The Java FileOutputStream is a type of output stream that is utilized for the purpose of writing data to a file.
When you need to save primitive values to a file, the FileOutputStream class is the way to go. This class supports writing both byte-oriented and character-oriented data. However, when dealing specifically with character-oriented data, it's recommended to opt for FileWriter over FileOutputStream.
FileOutputStream class declaration
Let's examine the declaration of the Java.io.FileOutputStream class:
Example
public class FileOutputStream extends OutputStream
FileOutputStream class methods
| Method | Description |
|---|---|
| protected void finalize() | It is used to clean up the connection with the file output stream. |
| void write(byte[] ary) | It is used to writeary.lengthbytes from the bytearrayto the file output stream. |
| void write(byte[] ary, int off, int len) | It is used to writelenbytes from the byte array starting at offsetoffto the file output stream. |
| void write(int b) | It is used to write the specified byte to the file output stream. |
| FileChannel getChannel() | It is used to return the file channel object associated with the file output stream. |
| FileDescriptor getFD() | It is used to return the file descriptor associated with the stream. |
| void close() | It is used to closes the file output stream. |
Java FileOutputStream Example 1: write byte
Example
import java.io.FileOutputStream;
public class FileOutputStreamExample {
public static void main(String args[]){
try{
FileOutputStream fout=new FileOutputStream("D:\\testout.txt");
fout.write(65);
fout.close();
System.out.println("success...");
}catch(Exception e){System.out.println(e);}
}
}
Output:
Output
Success...
The information stored in the file named testout.txt is configured with the value A.
testout.txt
Java FileOutputStream example 2: write string
Example
import java.io.FileOutputStream;
public class FileOutputStreamExample {
public static void main(String args[]){
try{
FileOutputStream fout=new FileOutputStream("D:\\testout.txt");
String s="Welcome to Java.";
byte b[]=s.getBytes();//converting string into byte array
fout.write(b);
fout.close();
System.out.println("success...");
}catch(Exception e){System.out.println(e);}
}
}
Output:
Output
Success...
The data stored in the text file named testout.txt has been assigned the content "Welcome to Java".
testout.txt
Example
Welcome to Java.
