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5級

2010-04-26 回答

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

public class Test{

private JFrame frame;

private String scrolledText;

private String str ="滾動文字 Demo";

public static void main(String args[]) {

try{

Test window = new Test();

window.frame.setVisible(true);

}

catch(Exception e){

e.printStackTrace();

}

}

public Test(){

initialize();

}

private void initialize(){

frame.setBounds(100, 100, 500, 375);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JPanel panel = new JPanel();

panel.setBackground(Color.WHITE);

panel.setLayout(new BorderLayout());

frame.getContentPane().add(panel, BorderLayout.NORTH);

final JLabel label = new JLabel();

label.setText("New JLabel");

panel.add(label);

label_scrolledText(label);

frame.addComponentListener(

new ComponentAdapter(){

public void componentResized(ComponentEvent arg0){

label_scrolledText(label);

}

});

}

public void label_scrolledText(JLabel label) {

this.scrolledText = this.str;

label.setText(scrolledText);

FontMetrics metrics = label.getFontMetrics(label.getFont());

int textW = metrics.stringWidth(label.getText());

Dimension frameSize = frame.getSize();

for (int i = 1; i <= (frameSize.width - textW) / 3 - 3; i++)

scrolledText += " ";

label.setText(scrolledText);

Thread thread = new Thread(new TextChanger(label));

thread.start();

}

}

java.lang.NullPointerException

at Test.initialize(Test.java:26)

at Test.(Test.java:23)

at Test.main(Test.java:16)

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