Hello Everyone,
Everything in Java is associated with classes and objects, along with its attributes and methods. For example: in real life, a car is an object. The car has attributes, such as weight and color, and methods, such as drive and brake.
A Class is like an object constructor, or a “blueprint” for creating objects.
Create a Class
To create a class, use the keyword class:
Main.java
Create a class named “Main” with a variable x:
public class Main {
int x = 5;
}
Now, Java.io.OutputStream class is the superclass of all classes representing an output stream of bytes. An output stream accepts output bytes and sends them to some sink.
Applications that need to define a subclass of OutputStream must always provide at least a method that writes one byte of output.
Constructor and Description
- OutputStream() : Single Constructor
Methods:
- void close() : Closes this output stream and releases any system resources associated with this stream.
**Syntax :**public void close() throws IOException Throws: IOException
- void flush() : Flushes this output stream and forces any buffered output bytes to be written out.
**Syntax :**public void flush() throws IOException Throws: IOException
- void write(byte[] b) : Writes b.length bytes from the specified byte array to this output stream.
**Syntax :**public void write(byte[] b) throws IOException Parameters: b - the data. Throws: IOException
- void write(byte[] b, int off, int len) : Writes len bytes from the specified byte array starting at offset off to this output stream.
**Syntax :**public void write(byte[] b, int off, int len) throws IOException Parameters: b - the data. off - the start offset in the data. len - the number of bytes to write. Throws: IOException
- abstract void write(int b) : Writes the specified byte to this output stream.
**Syntax :**public abstract void write(int b) throws IOException Parameters: b - the byte. Throws: IOException
import java.io.*;
//Java program to demonstrate OutputStream
class OutputStreamDemo
{
public static void main(String args[]) throws Exception
{
OutputStream os = new FileOutputStream( "file.txt" );
byte b[] = { 65 , 66 , 67 , 68 , 69 , 70 };
//illustrating write(byte[] b) method
os.write(b);
//illustrating flush() method
os.flush();
//illustrating write(int b) method
for ( int i = 71 ; i < 75 ; i++)
{
os.write(i);
}
os.flush();
//close the stream
os.close();
}
}
Output :
ABCDEFGHIJ