Delete from Database?

Question

How do you delete a row from a database. I have 2 columns (user and password)in the Database so far with 4 records. I have constructed a frame with 4 radiobuttons and a jbutton. I want the program to delete for example the first record if the first radiobutton is selected. I am nearly there but I need a little help.I am struggling with the SQL code needed.
here is what i've done so far:
public void deleteser(){
String rdsn = "jdbc:borland:dslocal:C:\\JBuilder6\\bin\\userinfo.jds";
String rdbUser = "Adham";
String rdbPass = "reqs";
try {
Connection cons = DriverManager.getConnection(rdsn, rdbUser, rdbPass);
Statement stmnt = cons.createStatement();
String query = "SELECT*FROM Users"; // Users is the name of the table
ResultSet rs = stmnt.executeQuery(query); // ResultSet object to hold the result of the query
//int cnt = 0;
while (rs.next()) {                                                                                       String s = rs.getString("User");
String p = rs.getString("Password");
//cnt++;
if (duser1.isSelected()){
break;}
else if (duser2.isSelected()){
break;}
else if (duser3.isSelected()){
break;}
else if (duser4.isSelected()){
break;}
else if (duser5.isSelected()){
break;}
rs.close();
stmnt.close();
cons.close();
} catch (Exception e) {
e.printStackTrace();
return;

Answer 1

Still unable to do it, this is how it looks now:
public void deleteser(){
String rdsn = "jdbc:borland:dslocal:C:\\JBuilder6\\bin\\userinfo.jds"; // the odbc address of the DB.
String rdbUser = "Adham"; // the user account to the DB.
String rdbPass = "reqs"; // password for the dbuser.
try {
Connection cons = DriverManager.getConnection(rdsn, rdbUser, rdbPass); // gets a connection to the DB
Statement stmnt = cons.createStatement();
Statement instmnt = cons.createStatement(); // get a statement which can execute the sql-code
String query = "SELECT * FROM Users"; // Users is the name of the table
ResultSet rs = stmnt.executeQuery(query); // ResultSet object to hold the result of the query
int cnt = 0;
while (rs.next()) {                                                   // 'next' takes you down to the next row of the DB
String s = rs.getString("User");
String p = rs.getString("Password");
cnt++;
if (cnt==1 && duser1.isSelected()){
String sql = ("DELETE FROM USERS VALUES ('"+ s + "','"+ p +"')");
instmnt.executeUpdate(sql);}
else if (cnt==2 && duser2.isSelected()){
String sql = ("DELETE FROM USERS VALUES ('"+ s + "','"+ p +"')");
instmnt.executeUpdate(sql);}
else if (cnt==3 && duser3.isSelected()){
String sql = ("DELETE FROM USERS VALUES ('"+ s + "','"+ p +"')");
instmnt.executeUpdate(sql);}
else if (cnt==4 && duser4.isSelected()){
String sql = ("DELETE FROM USERS VALUES ('"+ s + "','"+ p +"')");
instmnt.executeUpdate(sql);}
else if (cnt==5 && duser5.isSelected()){
String sql = ("DELETE FROM USERS VALUES ('"+ s + "','"+ p +"')");
instmnt.executeUpdate(sql);}
rs.close();
stmnt.close();
cons.close();
} catch (Exception e) {
e.printStackTrace();
return;