where is data/data file location in phone

i store my file in this location for picture hiding File file = new File("/data/data/com.vault.vaultpckg/Files"); is work fine but after somw pics hide low memory alert come so tel my where is this file path in phone device? i wanna see file location of data/data/applcation folder what do i do?

    protected void onCreate(Bundle savedInstanceState)    {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.file); list_Files = (ListView) findViewById(R.id.list); list=(ListView) findViewById(R.id.file_list);File file = new File("/data/data/com.vault.vaultpckg/Files");file.mkdir();