fileInputStream.read

The `read()` method in `FileInputStream` class is used to read a byte of data from the input stream. It returns the next byte of data, or -1 if the end of the file is reached.

Syntax:

public int read() throws IOException

Example usage:

FileInputStream fis = new FileInputStream("input.txt");
int data = fis.read();
while(data != -1) {
    System.out.print((char)data);
    data = fis.read();
}
fis.close();

In this example, the `FileInputStream` reads from a file named "input.txt". The `read()` method is used inside a loop to read each byte of data from the file and print it as a character. The loop continues until the end of the file is reached (`read()` returns -1), at which point the file input stream is closed.