java初学者必看ppt

/** @version 1.11 2002-07-10 @author Cay Horstmann */ package Components.SliderTest; import java.awt.*; import java.awt.event.*; import java.util.*; import javax.swing.*; import javax.swing.event.*; public class SliderTest { public static void main(String[] args) { SliderTestFrame frame = new SliderTestFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.show(); } } /** A frame with many sliders and a text field to show slider values. */ class SliderTestFrame extends JFrame { public SliderTestFrame() { setTitle("SliderTest"); setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT); sliderPanel = new JPanel(); sliderPanel.setLayout(new FlowLayout(FlowLayout.LEFT)); // common listener for all sliders listener = new ChangeListener() { public void stateChanged(ChangeEvent event) { // update text field when the slider value changes JSlider source = (JSlider)event.getSource(); textField.setText("" + source.getValue()); } }; // add a plain slider JSlider slider = new JSlider(); addSlider(slider, "Plain"); // add a slider with major and minor ticks slider = new JSlider(); slider.setPaintTicks(true); slider.setMajorTickSpacing(20); slider.setMinorTickSpacing(5); addSlider(slider, "Ticks"); // add a slider that snaps to ticks slider = new JSlider(); slider.setPaintTicks(true); slider.setSnapToTicks(true); slider.setMajorTickSpacing(20); slider.setMinorTickSpacing(5); addSlider(slider, "Snap to ticks"); // add a filled slider slider = new JSlider(); slider.setPaintTicks(true); slider.setMajorTickSpacing(20); slider.setMinorTickSpacing(5); slider.putClientProperty("JSlider.isFilled", Boolean.TRUE); addSlider(slider, "Filled"); // add a filled and inverted slider slider = new JSlider(); slider.setPaintTicks(true); slider.setMajorTickSpacing(20); slider.setMinorTickSpacing(5); slider.putClientProperty("JSlider.isFilled", Boolean.TRUE); slider.setInverted(true); addSlider(slider, "Inverted"); // add a slider with numeric labels slider = new JSlider(); slider.setPaintTicks(true); slider.setPaintLabels(true); slider.setMajorTickSpacing(20); slider.setMinorTickSpacing(5); addSlider(slider, "Labels"); // add a slider with alphabetic labels slider = new JSlider(); slider.setPaintLabels(true); slider.setPaintTicks(true); slider.setMajorTickSpacing(20); slider.setMinorTickSpacing(5); Hashtable labelTable = new Hashtable(); labelTable.put(new Integer(0), new JLabel("A")); labelTable.put(new Integer(20), new JLabel("B")); labelTable.put(new Integer(40), new JLabel("C")); labelTable.put(new Integer(60), new JLabel("D")); labelTable.put(new Integer(80), new JLabel("E")); labelTable.put(new Integer(100), new JLabel("F")); slider.setLabelTable(labelTable); addSlider(slider, "Custom labels"); // add a slider with icon labels slider = new JSlider(); slider.setPaintTicks(true); slider.setPaintLabels(true); slider.setSnapToTicks(true); slider.setMajorTickSpacing(20); slider.setMinorTickSpacing(20); labelTable = new Hashtable(); // add card images labelTable.put(new Integer(0), new JLabel(new ImageIcon("nine.gif"))); labelTable.put(new Integer(20), new JLabel(new ImageIcon("ten.gif"))); labelTable.put(new Integer(40), new JLabel(new ImageIcon("jack.gif"))); labelTable.put(new Integer(60), new JLabel(new ImageIcon("queen.gif"))); labelTable.put(new Integer(80), new JLabel(new ImageIcon("king.gif"))); labelTable.put(new Integer(100), new JLabel(new ImageIcon("ace.gif"))); slider.setLabelTable(labelTable); addSlider(slider, "Icon labels"); // add the text field that displays the slider value textField = new JTextField(); Container contentPane = getContentPane(); contentPane.add(sliderPanel, BorderLayout.CENTER); contentPane.add(textField, BorderLayout.SOUTH); } /** Adds a slider to the slider panel and hooks up the listener @param s the slider @param description the slider description */ public void addSlider(JSlider s, String description) { s.addChangeListener(listener); JPanel panel = new JPanel(); panel.add(s); panel.add(new JLabel(description)); sliderPanel.add(panel); } public static final int DEFAULT_WIDTH = 350; public static final int DEFAULT_HEIGHT = 450; private JPanel sliderPanel; private JTextField textField; private ChangeListener listener; }