See more
What is the use of FileInputStream and FileOutputStream in Java?
Java provides I/O Streams to read and write data where, a Stream represents an input source or an output destination which could be a file, i/o devise, other program etc. InputStream − This is used to read (sequential) data from a source. OutputStream − This is used to write data to a destination.
What is FileInputStream read in Java?
The java. io. FileInputStream. read() reads a byte of data from this input stream. The method blocks if no input is available.
How do I read a file with FileInputStream?
How to read data from a file using FileInputStream?int read() − This simply reads data from the current InputStream and returns the read data byte by byte (in integer format). ... int read(byte[] b) − This method accepts a byte array as parameter and reads the contents of the current InputStream, to the given array.More items...•
What is difference between file and FileInputStream?
FileInputStream is Byte Based, it can be used to read bytes. FileReader is Character Based, it can be used to read characters. FileInputStream is used for reading binary files. FileReader is used for reading text files in platform default encoding.
Is it necessary to close FileInputStream?
Yes, you need to close the inputstream if you want your system resources released back. FileInputStream. close() is what you need.
When should I close FileInputStream?
An FileInputStream and a BufferedInputStream . Both of these resources will be closed automatically when execution leaves the try block.
What is FileInputStream in selenium?
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 .
How do I use a file reader?
Create a FileReaderUsing the name of the file. FileReader input = new FileReader(String name); Here, we have created a file reader that will be linked to the file specified by the name .Using an object of the file. FileReader input = new FileReader(File fileObj);
What is a stream in Java?
A stream is a sequence of objects that supports various methods which can be pipelined to produce the desired result. The features of Java stream are – A stream is not a data structure instead it takes input from the Collections, Arrays or I/O channels.
What is the difference between FileInputStream and ByteArrayInputStream?
The InputStream is an abstract class and ByteArrayInputStream is a concrete class of InputStream and offers its own implementation of the abstract idea given by (InputStream), In Addition : A ByteArrayInputStream contains an internal buffer that contains bytes that may be read from the stream.
What are the differences between FileInputStream FileReader and BufferedReader?
Bottom line is use FileReader or BufferedReader to read stream of characters or text data from File and always specify character encoding. Use FileInputStream to read raw streams of bytes from file or socket in Java.
Which is used for writing data to a file in file handling FileInputStream?
Java FileWriter and FileReader classes are used to write and read data from text files (they are Character Stream classes).
Which exception is thrown by read () method?
IOExceptionWhich exception is thrown by read() method? Explanation: read method throws IOException.
What is FileInputStream in selenium?
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 happens when the constructor for FileInputStream fails to open a file for reading?
FileInputStream class declares that it throws a FileNotFoundException , and it states in its javadoc: If the named file does not exist, is a directory rather than a regular file, or for some other reason cannot be opened for reading then a FileNotFoundException is thrown.
How do I use a file reader?
Create a FileReaderUsing the name of the file. FileReader input = new FileReader(String name); Here, we have created a file reader that will be linked to the file specified by the name .Using an object of the file. FileReader input = new FileReader(File fileObj);
How to close a file input stream?
To close the file input stream, we can use the close () method. Once the close () method is called, we cannot use the input stream to read data.
What is input stream after skipping 5 bytes?
Input Stream after skipping 5 bytes: is a line of text inside the file.
What is data in a file?
Data in the file: This is a line of text inside the file.
What is a file input stream?
Java FileInputStream is a class that is used to read data and the streams of bytes from the file. The FileInputStream class is a built-in class in java that defines the java.io.FileInputStream package. The InputStream is a superclass of the FileInputStream. The FileInputStream class is used to reads the streams of raw bytes (byte by byte) like an image data video, audio, etc., whereas to read streams of characters (character by character), we can use FileReaderbuiltin class.
What is the function of the bytes function?
This function is used to return the estimated number of bytes that can be read from the input stream.
What is input stream?
InputStream − This is used to read (sequential) data from a source.
What is an I/O stream in Java?
Java provides I/O Streams to read and write data where, a Stream represents an input source or an output destination which could be a file, i/o devise, other program etc.
What is int write?
int write (byte [] b, int off, int len) − This method accepts a byte array, its offset (int) and, its length (int) as parameters and writes its contents to the current OutputStream.
What is a file descriptor?
This writes data into a specific file or, file descriptor (byte by byte). It is usually used to write the contents of a file with raw bytes, such as images.
Commonly used constructors of FileInputStream
Creates a FileInputStream by opening a connection to an actual file, the file named by the File object file in the file system.
Example
import java.io.FileInputStream; /** * This program is used to read a file using FileInputStream. * @author w3spoint */ class IOTest { public void readFile (){ try { //creating FileInputStream object. FileInputStream fis = new FileInputStream("F:\\New folder\\data1.txt"); int i; //read file. while(( i = fis. read())!=-1){ System. out.
FileOutputStream
FileOutputStream is used to create a file and write data into it. It will create a file, if it does not exist.
Commonly used constructors of FileOutputStream
Creates a file output stream to write to the file represented by the specified File object.
Example
import java.io.FileOutputStream; /** * This program is used to write data into * a file using FileOutputStream. * @author w3spoint */ class IOTest { String str = "Hello www.w3spoint.com"; public void writeFile (){ try { //Creating FileOutputStream object. //It will create a new file before writing if not exist.
Example: Reading the data from one file and writing it into another file
import java.io.FileInputStream; import java.io.FileOutputStream; /** * This program is used to read a file and write into another file. * @author w3spoint */ class IOTest { public void readFile (){ try { //Creating FileInputStream object. FileInputStream fis = new FileInputStream("F:\\New folder\\data1.txt"); //Creating FileOutputStream object.
What is FileInputStreamextends?
FileInputStreamextends InputStream: it is a specialized version of an InputStream designed for reading files.
Can you call operations in inputstream?
However, what no one mentioned so far is: You can only call operations that are declared in InputStreamon that variable. If FileInputStreamwould offer some additional operations, the compiler would throw an error if you try to call it. In this case you would need to use FileInputStreamas type of the variable.
Should you program against FileInputStream?
However, if there is even the slightest hint of leaking FileInputStream specific behavior through your class' interface, without this being essential to the problem you are trying to solve, you should always program against the more basic type.