but it uses internal buffer to write data into File. So if the number of write operations is more, the actual IO operations are less and performance is better.

What is the difference between FileWriter and FileOutputStream?

FileWriter is a Writer that talks to files. Since a Java String internally uses chars (16 bit so they can handle Unicode), FileWriter is the natural class for use with Unicode Strings. FileOutputStream is an OutputStream for writing bytes to a file.

What does BufferedWriter do?

Java BufferedWriter class is used to provide buffering for Writer instances. It makes the performance fast. It inherits Writer class. The buffering characters are used for providing the efficient writing of single arrays, characters, and strings.

What is the difference between PrintWriter and FileWriter?

PrintWriter gives you some handy methods for formatting like println and printf . So if you need to write printed text – you can use it. FileWriter is more like “low-level” writer that gives you ability to write only strings and char arrays.

Does FileWriter overwrite?

When you create a Java FileWriter you can decide if you want to overwrite any existing file with the same name, or if you want to append to any existing file.

Will FileWriter create a file?

FileWriter(String fileName) : Creates a FileWriter object using specified fileName. It throws an IOException if the named file exists but is a directory rather than a regular file or does not exist but cannot be created, or cannot be opened for any other reason.

What is Java FileWriter?

Java FileWriter class of package is used to write data in character form to file. FileWriter is meant for writing streams of characters. For writing streams of raw bytes, consider using a FileOutputStream. FileWriter creates the output file if it is not present already.

What is FileOutputStream in Java?

FileOutputStream is an outputstream for writing data/streams of raw bytes to file or storing data to file. FileOutputStream is a subclass of OutputStream. To write primitive values into a file, we use FileOutputStream class.

What’s the difference between scanner and BufferedReader?

Scanner and BufferReader both classes are used to read input from external system. Scanner is normally used when we know input is of type string or of primitive types and BufferReader is used to read text from character streams while buffering the characters for efficient reading of characters.

Why BufferedReader is faster than FileReader?

BufferedReader#readLine() method is called, characters of a line stored in the buffer, are returned as a String. It saves lots of time and hence is faster than FileReader#read() method….Difference Between BufferedReader and FileReader in Java.

Basis BufferedReader FileReader
Speed Faster Slower
Efficiency Much more efficient for reading files Less efficient

What is FileWriter and PrintWriter in Java?

PrintWriter has an optional constructor you may use to enable auto-flushing when specific methods are called. No such option exists in FileWriter. When writing to files, FileWriter has an optional constructor which allows it to append to the existing file when the “write()” method is called.