Sequence generator problem

Dear sir,
I have created one table by name massemailsendingdetails.

CREATE TABLE MASSEMAILDETAILS(
ID NUMBER,
SUBJECT VARCHAR2(20),
MATTER VARCHAR2(150),
MATTERFILE VARCHAR2(30),
STATUS VARCHAR2(20)
);
Then i created a sequence generator for an id as follows

CREATE SEQUENCE MASSEMAILDETAILS_SEQ START WITH 1 INCREMENT BY 1;

I used the following method to insert a values

public com.antares.DTO.MassMailDetailsDTO insertMassMAilDeails(
String pstrSubject, String pstrMatter, String pstrMatterFile,
String pstrStatus, String strFrom) {

ResultSet resultSet = null;
com.antares.DTO.MassMailDetailsDTO massMailDetails = null;

try {
connection = DBUtil.getOracleConnection();
statement = connection.createStatement();
System.out.println("**** Connection established ***");

int i = statement
.executeUpdate("insert into massemaildetails values(massemaildetails_seq.nextval,'"
+ pstrSubject
+ "','"
+ pstrMatter
+ "','"
+ pstrMatterFile
+ "','"
+ pstrStatus
+ "','"
+ strFrom + "')");
System.out.println("**** statement established is ***" + i);
resultSet = statement
.executeQuery("SELECT * FROM massemaildetails");

while (resultSet.next()) {
massMailDetails = new com.antares.DTO.MassMailDetailsDTO();
massMailDetails.setId(resultSet.getInt("Id"));
massMailDetails.setSubject(resultSet.getString("Subject"));
massMailDetails.setMatter(resultSet.getString("matter"));
massMailDetails
.setMatterFile(resultSet.getString("matterFile"));
massMailDetails.setStatus(resultSet.getString("status"));
massMailDetails
.setEmail_From(resultSet.getString("Email_From"));
}
} catch (SQLException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
if (resultSet != null) {
try {
resultSet.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (statement != null) {
try {
statement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
return massMailDetails;
}

Its working fine,but problem is that when i insert a values it will work and inserted the values.this one i am showing in a table ,but problem is a that it is also created a new id with a dummy values first and then inserted the values what i have given .I am nt understanding where it is going wrong ..so please help me sir..

Thanks and Regards
Harini Veerapur.