此私有Textview和没有私有代码的区别是什么？

Question

如果使用有什么区别

public class SplashActivity extends Activity {

private Textview xxxx;

@override
protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);


xxxx = findViewById(R.id.text_view_id); 

或这样

public class SplashActivity extends Activity {

Textview xxxx;

@override
protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);


xxxx = findViewById(R.id.text_view_id);  

在TextView前面使用 private 有什么区别