| . Is part of the java.io package |
| . Is an extension of the InputStream class, an abstract class that describes the behavior of an input stream |
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| . Is a low-level class that can be used to read individual, 8-bit bytes from a stream |
| . Has several constructors. The most frequently used constructs a FileInputStream object from a File object that encapsulates the file's pathname. For example, if fd is the reference of a File object |
| FileInputStream in = new FileInputStream(fd); |
| It will construct a FileInputStream object for reading bytes from the file. Because a checked, IOException may occur, the statement should be enclosed in a try block with an appropriate catch. |
| . it has a few useful methods. The most used are: |
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| Because a checked, IOException may occur, calls to these methods should be enclosed in a try block with an appropriate catch. Consult the Java API documentation for more details. |
| . Example. The following program can be used to read byte values from a disk file. It can be used to display the values stored by the previous sample program. |
| import java.io.*; public class AppFIS { public static void main(String[] args) { // Local variables and object references. File fd; FileInputStream in; // Get the path name from the user. System.out.print("Enter the file's complete path name: "); fd = new File(Keyboard.readString()); // Try to read data from the input stream. try { // Open an input stream for the file. in = new FileInputStream(fd); // This loop reads a byte from the stream and displays // its value. The loop ends when no more bytes are available. while (in.available() > 0) { System.out.println(in.read()); } // Close the stream. in.close(); System.out.println("Closed - " + fd.getPath()); } // Catch an IOException if one is thrown. catch (IOException e) { System.out.println(e.getMessage()); } } } |
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