how to read file text to variable in java

public static void readAsString() {
    String lCurentDir = System.getProperty("user.dir")+"/test.txt";
    FileReader fr;
    
    try {
        fr = new FileReader(lCurentDir);
         BufferedReader br = new BufferedReader(fr);
            String s="";
            s=br.readLine();
            System.out.println(s);
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}