Auto Increment ID Field Table in the Oracle Database (insert new record)

Question

I have been using the MySQL. And the ID field of the database table is AUTO INCREMENT. When I insert a new record into a database table, I can have a statement like:
   public void createThread( String receiver, String sender, String title,
                             String lastPostMemberName, String threadTopic,
                             String threadBody, Timestamp threadCreationDate,
                             Timestamp threadLastPostDate, int threadType,
                             int threadOption, int threadStatus, int threadViewCount,
                             int threadReplyCount, int threadDuration )
                             throws MessageDAOSysExceptionand I do not have to put the ID variable in the above method. The table will give the new record an ID number that is equivalent to the ID number of the last record plus one automatically.
Now, I am inserting a new record into an Oracle database table. I am told that I cannot do what I am used to doing with the MySQL database.
How do I revise the createThread method while I have no idea about what the next sequence number shall be?

Answer 1

I am still very confused; in particular, the Java part. Let me try again.
// This part is for the database table creation
-- Component primary key sequence
CREATE SEQUENCE dhsinfo_page_content_seq
    START WITH 0;
-- Trigger for updating the Component primary key
CREATE OR REPLACE TRIGGER DHSInfoPageContent_INSERT_TRIGGER
    BEFORE INSERT ON DHSInfoPageContent //DHSInfoPageContent is the table name
    FOR EACH ROW WHEN (new.ID IS NULL) // ID is the column name for auto increment
    BEGIN
        SELECT dhsinfo_page_content_seq.Nextval
        INTO :ID
        FROM DUAL;
    END;/I am uncertain what to do with my Java code. (I have been working with the MySQL. Changing to the Oracle makes me very confused.
   public void updateContent( int groupID, String pageName, int componentID,
                              String content, Timestamp contentCreationDate )
                               throws contentDAOSysException
   // The above Java statement does not have a value to insert into the ID column
   // in the DHSInfoPageContent table
      Connection conn = null;
      PreparedStatement stmt = null;
      // what to do with the INSERT INTO below.  Note the paramether ID.
      String insertSQL = "INSERT INTO DHSInfoPageContent( ID, GroupID, Name, ComponentID, Content, CreationDate ) VALUES (?, ?, ?, ?, ?, ?)";
      try
         conn = DBConnection.getDBConnection();
         stmt = conn.prepareStatement( insertSQL );
         stmt.setInt( 1, id ); // Is this Java statement redundant?
         stmt.setInt( 2, groupID );
         stmt.setString( 3, pageName );
         stmt.setInt( 4, componentID );
         stmt.setString( 5, content );
         stmt.setTimestamp( 6, contentCreationDate );
         stmt.executeUpdate();
       catch
       finally