Frequent question: What is difference between FileInputStream and ObjectInputStream in Java?

What is difference between FileOutputStream and ObjectOutputStream?

ObjectOutputStream is used to serialize objects. A FileOutputStream is a way to write to a file.

What is FileInputStream in Java?

A FileInputStream obtains input bytes from a file in a file system. What files are available depends on the host environment. FileInputStream is meant for reading streams of raw bytes such as image data. For reading streams of characters, consider using FileReader .

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.

What is the difference between file and FileInputStream in Java?

It returns data in byte format like FileInputStream class. It is a character-oriented class that is used for file handling in java.


FileInputStream FileReader
Stream is a byte-based object that can read and write bytes. Reader is Character Based, it can be used to read or write characters.
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What is Java 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. … Any object, including Strings and arrays, is written with writeObject.

Do we need to close FileInputStream in Java?

Yes, you need to close the inputstream if you want your system resources released back. FileInputStream. close() is what you need.

Why InputStreamReader is used in Java?

The InputStreamReader class of the package can be used to convert data in bytes into data in characters. It extends the abstract class Reader . … It is also known as a bridge between byte streams and character streams. This is because the InputStreamReader reads bytes from the input stream as characters.

What is Ifstream in Java?

The FileInputStream class connects an input stream to an input file. You won’t often use this class to read directly from an input file. Instead, you’ll use it with other classes such as BufferedInputStream and DataInputStream . The FileInputStream class is one of many Java I/O classes that use streams.

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.

What is the use of ObjectInputStream?

ObjectInputStream is used to recover those objects previously serialized. Other uses include passing objects between hosts using a socket stream or for marshaling and unmarshaling arguments and parameters in a remote communication system.

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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 file in Java?

In Java, a File is an abstract data type. A named location used to store related information is known as a File. There are several File Operations like creating a new File, getting information about File, writing into a File, reading from a File and deleting a File.

What can be used instead of FileInputStream?

There are several implementations of an InputStream according to the use of it. It is usually good practice to use the highest type needed in your code. Therefore if your code needs to read data from an InputStream but not specifically from a FileInputStream , you should use InputStream .

What is InputStream class in Java?

InputStream class is the superclass of all classes representing an input stream of bytes. Applications that need to define a subclass of InputStream must always provide a method that returns the next byte of input.