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

This error occurs when you try to cast a String object to a Date object using the Java typecasting operator. It is not possible to convert a String object to a Date object directly.

To convert a String to a Date object, you need to use the SimpleDateFormat class or another Date parsing library. For example:

String dateString = "2022-05-30";
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date date = format.parse(dateString);

This will create a Date object from the dateString string using the specified date format.

相关问题

java.lang.string cannot be cast to java.util.Date

This error occurs when you try to cast a String object to a Date object, but the String object is not in the correct format to be converted to a Date object.

For example, if you have a String "2021-01-01" and you try to cast it to a Date object using the following code:

String dateString = "2021-01-01";
Date date = (Date) dateString;

You will get the error java.lang.string cannot be cast to java.util.Date because the String object cannot be directly cast to a Date object.

To convert a String to a Date object, you need to use a SimpleDateFormat object and specify the format of the date string. Here is an example:

String dateString = "2021-01-01";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date date = sdf.parse(dateString);

This code creates a SimpleDateFormat object with the pattern "yyyy-MM-dd" which matches the format of the dateString. The parse() method is then called on the SimpleDateFormat object to convert the String to a Date object.

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

This error occurs when you try to cast a String object to a Date object, but the String object is not a valid date format.

For example, if you have a String "hello" and try to cast it to a Date object like this:

Date date = (Date) "hello";

You will get a ClassCastException because "hello" is not a valid date format.

To fix this error, you need to make sure that the String object you are trying to cast is a valid date format. You can use a SimpleDateFormat object to parse the String into a Date object like this:

String dateString = "2021-01-01";
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
Date date = dateFormat.parse(dateString);

Now you can safely cast the Date object to a String object without getting a ClassCastException.