我刚开始接触Java中的GUI。例如,我只需要更新一个元素(如
JLabel
)。在Tkinter中,我会使用类似root.update()
或root.update_idletasks()
的函数。我想知道是否有类似的简单函数可以用于使用Swing构建的应用程序。我尝试过gui_element.SetVisible(false)
和gui_element.SetVisible(true)
等类似的方法,但并不成功。我认为使用javax.swing.Timer
可能有效,但不知道具体怎么做。
编辑:这里是代码,请告诉我是否发现其他错误。谢谢。import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
public class sof_sample{
/**
* @param args
*/
private static JFrame frame1 = new JFrame("Fractal Geometry");
public static JButton quit_button = new JButton("Quit");
private static JButton run_button = new JButton("Run");
private static JLabel label1 = new JLabel();
public static JLabel label_iter = new JLabel();
private static GridLayout layout1 = new GridLayout(2,20);
private JOptionPane msg1 = new JOptionPane();
private static int counter;
public static void main(String[] args) {
// TODO Auto-generated method stub
AuxClass1 inst1 = new AuxClass1();
quit_button.addActionListener(inst1);
run_button.addActionListener(inst1);
label1.setText("Iteration");
label1.setVerticalTextPosition(JLabel.CENTER);
label1.setHorizontalAlignment(JLabel.CENTER);
label_iter.setText("0");
label_iter.setBorder(BorderFactory.createLineBorder(Color.BLACK));
label_iter.setVerticalTextPosition(JLabel.CENTER);
label_iter.setHorizontalAlignment(JLabel.CENTER);
//add widgets to the frame
frame1.add(label1);
frame1.add(label_iter);
frame1.add(run_button);
frame1.add(quit_button);
frame1.setLayout(layout1);
frame1.setLocationRelativeTo(null);
//frame1.pack();
frame1.setSize(250, 75);
frame1.setVisible(true);
}
}
class AuxClass1 implements ActionListener{
sof_sample inst2 = new sof_sample();
public void actionPerformed(ActionEvent event1){
if (event1.getSource()==inst2.quit_button){
System.exit(0);
}
else{
for (int i=0;i<20000;i++){
inst2.label_iter.setText(Integer.toString(i));
}
//msg1.showMessageDialog(frame1, "Not yet!");
}
}
}