我希望我的按钮"licz":将信息的文本值更改为"加载",执行某些操作并将"info"更改为"完成"。('licz' 在这里是一个 JButton, 'info' JLabel)
licz.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
info.setText("Loading..."); // Here
if(go())
{
brute(0);
info.setText("Done!"); //here
if(odwrot)
JOptionPane.showMessageDialog(frame, "good");
else
JOptionPane.showMessageDialog(frame, "bad");
}
else
{
JOptionPane.showMessageDialog(frame, "bad");
info.setText("Done"); // And here
}
}
});
但是程序先制作"某物",将"信息"标签更改为"加载",然后立即更改为"完成",如何保留这些以防万一?
actionPerforming 的事件在事件处理线程上处理,并且应快速终止以获得响应式 GUI。因此调用invokeLater
.
licz.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
info.setText("Loading...");
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
boolean good = false;
if (go())
{
brute(0);
good = odwrot;
}
JOptionPane.showMessageDialog(frame, good ? "good" : "bad");
info.setText("Done");
}
});
}
});
或者在 java 8 中:
licz.addActionListener((e) -> {
info.setText("Loading...");
EventQueue.invokeLater(() -> {
boolean good = false;
if (go())
{
brute(0);
good = odwrot;
}
JOptionPane.showMessageDialog(frame, good ? "good" : "bad");
info.setText("Done");
});
});