java - 操作类的非法修饰符错误

Question

我已经获得了实现保存操作的代码，但是当我输入代码时出现错误:

类 saveAction 的修饰符非法；只允许摘要或最终的。

代码:

protected void initialiseActions(){
    // TODO: initalise your actions here 
    public class SaveAction extends AbstractAction{
           public SaveAction(String text, ImageIcon icon, String desc, Integer mnemonic){
               super(text, icon);
               putValue(SHORT_DESCRIPTION, desc);
               putValue(MNEMONIC_KEY, mnemonic);
           }

               public void actionPerformed(ActionEvent e){
                   // Just print out a message for now.
                   System.out.println("Save");
           }
      } 

    Action saveAction = new SaveAction("Save", new ImageIcon("img/save.png"), "Save the image",
             KeyEvent.VK_S);
}   

如有任何帮助，我们将不胜感激。谢谢

Answer 1

您不能声明 public 本地类。删除public标识符。

protected void initialiseActions(){
    // TODO: initalise your actions here 
    class SaveAction extends AbstractAction{
           public SaveAction(String text, ImageIcon icon, String desc, Integer mnemonic){
               super(text, icon);
               putValue(SHORT_DESCRIPTION, desc);
               putValue(MNEMONIC_KEY, mnemonic);
           }

               public void actionPerformed(ActionEvent e){
                   // Just print out a message for now.
                   System.out.println("Save");
           }
      } 

    Action saveAction = new SaveAction("Save", new ImageIcon("img/save.png"), "Save the image",
             KeyEvent.VK_S);
}   

这在 Java Language Specification 中指定

It is a compile-time error if a local class declaration contains any of the access modifiers public, protected, or private (§6.6), or the modifier static (§8.1.1).