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File file = new File ("test.txt");
try {
    file.createNewFile();
} catch (IOException e) {
    e.printStackTrace();
}

try(BufferedWriter out = new BufferedWriter(new
        FileWriter(file))) {

    out.write("Тест");
}
catch (IOException e){
    e.printStackTrace();
}


try(BufferedReader in = new BufferedReader(new
        FileReader(file))) {

    String s = in.readLine();
    System.out.println(s);
}
catch (IOException e){
    e.printStackTrace();
}