åbne nyt vindue

Du laver en nyt objekt af typen JFrame eller en klasse some xtender JFrame
og kalder show på den.

Jeg havde dette eksempel liggende:

import java.awt.*;
import java.awt.event.*;

import java.util.*;

import javax.swing.*;

public class FirstClass extends JFrame implements ActionListener {
  private JButton callsec;
  private JLabel data;
  private SecondClass sec;
  public FirstClass() {
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      getContentPane().setLayout(new GridLayout(1, 2));
      callsec = new JButton("Open Second");
      callsec.addActionListener(this);
      getContentPane().add(callsec);
      data = new JLabel("Not updated yet");
      getContentPane().add(data);
      pack();
  }
  public void update() {
      data.setText("I am updated " + new Date());
  }
  public void actionPerformed(ActionEvent ev) {
      sec = new SecondClass(this);
      sec.show();
  }
  public static void main(String[] args) {
      FirstClass f = new FirstClass();
      f.show();
  }
}

class SecondClass extends JFrame implements ActionListener {
  private JButton setfirst;
  private JButton back;
  private FirstClass first;
  public SecondClass(FirstClass first) {
      this.first = first;
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      getContentPane().setLayout(new GridLayout(2, 1));
      setfirst = new JButton("Update");
      setfirst.addActionListener(this);
      getContentPane().add(setfirst);
      back = new JButton("Close");
      back.addActionListener(this);
      getContentPane().add(back);
      pack();
  }
  public void actionPerformed(ActionEvent ev) {
      if (ev.getSource() == setfirst) {
        first.update();
      }
      if (ev.getSource() == back) {
        dispose();
      }
  }
}

og et svar

Tak Arne, det ser jo ud til at dække 8o)