How to create a file in a directory in java?

Question

The best way to do it is:

String path = "C:" + File.separator + "hello" + File.separator + "hi.txt";
// Use relative path for Unix systems
File f = new File(path);

f.getParentFile().mkdirs(); 
f.createNewFile();

You need to ensure that the parent directories exist before writing. You can do this by File#mkdirs().

File f = new File("C:/a/b/test.txt");
f.getParentFile().mkdirs();
// ...

With Java 7, you can use Path, Paths, and Files:

import java.io.IOException;
import java.nio.file.FileAlreadyExistsException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class CreateFile {

    public static void main(String[] args) throws IOException {
        Path path = Paths.get("/tmp/foo/bar.txt");

        Files.createDirectories(path.getParent());

        try {
            Files.createFile(path);
        } catch (FileAlreadyExistsException e) {
            System.err.println("already exists: " + e.getMessage());
        }
    }
}

Use:

File f = new File("C:\\a\\b\\test.txt");
f.mkdirs();
f.createNewFile();

Notice I changed the forward slashes to double back slashes for paths in Windows File System. This will create an empty file on the given path.

String path = "C:"+File.separator+"hello";
String fname= path+File.separator+"abc.txt";
    File f = new File(path);
    File f1 = new File(fname);

    f.mkdirs() ;
    try {
        f1.createNewFile();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

This should create a new file inside a directory