How to add panel in from other class

[adeeb alexander]

Hi all.
I have two classes. I need to display the JPanel from second class. The code is below

Login.java

    
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import static javax.swing.GroupLayout.Alignment.*;
import java.io.*;
import java.sql.*;
//import java.util.*;
//import java.sql.Date.*;
import java.text.*;
import java.awt.print.*;
import javax.print.*;
//import java.util.Timer;
import java.util.Date;
import java.text.*;

public class Login implements ActionListener 
{
	private JLabel log,pass,tim;
	private JTextField logtf;
	private JPasswordField passtf;
	private JButton ok;
	private JPanel panel,panel1,mpanel;
	private JFrame f;
	Container c;
	Connection conn;
	ResultSet rs;
	PreparedStatement ps;
	CardLayout cl = new CardLayout();
	int ck;
	ImageIcon icon;
	Image image;
	
	public Login(){
		log = new JLabel("User Name");
		pass = new JLabel("Password");
		logtf = new JTextField(25);
		passtf = new JPasswordField(25);
		ok = new JButton("Login");
		ok.addActionListener(this);
		f = new JFrame("User Login");
		icon = new ImageIcon("login.jpg");
		panel = new JPanel()
		{
			protected void paintComponent(Graphics g)
			{
				Dimension d = getSize();
				g.drawImage(icon.getImage(), 0, 0, d.width, d.height, null);
 
				super.paintComponent(g);
			}
		};
		panel.setOpaque( false );
		panel.setPreferredSize( new Dimension(400, 400) );
		
		panel1 = new JPanel();
		Main si = new Main();
		mpanel = new JPanel(si);
		panel1.setLayout(cl);
		panel1.add(panel,"1");
		panel1.add(mpanel,"2");
		
		GroupLayout gl = new GroupLayout(panel);
		panel.setLayout(gl);
		gl.setAutoCreateContainerGaps(true);
		gl.setAutoCreateGaps(true);
		gl.setHorizontalGroup(gl.createParallelGroup()
		.addGroup(gl.createSequentialGroup()
		.addGap(250)
		.addGroup(gl.createParallelGroup()
		.addComponent(log)
		.addComponent(pass))
		)
		.addGroup(gl.createSequentialGroup()
		.addGap(190,190,330)
		.addGroup(gl.createParallelGroup()
		.addComponent(logtf,0,100,150)
		.addComponent(passtf,0,100,150))
		)
		.addGroup(gl.createSequentialGroup()
		.addGap(190,190,360)
		.addGroup(gl.createParallelGroup()
		.addComponent(ok))
		)
		);
		gl.setVerticalGroup(gl.createSequentialGroup()
		.addGap(300)
		.addGroup(gl.createParallelGroup(BASELINE)
		.addComponent(log)
		.addComponent(logtf))
		.addGroup(gl.createParallelGroup(BASELINE)
		.addComponent(pass)
		.addComponent(passtf))
		.addGap(20)
		.addGroup(gl.createParallelGroup()
		.addComponent(ok))
		);
		
		f.getContentPane().add(panel1);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setSize(700, 700);
		f.setLocationRelativeTo( null );
		f.setVisible(true);
	}
	
public void actionPerformed(ActionEvent ae)
{
	cl.show(panel1,"2");
}
	
	public static void main(String args[])
	{
		try
		{
			UIManager.setLookAndFeel("com.birosoft.liquid.LiquidLookAndFeel");
				com.birosoft.liquid.LiquidLookAndFeel.setLiquidDecorations(true, "mac");
			com.birosoft.liquid.LiquidLookAndFeel.setShowTableGrids(true);
		}
		catch(Exception ce)
		{
			System.out.println(ce);
		}
		
		Login frame = new Login();
	}
}

Main.java

    
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import static javax.swing.GroupLayout.Alignment.*;
import java.io.*;
import java.sql.*;
//import java.util.*;
//import java.sql.Date.*;
import java.text.*;
import java.awt.print.*;
import javax.print.*;
//import java.util.Timer;
import java.util.Date;
import java.text.*;

public class Main implements ActionListener
{
	JButton prt,veh,alert,trip,mod;
	JPanel panel;
	JFrame f;
	ImageIcon icon;
	Image image;
	
	public Main()
	{
		prt = new JButton(new ImageIcon("prtd.gif"));
		prt.addActionListener(this);
		veh = new JButton(new ImageIcon("veh.gif"));
		veh.addActionListener(this);
		alert = new JButton(new ImageIcon("alert.gif"));
		alert.addActionListener(this);
		trip = new JButton(new ImageIcon("trip.gif"));
		trip.addActionListener(this);
		mod = new JButton (new ImageIcon("mod.gif"));
		mod.addActionListener(this);
		f = new JFrame("Preventive Vehicle Management™ © 2009"+"   		 Main");
		icon = new ImageIcon("main1.jpg");
		
		panel = new JPanel()
		{
			protected void paintComponent(Graphics g)
			{
				Dimension d = getSize();
				g.drawImage(icon.getImage(), 0, 0, d.width, d.height, null);
				super.paintComponent(g);
			}
		};
		panel.setOpaque( false );
	//	panel.setPreferredSize( new Dimension(400, 400) );
		
		GroupLayout gl = new GroupLayout(panel);
		panel.setLayout(gl);
		gl.setAutoCreateContainerGaps(true);
		gl.setAutoCreateGaps(true);
		gl.setHorizontalGroup(gl.createParallelGroup(LEADING)
		.addGroup(gl.createSequentialGroup()
		.addGap(100)
		.addGroup(gl.createParallelGroup(LEADING)
		.addComponent(prt)
		.addComponent(veh))
		)
		.addGroup(gl.createSequentialGroup()
		.addGap(300)
		.addGroup(gl.createParallelGroup(LEADING)
		.addComponent(trip))
		)
		.addGroup(gl.createSequentialGroup()
		.addGap(500)
		.addGroup(gl.createParallelGroup(LEADING)
		.addComponent(alert)
		.addComponent(mod))
		)
		);
		gl.setVerticalGroup(gl.createSequentialGroup()
		.addGap(100)
		.addGroup(gl.createParallelGroup(BASELINE)
		.addComponent(prt)
		.addComponent(alert))
		.addGap(100)
		.addGroup(gl.createParallelGroup(BASELINE)
		.addComponent(trip))
		.addGap(100)
		.addGroup(gl.createParallelGroup(BASELINE)
		.addComponent(veh)
		.addComponent(mod))
		);
		
		f.getContentPane().add(panel);
		f.setSize(700,700);
		f.setVisible(true);
	}
public void actionPerformed(ActionEvent ae)
{

}
	public static void main(String args[])
	{
		try
		{
			UIManager.setLookAndFeel("com.birosoft.liquid.LiquidLookAndFeel");
			com.birosoft.liquid.LiquidLookAndFeel.setLiquidDecorations(true, "mac");
			com.birosoft.liquid.LiquidLookAndFeel.setShowTableGrids(true);
		}
		catch(Exception ce)
		{
			System.out.println(ce);
		}
		new Main();
	}
}

I get the error at line 59 i.e mpanel = new JPanel(si);

I need a little help please point at the mistake.

Thanks and Regards
alexander

[Rob Spoor]

JPanel does not have a constructor that takes an ActionListener as an argument.

Can you tell us, in words, what you are trying to do on that line?

[pete stein]

Your Main application isn't a JPanel and doesn't offer a JPanel that can be used anywhere. Instead it is geared to create a JFrame and displays an app in the JFrame. Fortunately it can be modified to allow us to extract its JPanel. Have a look at some changes I've made:

public class Main implements ActionListener {
  JButton prt, veh, alert, trip, mod;
  JPanel panel;
  //JFrame f;
  ImageIcon icon;
  Image image;

  @SuppressWarnings("serial")
  public Main() {
    //..... code deleted for sake of brevity
//    f = new JFrame("Preventive Vehicle Management™© 2009"
//        + "         Main");

    panel = new JPanel() {
      protected void paintComponent(Graphics g) {
        Dimension d = getSize();
        g.drawImage(icon.getImage(), 0, 0, d.width, d.height, null);
        super.paintComponent(g);
      }
    };
    //..... code deleted for sake of brevity
  }

  public void actionPerformed(ActionEvent ae) {

  }
  
  /**
   * extracts our main JPanel
   * for outside classes to use
   */
  public JPanel getPanel() {
    return panel;
  }
  
  // if you still want to display this class by itself in a JFrame
  public static void main(String args[]) {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        Main main = new Main();

        JFrame frame = new JFrame(
            "Preventive Vehicle Management™© 2009"
                + "         Main");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(main.getPanel());
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
      }
    });
    
  }
}

and then in Login:

    Main si = new Main();
    //mpanel = new JPanel(si);
    mpanel = si.getPanel();