Introduction
Java.io FileReader is the class used for reading content of files in characters. Java.io FileReader having the feature to read streams of characters into the file or directory. Whereas for the purpose of reading bytes of stream, FileInputStream is used.
The default character encoding scheme is only possible in case of Java.io FileReader. To specify a different character encoding scheme then use InputStreamReader.
Conceptual
figure
Declaration
Java.io.FileReader class is declared as shown below:
Public class FileReader extends InputStreamReader
Fields
Java.io FileReader class fields are as follows:
- Protected Object lock : For synchronize operations this object is used in FileReader.
Table
| Constructor | Description |
|---|---|
| FileReader(File file) | The function of this constructor is to construct the file reader object and reads the given file. |
| FileReader(FileDescriptor file) | The function of this constructor is to construct the file reader object and reads the given file descriptor. |
| FileReader(String fileName) | This constructor creates a new FileReader and given the name of the file to read from.The function of this constructor is to construct the file reader object and reads the given file name. |
Description
From the following classes methods are inherited to Java.io.FileReader are:
- Java.io.InputStreamReader
- java.uti.Reader
- Java.io.Object
Example
FileRead.java
[java]import java.io.*;
public class FileRead {
public static void main(String args[])throws IOException {
File file = new File("Hello1.txt");
// creates the file
file.createNewFile();
// creates a FileWriter Object
FileWriter writer = new FileWriter(file);
// Writes the content to the file
writer.write("Splessons\nThis\n is\n an\n example\n");
writer.flush();
writer.close();
// Creates a FileReader Object
FileReader fr = new FileReader(file);
char [] a = new char[50];
fr.read(a); // reads the content to the array
for(char c : a)
System.out.print(c); // prints the characters one by one
fr.close();
}
}[/java]
Output
The result will be as follows.
[java]Splessons
This
is
an
example[/java]
Key Points
- Java.io FileReader is the class used for reading content of files in characters.
- FileReader having the feature to read streams of characters into the file or directory.
- The default character encoding scheme is only possible in case of FileReader. To specify a different character encoding scheme then use InputStreamReader.