The constructor InputStreamReader(File) is undefined

import java.io.*;

public class Streams {
    public static void main(String[] args) {
        File homedir = new File(System.getProperty("user.home"));
        File is = new File(homedir, "java/in.txt");
        BufferedReader br = new BufferedReader(new InputStreamReader(is));
        int value = 0;
        while ((value=br.read())!=-1) {
            char c = (char) value;
            System.out.println(c);
        }
    }
}

while compiling the above program i am getting error like this

ERROR in Streams.java (at line 7) BufferedReader br = new BufferedReader(new InputStreamReader(is)); ^^^^^^^^^^^^^^^^^^^^^^^^^

The constructor InputStreamReader(File) is undefined

kindly help me out this problem i am using java 1.7.0_51 version, OS linux Deepin

Thanks in advance

Jon Skeet
people
quotationmark

Yes, it's quite right. Look at the documentation for InputStreamReader and you won't find a constructor taking a File parameter.

Instead, you should construct a FileInputStream to read from the file, and pass that to the constructor of the InputStreamReader. You should also specify the encoding you want to use, otherwise it'll use the platform default encoding.

Also note:

  • You should use a try-with-resources statement to close the resource automatically
  • I wouldn't name a File variable is - that sounds more like you'd expect it to be an InputStream.

So for example:

File file = new File(homedir, "java/in.txt");
try (BufferedReader br = new BufferedReader(new InputStreamReader(
        new FileInputStream(file), StandardCharsets.UTF_8))) {
    int value = 0;
    while ((value = br.read()) != -1) {
        char c = (char) value;
        System.out.println(c);
    }
}

(Or use the Files API as per fge's answer.)

people

See more on this question at Stackoverflow