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A progress bar with an unknown maximum typically displays an animation until the task is complete. Note: The percentage display should not be enabled 阅读全文
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A progress bar is used to visually indicate how much a task has been progressed. A progress bar can be oriented horizontally (left-to-right) or vertic 阅读全文
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By default, the progress monitor delays for a short period before it is displayed. There are two properties that control when the dialog is displayed 阅读全文
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The currently selected menu or menu item in a JMenu or JPopupMenu is tracked by MenuSelectionManager. To receive notification of changes to the curren 阅读全文
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A common feature of a user interface is to show a progress dialog that visually displays the progress of a long-running task. The dialog automatically 阅读全文
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The currently selected menu or menu item in a JMenu or JPopupMenu is tracked by MenuSelectionManager and can be retrieved by calling MenuSelectionMana 阅读全文
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By default, Swing popup menus used by JMenu and JPopupMenu are lightweight. If heavyweight components are used in the same frame, the popup menus may 阅读全文
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See e810 创建弹出菜单 for an example on how to display a popup menu. 阅读全文
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final JPopupMenu menu = new JPopupMenu(); // Create and add a menu item JMenuItem item = new JMenuItem("Item Label"); item.addActionListener(actionListener); menu.add(item); ... 阅读全文
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A menu item can receive notification of selection changes by overriding its menuSelectionChanged() method. See also e808 建立菜单栏，菜单，菜单项. 阅读全文
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A separator typically appears as a horizontal line. It is used to group related sets of menu items in a menu. 阅读全文
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By default, Swing uses a cross-platform look and feel called Metal. In most cases, it is more desirable to use a look and feel that is closer to the p 阅读全文
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When the user selects a menu item, it fires an action event. 阅读全文
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This example demonstrates how to retrieve all the default values for the current look and feel. 阅读全文
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UIManager.LookAndFeelInfo[] info = UIManager.getInstalledLookAndFeels(); for (int i=0; i<info.length; i++) { // Get the name of the look and feel that is suitable for display to the user ... 阅读全文
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To change the look and feel, you need to know the class name of the new look and feel. This example installs the Windows look and feel. See also e866 阅读全文
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// Create a list, overriding the getToolTipText() method String[] items = {"A", "B", "C", "D"}; JList list = new JList(items) { // This method is called as the cursor moves within t... 阅读全文
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By default, the width of the list is determined by the longest item and the height is determined by the number of visible lines multiplied by the tall 阅读全文
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When the set of selected items is changed, either by the user or programmatically, a list selection event is fired. 阅读全文
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// The default mode is MULTIPLE_INTERVAL_SELECTION String[] items = {"A", "B", "C", "D"}; JList list = new JList(items); // Get the current selection model mode int mode = list.g... 阅读全文
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List selection events are fired when the following methods are used to change the set of selected items (see e774 创建JList组件). 阅读全文
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By default, the items in a list are arranged vertically, in a single column, as in: It is possible to arrange the items left-to-right and top-to-botto 阅读全文
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The following methods return the indices of the selected items: The following methods return the selected item objects: 阅读全文
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// Create a list String[] items = {"A", "B", "C", "D"}; JList list = new JList(items); // Add a listener for mouse clicks list.addMouseListener(new MouseAdapter() { publi... 阅读全文
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These methods are used to find an item: These methods can be used to find the range of visible items: 阅读全文
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The default model for a list does not allow the addition and removal of items. The list must be created with a DefaultListModel. This method replaces 阅读全文
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When the set of items in a list component is changed, a list data event is fired. 阅读全文
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This example demonstrates how to list all the key bindings in a component. Text components have an additional set of key bindings called a keymap. See 阅读全文
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By default, a list allows more than one item to be selected. Also, the selected items need not be contiguous. To change this default, see e781 设置JList 阅读全文
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This example demonstrates how to modify a label component so that its text can be dragged and dropped to another component. 阅读全文
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This example demonstrates how to list all the actions in a component. A text component not only has an action map with actions, it also has keymaps wi 阅读全文
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This example creates a JLabel component with an icon. This example adds or replaces the icon in an existing JLabel component: The methods to control t 阅读全文
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This example associates a label with a text field using setLabelFor(). A mnemonic is set on the label. When the mnemonic keystroke is pressed, the tex 阅读全文
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The KeyStroke.toString() method does not return a string that can be parsed by KeyStroke.getKeyStroke(). The method keyStroke2String() in this example 阅读全文
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This example creates a number of keystrokes and adds them to the input map of a component. When a keystroke is added to an input map, an action name m 阅读全文
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// The text is left-justified and vertically centered JLabel label = new JLabel("Text Label"); // The text is horizontally and vertically centered label = new JLabel("Text Label",... 阅读全文
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A frame is a component container that displays its contents in a top-level window with a title bar and buttons to resize, iconify, maximize, and close 阅读全文
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By default, when the close button on a frame is clicked, nothing happens. This example shows how to exit the application when the frame is closed: 阅读全文
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By default, when the close button on a frame is clicked, nothing happens. This example shows how to make the action hide the frame. One reason for hid 阅读全文
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This example demonstrates a text field that validates its contents when it receives a permanent focus-lost event. If the contents are invalid, it disp 阅读全文