Use java's FileReader.read() function to read characters in the file

Use Java's FileReader.read() function to read characters in a file

In Java, we can use the FileReader class to read characters in a file. The FileReader class is part of the Java I/O library and provides the function of reading character files. The read() function is a method in the FileReader class, which can be used to read characters in character files.

The following sample code demonstrates how to use the FileReader.read() function to read characters in a file:

import java.io.FileReader;
import java.io.IOException;

public class FileReaderExample {
    public static void main(String[] args) {
        try {
            FileReader reader = new FileReader("file.txt");
            int character;
            while ((character = reader.read()) != -1) {
                System.out.print((char) character);
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

In the above code, a FileReader object is first created, and its parameters is the path to the file to be read. Then use a while loop to read the characters in the file until the end of the file is read (the read() function returns -1). In the loop, we convert the read characters into char type and print them out using the System.out.print() function.

It should be noted that when using FileReader, an IOException may be thrown, so we need to add a try-catch statement to the code to handle the exception.

In addition to using the read() function to read characters one by one, the FileReader class also provides other methods, such as read(char[] cbuf), which can read multiple characters into a character array at one time. These methods can be selected and used based on the specific needs of the document.

The above is an example of using Java's FileReader.read() function to read characters in a file. Through this example, we can learn how to use the FileReader class to read character files, and process them accordingly according to actual needs. Hope this article is helpful to you!

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