import java.time.DateTimeException;
    import java.time.LocalDate;
    import java.time.format.DateTimeFormatter;
    import java.time.format.ResolverStyle;
    import java.util.Locale;
 
    public class Main {
    	public static void main(String[] args) {
    		String strDate = "2021/02/31";
    		DateTimeFormatter dtf = DateTimeFormatter.ofPattern("uuuu/MM/dd", Locale.ENGLISH)
    				.withResolverStyle(ResolverStyle.STRICT);
    		try {
    			LocalDate date = LocalDate.parse(strDate, dtf);
    			// ...
    		} catch (DateTimeException e) {
    			System.out.println(e.getMessage());
    		}
    	}
    }

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