如何从匿名类中访问封闭的类实例变量？

问题描述

如何从匿名类的方法中访问实例变量？

How do I access instance variables from inside the anonymous class's method ?

class Tester extends JFrame {

   private JButton button;
   private JLabel label;
   //..some more

   public Tester() {
        function(); // CALL FUNCTION
   }

   public void function() {
      Runnable r = new Runnable() {
         @Override
         public void run() {
            // How do I access button and label from here ?
         }
      };
      new Thread(r).start();
   }
}

推荐答案

如果需要，您只需访问它们：

You simply access them if need be:

class Tester extends JFrame {

   private JButton button;
   private JLabel label;
   //..some more

   public Tester() {
        function(); // CALL FUNCTION
   }

   public void function() {
      Runnable r = new Runnable() {
         @Override
         public void run() {
            System.out.println("Button's text is: " + button.getText());
         }
      };
      new Thread(r).start();
   }
}

更重要的是：为什么这不适合你？

More important: Why isn't this working for you?

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