Java FileReader Class read() Method with Examples
The read() method of FileReader class in Java is used to read and return a single character in the form of an integer value that contains the character’s char value. The character read as an integer in the range of 0 to 65535 is returned by this function. If it returns -1 as an int number, it means that all of the data has been read and that FileReader may be closed.
Syntax:
public abstract int read()
Returns: The read() method returns a single character in the form of an integer value that contains the character’s char value. It returns -1 when all of the data has been read and that FileReader may be closed.
Example 1: We are calling the read() method of FileReader class to read the data from the file, this method reads the one character at a time and returns its ASCII value in the integer format. To print the actual data we must typecast it to the char.
- Java
Java
// Java Program to demonstrate the use of read() // method of FileReader class in Java import java.io.FileReader; public class GFG { public static void main(String args[]) { try { FileReader fileReader = new FileReader( "C:\\Users\\lenovo\\Desktop\\input.txt"); char c = (char)fileReader.read(); System.out.print(c); fileReader.close(); } catch (Exception e) { System.out.println("Error: " + e.toString()); } } } |
The input.txt file has the following content:
Output:
Example 2:
- Java
Java
// Java Program to demonstrate the use of read() // method of FileReader class in Java import java.io.FileReader; public class GFG { public static void main(String args[]) { try { FileReader fileReader = new FileReader( "C:\\Users\\lenovo\\Desktop\\input.txt"); int i; while ((i = fileReader.read()) != -1) System.out.print((char)i); fileReader.close(); } catch (Exception e) { System.out.println("Error: " + e.toString()); } } } |
After creating a FileReader, we read each character and report it to the console using the read() function.
Output:
