import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.border.BevelBorder;

public class FrmPrincipal extends JFrame {

	private static final long serialVersionUID = 1L;
	private JButton jButton = new JButton("presioname");
	private JTextField jLabel = new JTextField("respuesat");

	public FrmPrincipal() {
		intialise();
	}

	public void intialise() {
		jLabel.setBorder(new BevelBorder(BevelBorder.RAISED));
		jButton.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				jbuton_actionPerformed(e);
			}
		});
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setLocationRelativeTo(null);
		setLayout(new FlowLayout());
		getContentPane().add(jLabel);
		getContentPane().add(jButton);

		pack();
	}

	public void jbuton_actionPerformed(ActionEvent e) {
		FrmProducto frmData = new FrmProducto(this, true);
		frmData.setVisible(true);
		String respuesta = frmData.getDato();
		jLabel.setText(respuesta);
	}

	public static void main(String arg[]) {
		FrmPrincipal frmPrincipal = new FrmPrincipal();
		frmPrincipal.setVisible(true);
	}
}

import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class FrmProducto extends JDialog {

	private static final long serialVersionUID = 1L;
	private JTextField jTextField = new JTextField("ingrese aqui el dato");

	public FrmProducto(JFrame frame, Boolean modal) {
		super(frame, modal);
		initialise();
	}

	public void initialise() {
		getContentPane().add(jTextField);
		pack();
	}

	public String getDato() {
		return jTextField.getText();
	}
}