Download Java.io.ObjectOutputStream.enableReplaceObject

JAVA.IO.OBJECTOUTPUTSTREAM ENABLEREPLACEOBJECT METHOD
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Description
The java.io.ObjectOutputStream.enableReplaceObjectbooleanenable method enables the
stream to do replacement of objects in the stream. When enabled, the replaceObject method is
called for every object being serialized.
If enable is true, and there is a security manager installed, this method first calls the security
manager's checkPermission method with a SerializablePermission " enableSubstitution " permission to
ensure it's ok to enable the stream to do replacement of objects in the stream.
Declaration
Following is the declaration for java.io.ObjectOutputStream.enableReplaceObject method
protected boolean enableReplaceObject(boolean enable)
Parameters
enable -- boolean parameter to enable replacement of objects
Return Value
This method returns the previous setting before this method was invoked
Exception
SecurityException -- if a security manager exists and its checkPermission method denies
enabling the stream to do replacement of objects in the stream.
Example
The following example shows the usage of java.io.ObjectOutputStream.enableReplaceObject
method.
package com.tutorialspoint;
import java.io.*;
public class ObjectOutputStreamDemo extends ObjectOutputStream {
public ObjectOutputStreamDemo(OutputStream out) throws IOException {
super(out);
}
public static void main(String[] args) {
int i = 319874;
try {
// create a new file with an ObjectOutputStream
FileOutputStream out = new FileOutputStream("test.txt");
ObjectOutputStreamDemo oout = new ObjectOutputStreamDemo(out);
// enable replacing objects and return the previous setting
System.out.println("" + oout.enableReplaceObject(true));
// write something in the file
oout.writeInt(i);
oout.writeInt(1653984);
oout.flush();
// 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 an int
System.out.println("" + ois.readInt());
// read and print an int
System.out.println("" + ois.readInt());
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
Let us compile and run the above program, this will produce the following result:
319874
1653984
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