嵌套的内部类ABar和BBar可以访问主类的变量吗？例如：

public class Foo {
    public ABar abar = new ABar();
    public BBar bbar = new BBar();
    public int someCounter = 0;

    public class ABar {
        public int i = 0;
        public void someMethod(){
            i++;
            someCounter++;
        }
    }

    public class BBar {
        public void anotherMethod(){
            bbar.someMethod();
            someCounter++;
        }
    }
}
// then called using: //
Foo myFoo = new Foo();
myFoo.bbar.anotherMethod();

编辑

看来我键入的代码会有效,如果我先尝试了它;试图得到帮助,而不是太具体.代码我实际上有麻烦

由于错误“无法使静态引用非静态字段”失败,

public class Engine {
    public Stage stage = new Stage();
        // ...
    public class Renderer implements GLSurfaceView.Renderer {
        // ...
        @Override
        public void onDrawFrame(GL10 gl) {
            stage.alpha++;
        }
    }

    public class Stage extends MovieClip {
        public float alpha = 0f;
    }

解决方法

在你的代码中,是的,这是可能的.

Non-static nested classes (inner classes) have access to other members
of the enclosing class,even if they are declared private. Static
nested classes do not have access to other members of the enclosing
class.

见：Nested Classes