- Java.io package classes
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- Java.io - ObjectInputStream
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- io - ObjectOutputStream.PutField
- Java.io - ObjectStreamClass
- Java.io - ObjectStreamField
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- Java.io package extras
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- Java.io package Useful Resources
- Java.io - Discussion
Java.io.ObjectOutputStream useProtocolVersion() Method
Description
The java.io.ObjectOutputStream.useProtocolVersion(int version) method specifies stream protocol version to use when writing the stream.
This routine provides a hook to enable the current version of Serialization to write in a format that is backwards compatible to a previous version of the stream format.
Declaration
Following is the declaration for java.io.ObjectOutputStream.useProtocolVersion() method.
public void useProtocolVersion(int version)
Parameters
version − use ProtocolVersion from java.io.ObjectStreamConstants.
Return Value
This method does not return a value.
Exception
IllegalStateException − If called after any objects have been serialized.
IllegalArgumentException − If invalid version is passed in.
IOException − If I/O errors occur
Example
The following example shows the usage of java.io.ObjectOutputStream.useProtocolVersion() method.
package com.tutorialspoint; import java.io.*; public class ObjectOutputStreamDemo { public static void main(String[] args) { Object s = "Hello World!"; Object s2 = "Bye World!"; try { // create a new file with an ObjectOutputStream FileOutputStream out = new FileOutputStream("test.txt"); ObjectOutputStream oout = new ObjectOutputStream(out); // change protocol version oout.useProtocolVersion(ObjectStreamConstants.PROTOCOL_VERSION_1); // write something in the file oout.writeObject(s); oout.writeObject(s2); // close the stream oout.close(); // create an ObjectInputStream for the file we created before ObjectInputStream ois = new ObjectInputStream(new FileInputStream("test.txt")); // read and print a string System.out.println("" + (String) ois.readObject()); System.out.println("" + (String) ois.readObject()); } catch (Exception ex) { ex.printStackTrace(); } } }
Let us compile and run the above program, this will produce the following result −
Hello World! Bye World!