/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.time.*;
import java.time.format.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
        String data = "31/04/2020";
        DateTimeFormatter fmt = DateTimeFormatter.ofPattern("dd/MM/uuuu");
        LocalDate dt = LocalDate.parse(data, fmt);
        // 31 de abril foi ajustado para 30 de abril
        System.out.println(fmt.format(dt));
 
        // usando modo STRICT, 31 de abril não é aceito
        DateTimeFormatter fmt2 = DateTimeFormatter.ofPattern("dd/MM/uuuu").withResolverStyle(ResolverStyle.STRICT);
        try {
            dt = LocalDate.parse(data, fmt2);
        } catch(DateTimeParseException e) {
        	System.out.println("Erro: " + e.getMessage());
        }
	}
}

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