Java图形用户界面1

TextField
public class TextField extends TextComponent{ public TextField() public TextField(String text) public TextField(int columns) public TextField(String text, int columns) public String getText() public void setText(String str) public void setEditable(boolean b) ...... }
the frame will be sized to display just the title bar.
Dialog
public class Dialog extends Window{ public Dialog(Frame owner); public Dialog(Frame owner, String title); public Dialog(Frame owner, Boolean modal); public Dialog(Frame owner, String title, Boolean modal); ...... }
Event---event object
An event can be defined as a signal to the program that something has happened.
Frame
public class Frame extends Window implements MenuContainer{ public Frame(); public Frame(String title); public String getTitle(); public void setTitle(String title); public void setBackground(Color c); public void setResizable(boolean resizable); public void setSize(int width, int height) public void setVisible(boolean b) public void setLocation(int x, int y) public Component add(Component comp) comp public void setLayout(LayoutManager mgr) ...... }
Button
public class Button extends Component implements Accessible{ public Button() public Button(String label) public String getLabel() public void setLabel(String label) ...... }
JTableHeader JInternalFrame JProgressBar
container classes helper classses component classes
JEditorPane
A
JTextField JTextArea
JPasswordField
Fig 6.2 Jcomponent and its subclasses are the basic elements for building graphical user interfaces.
Window and Panel
public class Window extends Container implements Accessible
Frame Window
Dialog
public class Panel extends Container implements Accessible

lightweight components heavyweight components

peers
SWT
SWT is specialized used for Eclipse Projects.
Dimension Font FontMetrics Color
Classes in the java.awt package LayoutManager Heavyweight
Panel
Applet Frame Dialog
JApplet JFrame JDialog
Graphics
Component Container Window
Lightweight
JComponent
Swing Components in the javax.swing.package
Fig6.1Java GUI programming utilizes the classes shown in this hierarchical diagram
Container
Container classes are GUI components that are used as containers to contain other GUI components.
public class Container extends Component { public Component add(Component comp) public void add(Component comp, Object limits) public Component add(Component comp, int index) public void remove(Component comp) public void removeAll() ...... }
6.1.2 Introduction to AWT
Abstract Windows Toolkit(AWT) is a library used for GUI programming.
ng.Object
Frame Window Container Label
Button Panel Dialog ......
Chapter 6
GUI Programming
Java 2007
6.1 Introduction
6.1.1 Java‟s GUI Programming

Swing AWT
Swing is another library used for GUI programming. Abstract Windows Toolkit(AWT) is a library used for GUI programming.
Example 6.1 Creating a frame
import java.awt.*; public class StudentFrame{ public static void main(String args[]){ Frame f = new Frame("Student Management System"); f.setSize(200,200); Note: f.setBackground(Color.lightGray); The frame f.setVisible(true);is not displayed until the } f.setVisible(true) is applied. And if } the f.setSize(200, 200) is not used,
JMenuItem AbstractButton JButton
JCheckBoxMenuItem JMenu
JRadioButtonMenuItem JCheckBox JRadioButton
JToggleButton
JComponent
JTextComponent JLabel JList
A JComboBox JPanel JOptionPane JScrollBar
Component Layout classes
AWTEvent
java.applet.Applet
Color Font Graphics
Image ......
TextComponent ......
Fig6.3 classes and their relationships in java.awt
Component
public abstract class Component extends Object implements ImageObserver, MenuContainer{ public void setSize(int width, int height) public void getWidth() public void getHeight() public void setLocation(int x, int y) public void setBounds() public int getX() public int getY() ...... }
import java.awt.*; public class UserLoginFrame extends Frame{ public UserLoginFrame(){ super(“UserLogin”); public static void main(String args[]){ this.setSize(280,120); new UserLoginFrame(); this.setBackground(Color.lightGray); } this.setLocation(300,240); this.setLayout(new FlowLayout()); this.add(new Label(“userid”)); this.add(new TextField(“user1”, 20)); this.add(new Label(“password”)); this.add(new TextField(20)); this.add(new Button(“OK”)); this.add(new Button(“Cancel”)); this.setVisible(true); } ...... }