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| import java.awt.Dimension;
import java.awt.TextArea;
import java.awt.TextComponent;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TestTextArea extends JFrame {
/**
* @param args
*/
public static void main(String[] args) {
new TestTextArea();
}
public TestTextArea() {
setSize(400, 400);
setContentPane(new JPanel());
TextArea textArea=new TextArea();
textArea.setPreferredSize(new Dimension(300,300));
JButton jButton=new JButton("click me to show action");
jButton.addActionListener(new ChangeTextActionListener(textArea));
add(textArea);
add(jButton);
setVisible(true);
}
class ChangeTextActionListener implements ActionListener {
private TextComponent textComponent;
public ChangeTextActionListener(TextComponent textComponent) {
this.textComponent = textComponent;
}
public void actionPerformed(ActionEvent e) {
for (int i=0;i<20;i++) {
textComponent.setText("N"+i);
try {
Thread.sleep(500);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
}
} |
