FileReader

We can use FileReader to Read Character Data from the file.

Constructors :

FileReader fr = new FileReader(String fileName);
FileReader fr = new FileReader(File fileReference);

Note : If the file does not exist then, FileReader will throw java.io.FileNotFoundException

Methods :

int read(); //returns unicode value of character
int read(char[] ch); //returns number of characters copied from file to array
void close();

Example of : int read() method

package com.fileDemo;

import java.io.File;
import java.io.FileReader;

public class Demo {
	public static void main(String[] args) throws Exception {
		File f = new File("/home/tyson/Desktop/temp/file1"); //throws exception if file is not present
		FileReader fr = new FileReader(f);
		int x = fr.read();
		while(x!=-1) {
			System.out.print((char)x); //need to type cast to convert unicode to its character value 
			x = fr.read();
		}
                fr.close();
	}
}

Example of : int read(char []) method

package com.fileDemo;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;

public class Demo {
	public static void main(String[] args) throws IOException {
		File f = new File("/home/tyson/Desktop/temp/file1");
		char[] ch = new char[(int)f.length()];
		FileReader fr =	new FileReader(f);
		fr.read(ch);
		for(char c : ch) {
			System.out.print(c);
		}
		fr.close();
	}
}

Note : Line by line reading is not possible in FileReader hence the concept of BufferedReader.