basic Reader and Builder JAVA

basic Reader and Builder.java

InputStreamReader..............................................................................
  - InputStream: class that reads binary data in the form of bytes from a source.
  - InputStreamReader:  It reads bytes using the given InputStream and then converts them into chars
			based on a certain Charset (UTF-8, UTF-16).
  - has a read() method that reads a single character (bytes --> characters)

remember:
	InputStreamReader.read() != InputStream.read()

1. InputStreamReader reader = new InputStreamReader(new FileInputStream(filePath), StandardCharsets.UTF_8)


BufferedReader................................................................................
	- a class which simplifies reading text from a character input stream. 
	- It buffers the characters in order to enable efficient reading of text data.
	- buffer size of 8KB.
	-  it enables us to minimize the number of I/O operations by reading chunks of characters 
	   and storing them in an internal buffer.

1. BufferedReader reader = new BufferedReader(<stream>)
2. BufferedReader reader = new BufferedReader(new InputStreamReader(System.in))
3. BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()))
4. BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath))
5. BufferedReader reader = new BufferedReader(new FileReader(filePath));

reader.readLine();
reader.close();

reader.available();
reader.read(bytes);


StringBuilder...........................................................
StringBuilder sb = new StringBuilder();
sb.append(inputLine);
response = sb.toString();