分配時間與系統時間相同時的運行方法

Question

我試圖在我的分配時間與系統時間相同時運行我的方法。我確信這兩個日曆打印輸出結果相同，但它不運行該方法。

public class Intake extends Fragment { 

TextView tv1, tv2,tv3; 

public View onCreateView(LayoutInflater inflater, 
         ViewGroup container, Bundle savedInstanceState){ 

    return inflater.inflate(R.layout.intake, container, false); 
} 

@Override 
public void onViewCreated(View view, Bundle savedInstanceState){ 
    tv1 = (TextView) getActivity().findViewById(R.id.tv1); 
    tv2 = (TextView) getActivity().findViewById(R.id.tv2); 
    tv3 = (TextView) getActivity().findViewById(R.id.tv3); 

    Calendar settime = Calendar.getInstance(); 
    settime.set(Calendar.HOUR_OF_DAY, 10); 
    settime.set(Calendar.MINUTE,46); 
    settime.set(Calendar.SECOND,10); 

    Calendar systime = Calendar.getInstance(); 
    systime.getTime(); 


    SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss"); 


    String aa = String.valueOf((sdf.format(settime.getTime()))); 
    String bb = String.valueOf((sdf.format(systime.getTime()))); 

    tv1.setText(aa); 
    tv2.setText(bb); 
    if (aa == bb){ 
     runMath(); 
    } 

} 

}

感謝您

Answer 1

比較字符串時，使用.equals功能，而不是==：

變化

if (aa == bb){ 

到

if (aa.equals(bb)){ 

這裏有一些這方面的更多信息：What is the difference between == vs equals() in Java?