我以为内部类可以访问外部类的变量/方法？

内部类可以通过自己的方法访问外部类的方法和属性。看下面的代码：

class OuterClass {    String a = "A";    String b = "B";    String c = "C";    class InnerClass{        int x;        public String getA(){ return a; // access the variable a from outer class        }    }    public static class StaticInnerClass{        int x;    }    public String stringConCat(){        return a + b + c;        }}public class Test{    public static void main(String args[]) {        OuterClass.StaticInnerClass staticClass = new OuterClass.StaticInnerClass();        OuterClass outer = new OuterClass();        OuterClass.InnerClass inner = outer.new InnerClass();        System.out.println(inner.getA()); // This will print "A"    }}