为什么不能在类的构造函数中调用静态方法？

Question

obviously my Java Pause was too long...

I have the following classes:

public class TimeLine {

    public static final String TIME_LINE_DATE_FORMAT = "dd.MM.yyyy";


    public TimeLine(Context context, LinearLayout layout)
    {
        this.context = context;
        this.layout = layout;           
    }

    // some methods and stuff

    public static Date getDateFromString(String dateString)
    {
        SimpleDateFormat s = new SimpleDateFormat(TIME_LINE_DATE_FORMAT);
        try {
            return s.parse(dateString);
        } catch (ParseException e) {            
            e.printStackTrace();
            return null;
        }
    }
}

I use the parsing of a String to a Date quite often, that's why I wanted to have this function only 1 time & static.

I try to access it like this:

public class TrackedValue {

    private double value;
    private String unit;
    private Date date;

    public TrackedValue()
    {       
    }

    public TrackedValue(Date date, String unit, double value)
    {
        this.date = date;
        this.unit = unit;
        this.value = value;
    }

    public TrackedValue(String dateString, String unit, double value)
    {      
        this.date = TimeLine.getDateFromString(dateString); //Here's the error
        this.unit = unit;
        this.value = value;
    }

    // some getters and setters here

}

This brings me the error: The method getDateFromString(String) is undefined for the type timeline

Err... why?

Answer 1

Look at your imports section.

Is YOUR timeline class referenced there or is there another from some other jar you have imported to your application?

Answer 2

Why can't I call a static method in the constructor of a class?

You can call static method in your constructor and no one can stop you unless you don't have access to the method like access modifier restriction.

There could be problem in your import statement .Please check TimeLine class is there or is this imported correctly.

Answer 3

dah ... TimeLine没有保存，因此没有被编译...我现在有点愚蠢：-/谢谢大家！