在内存android studio中保存string/EditText

String myString = "Hello, World!";

EditText editText = findViewById(R.id.editText);
String userInput = editText.getText().toString();

SharedPreferences sharedPreferences = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("myString", "Hello, World!");
editor.apply();

SharedPreferences sharedPreferences = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
String userInput = editText.getText().toString();
editor.putString("userInput", userInput);
editor.apply();

public class DBHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "myDB";
    private static final int DATABASE_VERSION = 1;

    public DBHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String createTableQuery = "CREATE TABLE myTable (id INTEGER PRIMARY KEY, myString TEXT)";
        db.execSQL(createTableQuery);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        String dropTableQuery = "DROP TABLE IF EXISTS myTable";
        db.execSQL(dropTableQuery);
        onCreate(db);
    }
}

DBHelper dbHelper = new DBHelper(this);
SQLiteDatabase db = dbHelper.getWritableDatabase();

ContentValues values = new ContentValues();
values.put("myString", "Hello, World!");

db.insert("myTable", null, values);
db.close();