All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

ParcelFileDescriptor.AutoCloseInputStream
```
public class FileInputStream
extends InputStream
```
An input stream that reads bytes from a file.
```
   
   File file = ...
   InputStream in = null;
   try {
     in = new BufferedInputStream(new FileInputStream(file));
     ...
   } finally {
     if (in != null) {
       in.close();
     }
   }
 
```
This stream is not buffered. Most callers should wrap this stream with a BufferedInputStream.
Use FileReader to read characters, as opposed to bytes, from a file.
See Also:

BufferedInputStream, FileOutputStream

Constructor Summary

Constructors
Constructor	Description
`FileInputStream(File file)`	Constructs a new `FileInputStream` that reads from `file`.
`FileInputStream(FileDescriptor fd)`	Constructs a new `FileInputStream` that reads from `fd`.
`FileInputStream(String path)`	Equivalent to `new FileInputStream(new File(path))`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`available()`	Returns an estimated number of bytes that can be read or skipped without blocking for more input.
`void`	`close()`	Closes this stream.
`protected void`	`finalize()`	Ensures that all resources for this stream are released when it is about to be garbage collected.
`FileChannel`	`getChannel()`	Returns a read-only `FileChannel` that shares its position with this stream.
`FileDescriptor`	`getFD()`	Returns the underlying file descriptor.
`int`	`read()`	Reads a single byte from this stream and returns it as an integer in the range from 0 to 255.
`int`	`read(byte[] buffer, int byteOffset, int byteCount)`	Reads up to `byteCount` bytes from this stream and stores them in the byte array `buffer` starting at `byteOffset`.
`long`	`skip(long byteCount)`	Skips at most `byteCount` bytes in this stream.

Methods inherited from class java.io.InputStream
mark, markSupported, read, reset

Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - FileInputStream
```
public FileInputStream(File file)
                throws FileNotFoundException
```
    Constructs a new FileInputStream that reads from file.
    
    Parameters:
    
    file - the file from which this stream reads.
    
    Throws:
    
    FileNotFoundException - if file does not exist.
  - FileInputStream
```
public FileInputStream(FileDescriptor fd)
```
    Constructs a new FileInputStream that reads from fd.
    
    Parameters:
    
    fd - the FileDescriptor from which this stream reads.
    
    Throws:
    
    NullPointerException - if fd is null.
  - FileInputStream
```
public FileInputStream(String path)
                throws FileNotFoundException
```
    Equivalent to new FileInputStream(new File(path)).
    
    Throws:
    
    FileNotFoundException
- Method Detail
  - available
```
public int available()
              throws IOException
```
    Description copied from class: InputStream
    
    Returns an estimated number of bytes that can be read or skipped without blocking for more input.
    Note that this method provides such a weak guarantee that it is not very useful in practice.
    Firstly, the guarantee is "without blocking for more input" rather than "without blocking": a read may still block waiting for I/O to complete — the guarantee is merely that it won't have to wait indefinitely for data to be written. The result of this method should not be used as a license to do I/O on a thread that shouldn't be blocked.
    Secondly, the result is a conservative estimate and may be significantly smaller than the actual number of bytes available. In particular, an implementation that always returns 0 would be correct. In general, callers should only use this method if they'd be satisfied with treating the result as a boolean yes or no answer to the question "is there definitely data ready?".
    Thirdly, the fact that a given number of bytes is "available" does not guarantee that a read or skip will actually read or skip that many bytes: they may read or skip fewer.
    It is particularly important to realize that you must not use this method to size a container and assume that you can read the entirety of the stream without needing to resize the container. Such callers should probably write everything they read to a ByteArrayOutputStream and convert that to a byte array. Alternatively, if you're reading from a file, File.length() returns the current length of the file (though assuming the file's length can't change may be incorrect, reading a file is inherently racy).
    The default implementation of this method in InputStream always returns 0. Subclasses should override this method if they are able to indicate the number of bytes available.
    
    Overrides:
    
    available in class InputStream
    
    Returns:
    
    the estimated number of bytes available
    
    Throws:
    
    IOException - if this stream is closed or an error occurs
  - close
```
public void close()
           throws IOException
```
    Description copied from class: InputStream
    
    Closes this stream. Concrete implementations of this class should free any resources during close. This implementation does nothing.
    
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in interface Closeable
    
    Overrides:
    
    close in class InputStream
    
    Throws:
    
    IOException - if an error occurs while closing this stream.
  - finalize
```
protected void finalize()
                 throws IOException
```
    Ensures that all resources for this stream are released when it is about to be garbage collected.
    
    Overrides:
    
    finalize in class Object
    
    Throws:
    
    IOException - if an error occurs attempting to finalize this stream.
  - getChannel
```
public FileChannel getChannel()
```
    Returns a read-only FileChannel that shares its position with this stream.
  - getFD
```
public final FileDescriptor getFD()
                           throws IOException
```
    Returns the underlying file descriptor.
    
    Throws:
    
    IOException
  - read
```
public int read()
         throws IOException
```
    Description copied from class: InputStream
    
    Reads a single byte from this stream and returns it as an integer in the range from 0 to 255. Returns -1 if the end of the stream has been reached. Blocks until one byte has been read, the end of the source stream is detected or an exception is thrown.
    
    Specified by:
    
    read in class InputStream
    
    Throws:
    
    IOException - if the stream is closed or another IOException occurs.
  - read
```
public int read(byte[] buffer,
                int byteOffset,
                int byteCount)
         throws IOException
```
    Description copied from class: InputStream
    
    Reads up to byteCount bytes from this stream and stores them in the byte array buffer starting at byteOffset. Returns the number of bytes actually read or -1 if the end of the stream has been reached.
    
    Overrides:
    
    read in class InputStream
    
    Throws:
    
    IOException - if the stream is closed or another IOException occurs.
  - skip
```
public long skip(long byteCount)
          throws IOException
```
    Description copied from class: InputStream
    
    Skips at most byteCount bytes in this stream. The number of actual bytes skipped may be anywhere between 0 and byteCount. If byteCount is negative, this method does nothing and returns 0, but some subclasses may throw.
    Note the "at most" in the description of this method: this method may choose to skip fewer bytes than requested. Callers should always check the return value.
    This default implementation reads bytes into a temporary buffer. Concrete subclasses should provide their own implementation.
    
    Overrides:
    
    skip in class InputStream
    
    Returns:
    
    the number of bytes actually skipped.
    
    Throws:
    
    IOException - if this stream is closed or another IOException occurs.

Class FileInputStream

Constructor Summary

Method Summary

Methods inherited from class java.io.InputStream

Methods inherited from class java.lang.Object

Constructor Detail

FileInputStream

FileInputStream

FileInputStream

Method Detail

available

close

finalize

getChannel

getFD

read

read

skip