您正在引用当前实例的值和不是晚餐课。与任何覆盖一样，您需要引用超类。例如：

You are referencing the current instance''s value and not the supper classes. As in any overriding, you need to reference the super class. For example:

class Foo {
  int val = 1;

  int getVal() {
    return this.val;
  }
}

class Bar extends Foo {
  int val = 2;

  int getFooVal() {
    return super.val;
  }
}

// later on:
Bar b = new Bar();
b.getVal(); // returns 2
b.getFooVal(); // returns 1