怎么在外部类外访问内部类

在外部类外访问内部类：
Wai.Nei wn=new Wai().new Nei();
上式相当于：Wai w=new Wai(); Wai.Nei wn=w.new Nei();

package a;

class Wai {
	class Nei
	{
		int i=5;
		int ii=6;
	}

}

package a;

public class NeiBuLei {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Wai.Nei wn1=new Wai().new Nei();
		Wai w=new Wai();
		Wai.Nei wn2=w.new Nei();
		System.out.println("内部类中的变量i的值为："+wn1.i);
		System.out.println("内部类中的变量ii的值为："+wn2.ii);
	}
}