Java FileReader Class read() Method with Examples - Coding

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 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 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:

Reffered: https://www.geeksforgeeks.org

Java

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