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    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        writeToFile("test.txt", "abcdefg");
        String str = readFromFile("test.txt");
        setTitle(str);
    }
 
    private String readFromFile(String FILENAME) {
        try{
            FileInputStream fin = openFileInput(FILENAME);
            byte[] buff = new byte[fin.available()];
            fin.read(buff);
            String str = new String(buff);
            return str;
        }catch (Exception e){
            return null;
        }
    }
 
    private void writeToFile(String FILENAME, String string) {
        try {
            FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
            fos.write(string.getBytes());
            fos.close();
        }catch (Exception e){
        }
    }
 

Main.java:1: error: class, interface, or enum expected
    protected void onCreate(Bundle savedInstanceState) {
              ^
Main.java:3: error: class, interface, or enum expected
        setContentView(R.layout.activity_main);
        ^
Main.java:4: error: class, interface, or enum expected
        writeToFile("test.txt", "abcdefg");
        ^
Main.java:5: error: class, interface, or enum expected
        String str = readFromFile("test.txt");
        ^
Main.java:6: error: class, interface, or enum expected
        setTitle(str);
        ^
Main.java:7: error: class, interface, or enum expected
    }
    ^
Main.java:12: error: class, interface, or enum expected
            byte[] buff = new byte[fin.available()];
            ^
Main.java:13: error: class, interface, or enum expected
            fin.read(buff);
            ^
Main.java:14: error: class, interface, or enum expected
            String str = new String(buff);
            ^
Main.java:15: error: class, interface, or enum expected
            return str;
            ^
Main.java:16: error: class, interface, or enum expected
        }catch (Exception e){
        ^
Main.java:18: error: class, interface, or enum expected
        }
        ^
Main.java:24: error: class, interface, or enum expected
            fos.write(string.getBytes());
            ^
Main.java:25: error: class, interface, or enum expected
            fos.close();
            ^
Main.java:26: error: class, interface, or enum expected
        }catch (Exception e){
        ^
15 errors

Standard output is empty