[問題] extends inner class

[sansea (痕天)]

public class Circle {
  class Point {
    public int x = 5, y = 2;
    public Point(int x, int y) {
      this.x = x;
      this.y = y;
    }

    public String toString() {
      return x + ", " + y;
    }
  }
}

public class Test extends Circle.Point {
  public Test() {
    System.out.println(toString());
  }
}

compile的時候出現這個錯誤
Test.java:2: an enclosing instance that contains Circle.Point is required
  public Test() {
                ^
1 error

請問是無法繼承inner class嗎？

新手JAVA首PO
請多指教

--
※ 發信站: 批踢踢實業坊(ptt.cc) 
◆ From: 140.120.210.186
推 Fenikso:Test()的第一行加上 new Circle().super(1, 2);
→ Fenikso:non-static inner class需要一個outer class的instance