- Java.io package classes
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- Java.io - BufferedInputStream
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- Java.io - FileInputStream
- Java.io - FileOutputStream
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- Java.io - FilterOutputStream
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- 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.ObjectOutputStream defaultWriteObject() Method
Description
The java.io.ObjectOutputStream.defaultWriteObject() method writes the non-static and non-transient fields of the current class to this stream. This may only be called from the writeObject method of the class being serialized. It will throw the NotActiveException if it is called otherwise.
Declaration
Following is the declaration for java.io.ObjectOutputStream.defaultWriteObject() method.
public void defaultWriteObject()
Parameters
NA
Return Value
This method does not return a value.
Exception
IOException − If I/O errors occur while writing to the underlying OutputStream.
Example
The following example shows the usage of java.io.ObjectOutputStream.defaultWriteObject() method.
package com.tutorialspoint; import java.io.*; public class ObjectOutputStreamDemo { public static void main(String[] args) { int i = 319874; try { // create a new file with an ObjectOutputStream FileOutputStream out = new FileOutputStream("test.txt"); ObjectOutputStream oout = new ObjectOutputStream(out); // 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(); } } static class Example implements Serializable { String s = "Hello World!"; private void writeObject(ObjectOutputStream out) throws IOException, ClassNotFoundException { out.defaultWriteObject(); } } }
Let us compile and run the above program, this will produce the following result −
319874 1653984
java_io_objectoutputstream.htm
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