Java内部类使用总结(3)

5.面试题public class Outer {
   public void someOuterMethod() {
       // Line 3
    }

   public class Inner {
    }

   public static void main(String[] argv) {
        Outer o= new Outer();
       // Line 8
    }
}

/*
* Which instantiates an instance of Inner?
A. new Inner(); // At line 3
B. new Inner(); // At line 8
C. new o.Inner(); // At line 8
D. new Outer.Inner();    // At line 8
*/

答案A.new Inner();等价于this.new Inner();已经存在一个Outer类对象了.

line 8 正确写法,应为: o.new Inner();