java语言程序设计 基础篇 原书第八版 课件 PPT(第十七章).pptVIP

Liang, Introduction to Java Programming, Eighth Edition, (c) 2011 Pearson Education, Inc. All rights reserved. 0132130807 Chapter 17Creating User Interfaces Motivations A graphical user interface (GUI) makes a system user-friendly and easy to use. Creating a GUI requires creativity and knowledge of how GUI components work. Since the GUI components in Java are very flexible and versatile, you can create a wide assortment of useful user interfaces. Previous chapters briefly introduced several GUI components. This chapter introduces the frequently used GUI components in detail. Objectives To create graphical user interfaces with various user-interface components: JButton, JCheckBox, JRadioButton, JLabel, JTextField, JTextArea, JComboBox, JList, JScrollBar, and JSlider (§§17.2–17.11). To create listeners for various types of events (§§17.2–17.11). To explore JButton (§17.2) To explore JCheckBox (§17.3) To explore JRadioButton (§17.4) To explore JLabel (§17.5) To explore JTextField (§17.6) To explore JTextArea (§17.7) To explore JComboBox (§17.8) To explore JList (§17.9) To explore JScrollBar (§17.10) To explore JSlider (§17.11) To display multiple windows in an application (§17.12). Components Covered in the Chapter Introduces the frequently used GUI components Uses borders and icons Buttons A button is a component that triggers an action event when clicked. Swing provides regular buttons, toggle buttons, check box buttons, and radio buttons. The common features of these buttons are generalized in javax.swing.AbstractButton. AbstractButton JButton JButton inherits AbstractButton and provides several constructors to create buttons. JButton Constructors The following are JButton constructors: JButton() JButton(String text) JButton(String text, Icon icon) JButton(Icon icon) JButton Properties text icon mnemonic horizontalAlignment verticalAlignment horizontalTextPosition verticalTextPosition iconTextGap Default Icons, Pressed Icon, and Rollover Icon A regular button has