import javax.swing. *; import java.awt.*; import java.awt.event. *; public class FinalGUI { JButton startButton, stopButton; JLabel label; public (1) { JFrame f = new JFrame ("SwingApp2"); f.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); //1.3+ createGUI (f); initListeners (); (2) f.setVisible ( (3) } void initListeners () { ActionListener action1 = new MyActionListener(); startButton.addActionListener stopButton.addActionListener( (action1); (4) } class MyActionListener implements (5) { public void action Performed (ActionEvent e) { if (e.getSource () == startButton) { startButton.setEnabled( (6) ); stopButton.setEnabled( (7) ); label.setText ("Press Stop."); } else { stopButton.setEnabled( (8) ); (9); label.setText ("Press Start."); startButton = new JButton ("Start"); stopButton = new JButton ("Stop"); stopButton.setEnabled(false); (10) Container c = f.getContentPane (); c.add(startButton, BorderLayout.WEST); c.add(stopButton, BorderLayout.EAST); c.add(label, BorderLayout.SOUTH); } public static void main(String[] args) { new FinalGUI (); } SAMPLE OUTPUT: ●●● FinalGUI Start Stop Click Start. } void createGUI (JFrame f) { = new JLabel("Press Start.", JLabel.CENTER); ●●● FinalGUI Start Stop Click Stop.

import javax.swing. ; import java.awt.; import java.awt.event. *; public class FinalGUI { JButton startButton, stopButton; JLabel label; public (1) { JFrame f = new JFrame ("SwingApp2"); f.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); //1.3+ createGUI (f); initListeners (); (2) f.setVisible ( (3) } void initListeners () { ActionListener action1 = new MyActionListener(); startButton.addActionListener stopButton.addActionListener( (action1); (4) } class MyActionListener implements (5) { public void action Performed (ActionEvent e) { if (e.getSource () == startButton) { startButton.setEnabled( (6) ); stopButton.setEnabled( (7) ); label.setText ("Press Stop."); } else { stopButton.setEnabled( (8) ); (9); label.setText ("Press Start."); startButton = new JButton ("Start"); stopButton = new JButton ("Stop"); stopButton.setEnabled(false); (10) Container c = f.getContentPane (); c.add(startButton, BorderLayout.WEST); c.add(stopButton, BorderLayout.EAST); c.add(label, BorderLayout.SOUTH); } public static void main(String[] args) { new FinalGUI (); } SAMPLE OUTPUT: ●●● FinalGUI Start Stop Click Start. } void createGUI (JFrame f) { = new JLabel("Press Start.", JLabel.CENTER); ●●● FinalGUI Start Stop Click Stop.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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