swt combo监听

以下是使用SWT Combo监听事件的示例代码：

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class ComboListenerExample {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        
        Combo combo = new Combo(shell, SWT.NONE);
        combo.setItems(new String[] {"Option 1", "Option 2", "Option 3"});
        combo.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                Combo selectedCombo = (Combo) e.widget;
                String selectedOption = selectedCombo.getText();
                System.out.println("Selected option: " + selectedOption);
            }
        });
        
        shell.pack();
        shell.open();
        
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        
        display.dispose();
    }
}

这个示例创建了一个SWT Combo对象，并添加了几个选项。然后，通过添加SelectionListener来监听Combo的选择事件。当用户选择一个选项时，会触发widgetSelected方法，并打印所选选项的文本。