Question

java怎么实现在GUI中文字一点一点从上到下的显示

就是有动态的效果那样子的

Answer 1

/**
* 这个是最简单的实现 具体如何匹配 可以在actionListener里重写
* @author Jeky
*/
public class HighlightFrame extends JFrame {

private JButton searchButton;
private JTextArea area;
private JTextField key;

public HighlightFrame() {
key = new JTextField(20);
searchButton = new JButton("search");
searchButton.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
String text = area.getText();
String keyword = key.getText();
int index = text.indexOf(keyword);
if (index != -1) {
try {
while (index != -1) {
area.getHighlighter().addHighlight(index, index + keyword.length(), DefaultHighlighter.DefaultPainter);
index = text.indexOf(keyword, index + keyword.length());
}
} catch (BadLocationException ex) {
ex.printStackTrace();
}
} else {
JOptionPane.showMessageDialog(HighlightFrame.this, "Can't find keyword:" + keyword);
}
}
});
area = new JTextArea("This is a sample of highlighter.\n"
+ "You can enter a keyword and press search button.\n"
+ "Then the word will be highlighted in the text.\n"
+ "\n"
+ "For more information,\n"
+ "you can check javax.swing.text package.");
JPanel north = new JPanel();
north.add(key);
north.add(searchButton);

this.getContentPane().add(new JScrollPane(area));
this.getContentPane().add(north, BorderLayout.NORTH);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(350, 350);
this.setVisible(true);
}

public static void main(String[] args) {
new HighlightFrame();
}
}

Answer 2

用线程来做。

Answer 3

用重绘方法可以啦。呵呵……