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Thread: GUI not showing its J-elements???

  1. #1
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    Question GUI not showing its J-elements???

    Hi everyone,

    I have created two classes, GUI class and PROVA class. When I run the DB class, it shows a frame, but not the text fields and other elements.

    Can any of you notice any mistake in my code? Thanks in advance..


    PROVA Class:

    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.ResultSet;
    import java.sql.Statement;
    public class prova {
     
     
     
     
     
    Connection con;
    Statement st;
    ResultSet rs;
     
    public prova () {
     
    connect();
     
    }
    public void connect() {
     
    try {
     
    String driver = "sun.jdbc.odbc.Jdbc0dbcDriver";
    Class.forName(driver);
     
    String prova = "jdbc:odbc:db1";
    con = DriverManager.getConnection(prova);
    st = con.createStatement();
    String sq1 = "select * from Table1";
    rs = st.executeQuery(sq1);
     
    while (rs.next())
     
    {
     
    String fname = rs.getString("Fname");
    String lname = rs.getString("Lname");
    String age = rs.getString("Age");
    System.out.println(fname + " " + lname + " " + age);
    }
     
    }catch(Exception e){
    }
    }
     
    public static void main(String[] args) {
     
    new prova();
    new gui();
     
     
    }
    }



    GUI Class

    import javax.swing.*;
    import java.awt.*;
     
    public class gui {
     
    	JFrame f;
    	JLabel fname;
    	JLabel lname;
    	JLabel age;
    	JTextField t;
    	JTextField t1;
    	JTextField t2;
     
     
     
    	public gui() {
     
    		frame();
     
    		}
     
    	public void frame() {
     
    		f = new JFrame ();
    		f.setVisible(true);
    		f.setSize (600,400);
    		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
    		fname = new JLabel ("First Name");
    		lname = new JLabel ("Last Name");
    		age = new JLabel ("Age");
     
    		t = new JTextField(10);
    		t1 = new JTextField(10);
    		t2 = new JTextField(10);
     
    		JPanel p = new JPanel();
    		p.add(fname);
    		p.add(t);
    		p.add(lname);
    		p.add(t1);
    		p.add(age);
    		p.add(t2);
     
    		f.add(p);
     
     
     
    	}
     
     
     
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: GUI not showing its J-elements???

    notice any mistake in my code
    }catch(Exception e){
    }
    An empty catch block is a mistake. Add a call to the printStackTrace() method to show any errors.

    Another problem is the frame is shown (setVisible) BEFORE anything is added to it.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: GUI not showing its J-elements???

    please make the changes in ur code

    >>>> Code removed
    Last edited by Norm; January 3rd, 2013 at 06:07 AM. Reason: code removed - don't spoonfeed

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