What is ObjectInputStream in Java?

What is the use of ObjectInputStream in Java?

An ObjectInputStream deserializes primitive data and objects previously written using an ObjectOutputStream. ObjectOutputStream and ObjectInputStream can provide an application with persistent storage for graphs of objects when used with a FileOutputStream and FileInputStream respectively.

What is ObjectInputStream and ObjectOutputStream in Java?

The ObjectOutputStream is used to write the Java objects, and the ObjectInputStream is used to read the objects again.

What is ObjectInputStream readObject in Java?

readObject() reads an object from the serialized class. This method is used to call the defaultReadObject. If the class is deserialized by default, then it can be overridden using the readObject and writeObject methods.

How do you read ObjectInputStream?

Java. io. ObjectInputStream. read() Method

  1. Description. The java. …
  2. Declaration. Following is the declaration for java. …
  3. Parameters. NA.
  4. Return Value. This method returns the byte read, or -1 if the end of the stream is reached.
  5. Exception. IOException − If an I/O error has occurred.
  6. Example.

What is Randomaccessfile in Java?

This class is used for reading and writing to random access file. A random access file behaves like a large array of bytes. If end-of-file is reached before the desired number of byte has been read than EOFException is thrown. … It is a type of IOException.

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What is the use of ObjectOutputStream?

An ObjectOutputStream writes primitive data types and graphs of Java objects to an OutputStream. The objects can be read (reconstituted) using an ObjectInputStream. Persistent storage of objects can be accomplished by using a file for the stream.

What is isDirectory in Java?

The isDirectory() function is a part of File class in Java . This function determines whether the is a file or directory denoted by the abstract filename is Directory or not. The function returns true if the abstract file path is Directory else returns false.

What is readResolve method in Java?

The readResolve method is called when ObjectInputStream has read an object from the stream and is preparing to return it to the caller. … If the method is defined, the readResolve method is called to allow the object in the stream to designate the object to be returned.

What is the use of FileOutputStream in Java?

Java FileOutputStream is an output stream used for writing data to a file. If you have to write primitive values into a file, use FileOutputStream class. You can write byte-oriented as well as character-oriented data through FileOutputStream class.

Can we serialize static variables?

A static variable cannot be serialized. While de-serializing a value can be available for Static variables if the same is provided while initialization of the base class. It doesn’t mean that static variable will be serialized.

What is piped stream in java?

The piped input stream contains a buffer, decoupling read operations from write operations, within limits. A pipe is said to be broken if a thread that was providing data bytes to the connected piped output stream is no longer alive.

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What causes java EOFException?

EOFException. Signals that an end of file or end of stream has been reached unexpectedly during input. This exception is mainly used by data input streams, which generally expect a binary file in a specific format, and for which an end of stream is an unusual condition.

What is a buffered input stream?

A BufferedInputStream adds functionality to another input stream-namely, the ability to buffer the input and to support the mark and reset methods. … As bytes from the stream are read or skipped, the internal buffer is refilled as necessary from the contained input stream, many bytes at a time.