将字符串类型转换为Date错误，以返回类型-ClassCastException

Question

I having method that i move type object (in this time type object is type String ) and i want to cast it to type date how should i do that . when i use the following code i getting error :

java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Date

Code:

} else if (typeName.equals("Date")) {

    return new SwitchInputType<Date>((Date) memberValue);

Answer 1

How to parse a date?

SimpleDateFormat parserSDF=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date = parserSDF.parse(memberValue);

Answer 2

You cannot simply cast a String to a Date . To get a Date from a String object which has the String representation of Date , use SimpleDateFormat .

Eg:

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); //Change format according to your needs.
Date date = new Date();
try{
    date = sdf.parse((String)memberValue); //Update:- memberValue.toString() will also work.
}catch(ParseException pe){
    //Do something on Exception.
}
return new SwitchInputType<Date>(date);

Answer 3

If its a string, you need to parse it. Try using SimpleDateFormat with appropriate format.

Answer 4

尝试创建像这样的新日期对象Date date = new Date(long)或者如果您使用Date类创建了此字符串，请使用其静态方法Date.valueOf(String s) 。

Answer 5

You should first convert the string to date object before assigning to a Date. Use SimpleDateFormat.parse() method to parse the string to a Date object.

Answer 6

您可以使用：

return new SwitchInputType<Date>(new SimpleDateFormat("MMMM d, yyyy", Locale.ENGLISH).parse(memberValue));

Answer 7

Something like this should work:

final SimpleDateFormat parsedDate = new SimpleDateFormat("yyyy-MM-dd");

final Date date;
try{ 
    date = parsedDate.parse(stringValue); 
} catch(Exception e) {
    // handle the exception.
}