import java.awt.*;
import java.sql.*;
import java.io.*;
public class  stud extends Frame{
        public static void main(String[] args) {
                String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
                String url = "jdbc:odbc:jdbc" ;
                Connection con = null;
                Statement stmt = null;
                
                String sql = "Insert into member (num, name, addr, phone) values";

                String num, name, addr, phone;

                try{
                        public stud (String str) { <--이부분
                        super(str);
                        setLayout(new FlowLayout());//화면에 배치
                        Label lbl1 = new Label("학번 입력");
                        Label lbl2 = new Label("이름 입력");
                        Label lbl3 = new Label("주소 입력");
                        Label lbl4 = new Label("전화번호 입력");
                        TextField txt1 = new TextField(8);
                        TextField txt2 = new TextField(4);
                        TextField txt3 = new TextField();
                        TextField txt4 = new TextField();
                        add(lbl1); add(txt1); add(lbl2); add(txt2);add(lbl3); add(txt3);add(lbl4); add(txt4);//화면에 첨부
                        setSize(300,200);//Frame 크기
                        setVisible(true);//Frame을 띄어주는 것
                        }
                        num = txt1;
                        name = txt2;
                        addr = txt3;
                        phone = txt4;
                        sql += "('" + num +"', '" + name + "', '" + addr + "', '" + phone + "')";
                        System.out.println( sql );
                        Class. forName(driver);
                        con = DriverManager. getConnection(url, " master ", "java");
                        stmt = con.createStatement();
                        stmt.executeUpdate(sql);
                        System.out.println("데이터베이스 연결 성공!");
        }
        catch(Exception e){
                System.out.println("데이터베이스 연결 실패!");
        }
        finally{
                try{
                if(con != null) con.close();
                if(stmt != null) stmt.close();
                }
                catch(Exception e){
                        System.out.println( e. getMessage());
                }
        }
}
}
인데 에러나는 부분은 화살표로 표시하였습니다.