Android) SharedPreference 사용법 (Java, Kotlin)

lateinit var pref : SharedPreferences;
lateinit var editor: SharedPreferences.Editor;


override fun onCreate(savedInstanceState: Bundle?) {

		pref  = getSharedPreferences("folder_key", MODE_PRIVATE);
        editor = pref.edit();
        
        //자료 불러오기
        pref.getString("key","")
        
        //자료 저장하기
        editor.putString("key", getFcmToken)
        editor.commit();

}