What does InputStreamReader do in Java?

An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset . The charset that it uses may be specified by name or may be given explicitly, or the platform’s default charset may be accepted.

What is Java IO InputStreamReader?

The Java. io. InputStreamReader class is a bridge from byte streams to character streams.It reads bytes and decodes them into characters using a specified charset.

What is InputStreamReader and BufferedReader in Java?

BufferedReader reads a couple of characters from the Input Stream and stores them in a buffer. InputStreamReader reads only one character from the input stream and the remaining characters still remain in the streams hence There is no buffer in this case.

How do I read InputStreamReader?


  1. public class InputStreamReaderExample {
  2. public static void main(String[] args) {
  3. try {
  4. InputStream stream = new FileInputStream(“file.txt”);
  5. Reader reader = new InputStreamReader(stream);
  6. int data = reader.read();
  7. while (data != -1) {
  8. System.out.print((char) data);

What is the use of InputStreamReader and OutputStreamWriter?

When should I use InputStreamReader and OutputStreamWriter? From the Java Tutorial site, we know InputStreamReader and OutputStreamWriter can convert streams between bytes and characters. InputStreamReader converts bytes read from input to characters, while OutputStreamWriter converts characters to bytes to output.

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Why BufferedReader is used in Java?

BufferedReader is a Java class that reads text from the input stream. It buffers the characters so that it can get the efficient reading of characters, arrays, etc. It inherits the reader class and makes the code efficient since we can read the data line-by-line with the readline() method.

What does OutputStreamWriter do in Java?

An OutputStreamWriter is a bridge from character streams to byte streams: Characters written to it are encoded into bytes using a specified charset . The charset that it uses may be specified by name or may be given explicitly, or the platform’s default charset may be accepted.

Which is better scanner or BufferedReader?

BufferedReader has significantly larger buffer memory than Scanner. … BufferedReader is a bit faster as compared to scanner because scanner does parsing of input data and BufferedReader simply reads sequence of characters.

What is the difference between FileReader and InputStreamReader?

FileReader reads character from a file in the file system. InputStreamReader reads characters from any kind of input stream. The stream cound be a FileInputStream, but could also be a stream obtained from a socket, an HTTP connection, a database blob, whatever.

What is readLine () in Java?

The readLine() method of Console class in Java is used to read a single line of text from the console. … Return value: This method returns the string containing the line that is read from the console. It returns null if the stream has ended. Exceptions: This method throws IOError if an I/O error occurs.

How InputStreamReader can be created?

Create an InputStreamReader

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InputStreamReader package first. Once we import the package here is how we can create the input stream reader. // Creates an InputStream FileInputStream file = new FileInputStream(String path); // Creates an InputStreamReader InputStreamReader input = new InputStreamReader(file);

How do I read a scanned file?

Create a File object representing your required file. Create a Scanner class by passing the above created file object. The hasNext() verifies whether the file has another line and the nextLine() method reads and returns the next line in the file. Using these methods read the contents of the file.

What is Bufferreader class in Java?

The BufferedReader class of Java is used to read the stream of characters from the specified source (character-input stream). … This class provides a method named read() and readLine() which reads and returns the character and next line from the source (respectively) and returns them.

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