Nextval('id_increment') doesn't work - why?

Question

sorry for crossposting this as i just joined and asked in the newbie section..
I've got a main method as a driver to test a database insertion and in the line not working is -
Customer c = new Customer (select nextval('id_increment'),"Mark","Jones");
the error is to do with nextval...
java.lang.Error: Unresolved compilation problem:
     Invalid character constant
I've never used a database with java before and the line worked fine before I made the sequence. Inserting a 1 or 2 for example had worked fine before this.
Any suggestions on where to look next would be appreciated. Thanks.

Answer 1

main is just a simple test driver - the database accepts a sequenced integer, a string for name and a string for address...
package week07;
import java.sql.*;
public class main {
     * @param args
     public static void main(String[] args) {
          // TODO Auto-generated method stub
try {
     Customer c = new Customer (select nextval('id_increment'),"Mark","Jones");
     c.insertInDB();
     System.out.println("finished insertion");
catch(SQLException ex)
System.out.println("bugger");
System.out.println();
ex.printStackTrace();
Customer.java are just getters and setters and constructor, I've addes an insert method I'm testing...
package week07;
import database.Database;
import java.sql.*;
* @author Steven Clark
public class Customer {
     * @param args
     private int id;
     private String name, address;
     public Customer(int id, String name, String address) {
          super();
          // TODO Auto-generated constructor stub
          this.address = address;
          this.id = id;
          this.name = name;
     public String getAddress() {
          return address;
     public void setAddress(String address) {
          this.address = address;
     public int getId() {
          return id;
     public void setId(int id) {
          this.id = id;
     public String getName() {
          return name;
     public void setName(String name) {
          this.name = name;
public void insertInDB() throws SQLException
          Database db = new Database();
          db.update("insert into customer values ('" + getId()
                    + "', '" + getName()
                    + "', '" + getAddress() + "')");
          db.disconnect();
Finally, the table in postgreSQL is just those 3 fields - id with a sequence as primary key, a name and address. There's a sequence for id.
I'm not sure where I've gone wrong and wonder if my syntax in teh main method calling nextval() is somehow wrong?