import java.sql.*;

public class jdbc_ex01 {
    public static void main(String[] args)
    {
        Connection conn = null;
        ResultSet rs = null;
        Statement stmt = null;
        String url = null;
        String id = "hr";
        String pw = "hr";
    
        try{
            url ="jdbc:oracle:thin:@10.0.0.2:1521:ORCL";
            Class.forName("oracle.jdbc.driver.OracleDriver");
            conn = DriverManager.getConnection(url,id,pw);
            
            System.out.println("DB connection complete");
                
            stmt = conn.createStatement();
            rs = stmt.executeQuery("select userid,userpw from admin");
    
            while(rs.next()){
                String userid = rs.getString(1);
                String userpw = rs.getString(2);
                System.out.println(userid +", "+userpw);
            }
            stmt.close();
            conn.close();
        } catch (Exception e){
            e.printStackTrace();
        }
    }
}

 javac jdbc_sample.java 

D:\>java jdbc_sample
DB connection complete
test1, 1111
admin, 1234