Java向ORACLE中插入时间

public class Test{

public static void main (String args []){ 

java.util.Date a = new java.util.Date();

System.out.println(a);

java.sql.Date b = new java.sql.Date(a.getTime());

System.out.println(b);

java.sql.Time c = new java.sql.Time(a.getTime());

System.out.println(c);

java.sql.Timestamp d=new java.sql.Timestamp(a.getTime());

new java.sql.Time(simpleDateFormat.parse("2018-09-10")