JAVA表单检测更改 [英] JAVA form detect change
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问题描述
我想分别处理事件,在模型视图控制器设计patteren的contexter。
所以,假设我有一个类扩展JFrame。
I want to handle events separately, in the contexte of Model view controller design patteren. So, let's suppose that i have a class extends JFrame.
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.HeadlessException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JSpinner;
import javax.swing.SpinnerNumberModel;
public class Example2 extends JFrame{
private JSpinner spinner1;
private JSpinner spinner2;
private JSpinner spinner3;
private JSpinner spinner4;
private JLabel lbl1;
private JLabel lbl2;
private JLabel lbl3;
private JLabel lbl4;
private JButton button;
public Example2() {
setLayout(new GridBagLayout());
initComponents();
buildFrame();
pack();
}
private void initComponents(){
lbl1 = new JLabel("Number 1:");
lbl2 = new JLabel("Number 2:");
lbl3 = new JLabel("Number 3:");
lbl4 = new JLabel("Number 4:");
button = new JButton("O.K");
spinner1 = new JSpinner(new SpinnerNumberModel(0,Integer.MIN_VALUE, Integer.MAX_VALUE, 1));
spinner2 = new JSpinner(new SpinnerNumberModel(0,Integer.MIN_VALUE, Integer.MAX_VALUE, 1));
spinner3 = new JSpinner(new SpinnerNumberModel(0,Integer.MIN_VALUE, Integer.MAX_VALUE, 1));
spinner4 = new JSpinner(new SpinnerNumberModel(0,Integer.MIN_VALUE, Integer.MAX_VALUE, 1));
button = new JButton("O.K");
}
private void buildFrame(){
GridBagConstraints gc = new GridBagConstraints();
gc.gridx = 0;
// First row
gc.gridy = 0 ;
getContentPane().add(lbl1,gc);
// Next row
gc.gridy++ ;
getContentPane().add(lbl2,gc);
// Next row
gc.gridy++ ;
getContentPane().add(lbl3,gc);
// Next row
gc.gridy++ ;
getContentPane().add(lbl4,gc);
gc.gridy = 0;
gc.gridx = 1;
getContentPane().add(spinner1,gc);
// Next row
gc.gridy++ ;
getContentPane().add(spinner2,gc);
// Next row
gc.gridy++ ;
getContentPane().add(spinner3,gc);
// Next row
gc.gridy++ ;
getContentPane().add(spinner4,gc);
// Next row
gc.gridy++;
gc.gridx = 0 ;
getContentPane().add(button,gc);
}
public static void main(String[] args){
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new Example2().setVisible(true);
}
});
}
}
Is there any way for separate event processing. Sort of making a class witch handles event in Example2 class.Some thing like that.
public class Example2EventsManager {
}
而不是在Example2类中处理事件:
instead of handling events inside Example2 class:
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
System.out.println("processing");
}
});
..........
spinner1.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent ce) {
}
});
etc.
推荐答案
创建一个实现ActionListener接口
Create a class that implements the ActionListener interface
public class MyActionListener implements ActionListener
{
@Override
public void actionPerformed(ActionEvent e)
{
System.out.println(...);
}
}
然后使用类:
button.addActionListener( new MyActionListener() );
如果你想要实现多个接口
If you want you can implement multiple interfaces
public class MyListener implements ActionListener, ChangeListener
...
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