- Java.io package classes
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- Java.io - BufferedInputStream
- Java.io - BufferedOutputStream
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- Java.io - DataOutputStream
- Java.io - File
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- Java.io - FileInputStream
- Java.io - FileOutputStream
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- Java.io - FilterOutputStream
- Java.io - FilterReader
- Java.io - FilterWriter
- Java.io - InputStream
- Java.io - InputStreamReader
- Java.io - LineNumberInputStream
- Java.io - LineNumberReader
- Java.io - ObjectInputStream
- Java.io - ObjectInputStream.GetField
- Java.io - ObjectOutputStream
- io - ObjectOutputStream.PutField
- Java.io - ObjectStreamClass
- Java.io - ObjectStreamField
- Java.io - OutputStream
- Java.io - OutputStreamWriter
- Java.io - PipedInputStream
- Java.io - PipedOutputStream
- Java.io - PipedReader
- Java.io - PipedWriter
- Java.io - PrintStream
- Java.io - PrintWriter
- Java.io - PushbackInputStream
- Java.io - PushbackReader
- Java.io - RandomAccessFile
- Java.io - Reader
- Java.io - SequenceInputStream
- Java.io - SerializablePermission
- Java.io - StreamTokenizer
- Java.io - StringBufferInputStream
- Java.io - StringReader
- Java.io - StringWriter
- Java.io - Writer
- Java.io package extras
- Java.io - Interfaces
- Java.io - Exceptions
- Java.io package Useful Resources
- Java.io - Discussion
Java.io.OutputStream.write() Method
Description
The java.io.OutputStream.write(byte[] b, int off, int len) method writes len bytes from the specified byte array starting at offset off to this output stream. The general contract for write(b, off, len) is that some of the bytes in the array b are written to the output stream in order; element b[off] is the first byte written and b[off+len-1] is the last byte written by this operation.
The write method of OutputStream calls the write method of one argument on each of the bytes to be written out. Subclasses are encouraged to override this method and provide a more efficient implementation.
If b is null, a NullPointerException is thrown. If off is negative, or len is negative, or off+len is greater than the length of the array b, then an IndexOutOfBoundsException is thrown.
Declaration
Following is the declaration for java.io.OutputStream.write() method.
public void write(byte[] b, int off, int len)
Parameters
b − The data.
off − The start offset in the data.
len − The number of bytes to write.
Return Value
This method does not return a value.
Exception
IOException − If an I/O error occurs. In particular, an IOException is thrown if the output stream is closed.
Example
The following example shows the usage of java.io.OutputStream.write() method.
package com.tutorialspoint; import java.io.*; public class OutputStreamDemo { public static void main(String[] args) { byte[] b = {'h', 'e', 'l', 'l', 'o'}; try { // create a new output stream OutputStream os = new FileOutputStream("test.txt"); // craete a new input stream InputStream is = new FileInputStream("test.txt"); // write something os.write(b, 0, 3); // read what we wrote for (int i = 0; i < 3; i++) { System.out.print("" + (char) is.read()); } } catch (Exception ex) { ex.printStackTrace(); } } }
Let us compile and run the above program, this will produce the following result −
hel