java - 分配时间与系统时间相同时的运行方法

Question

当我指定的时间与系统时间相同时，我正在尝试运行我的方法。我确信这两个日历打印输出相同的结果，但它不运行该方法。

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();
    }

}

谢谢

Answer 1

比较字符串时，使用.equals函数，而不是==:

改变

if (aa == bb){

到

if (aa.equals(bb)){

这里有一些关于此的更多信息:What is the difference between == vs equals() in Java?